Question 1

Which of the following sampling methods is a probability sample?
A)Convenience sample
B)Quota sample
C)Stratified sample
D)Judgment sample

Accepted Answer

A stratified sample is a probability sample that involves dividing the population into subgroups and then randomly selecting participants from each subgroup in proportion to their representation in the population. This ensures that every subgroup is represented in the sample, and the results can be generalized to the entire population. The other options (A) Convenience sample, (B) Quota sample, and (D) Judgment sample are all non-probability samples, which means that participants are selected based on some criteria other than random selection, making it difficult to generalize the results to the entire population.

Question 2

The Quality Assurance Department of a large urban hospital is attempting to monitor and evaluate patient satisfaction with hospital services.Prior to discharge,a random sample of patients is asked to fill out a questionnaire to rate such services as medical care,nursing,therapy,laboratory,food,and cleaning.The Quality Assurance Department prepares weekly reports that are presented at the Board of Directors meetings and extraordinary/atypical ratings are easy to flag.True population characteristics estimated from the sample results each week are called
.

Accepted Answer

The answer of The Quality Assurance Department of a large...

Question 3

Which of the following is NOT a reason for selecting a sample?
A)A sample is less time consuming than a census.
B)A sample is less costly to administer than a census.
C)A sample is usually not a good representation of the target population.
D)A sample is less cumbersome and more practical to administer.

Accepted Answer

The statement "A sample is usually not a good representation of the target population" is incorrect. One of the main reasons for selecting a sample is to obtain a representative subset of the target population. The other three choices (A, B, and D) are all valid reasons for selecting a sample.

Question 4

The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products.Which of the following will be a good frame for drawing a sample?
A)Telephone directory.
B)Voting registry.
C)The list of customers who returned the registration card.
D)A list of potential customers purchased from a database marketing company.

Accepted Answer

The list of customers who returned the registration card is the best choice as it consists of actual customers who have purchased the product and are more likely to provide accurate feedback on their satisfaction level. The other options such as telephone directory, voting registry, and a list of potential customers purchased from a database marketing company may not accurately represent the target population of customers who have purchased a Blu-ray player from the company.

Question 5

The British Airways Internet site provides a questionnaire instrument that can be answered electronically.Which of the 4 methods of data collection is involved when people complete the questionnaire?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

Surveying involves collecting data through the use of questionnaires or interviews. In this case, the British Airways Internet site is using a questionnaire instrument to collect data from individuals who complete it electronically.

Question 6

The personnel director at a large company studied the eating habits of the company's employees.The director noted whether employees brought their own lunches to work,ate at the company cafeteria,or went out to lunch.The goal of the study was to improve the food service at the company cafeteria.This type of data collection would best be considered as
A)an observational study.
B)a designed experiment.
C)a random sample.
D)a quota sample.

Accepted Answer

The personnel director is simply observing and recording the eating habits of employees, without manipulating any variables or treatments. This makes it an observational study rather than a designed experiment. Additionally, there is no mention of random or quota sampling, so those options can be eliminated as well.

Question 7

Jared was working on a project to look at global warming and accessed an Internet site where he captured average global surface temperatures from 1866.Which of the four methods of data collection was he using?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

Jared was using published sources as his method of data collection by accessing an Internet site to gather historical temperature data.

Question 8

A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the beaches from environmental disasters.Twenty-five hundred Florida residents were surveyed.What type of data collection procedure was most likely used to collect the data for this study?
A)A designed experiment
B)A published source
C)A random sample
D)Observational data

Accepted Answer

The most likely data collection procedure used for this study is a random sample, where the researchers selected 2,500 Florida residents from a larger population to represent the views of Florida's population as a whole. This type of data collection procedure allows for the most accurate estimates of the population's opinions and attitudes towards the topic being studied. A designed experiment involves manipulating variables to observe their effects, which is not relevant in this study. A published source involves using information from previously published materials, which is not the case here. Observational data involves observing subjects in their natural or intentional context, which is also not applicable in this study.

Question 9

At US Data Corporation's web site,they advertised that "Because of our commitment to quality and our vast amount of industry knowledge and experience,we have grown to be one of America's leading providers of mailing lists,marketing data,sales leads and research data.We maintain databases of information on consumers and businesses nationwide that set industry standards for mission critical currency,reliability and accuracy." Trying to reach 500 potential donors for their annual phone donation campaign,a local fire department purchased a list of donors from the company.This list is an example of a
A)stratified sample
B)systematic sample
C)judgment sample
D)frame

Accepted Answer

The list of donors purchased by the local fire department from US Data Corporation is an example of a frame, which is a list of all the individuals or elements in a target population that can be sampled from. In this case, the target population is potential donors for the annual phone donation campaign, and the frame (list of donors) is used to select a sample of individuals to contact for donations. A stratified sample involves dividing the target population into subgroups and selecting a sample from each subgroup, a systematic sample involves selecting every nth individual from a list, and a judgment sample involves selecting individuals based on the researcher's subjective judgment. None of these sampling methods are mentioned in the scenario, so D is the best answer.

Question 10

The Quality Assurance Department of a large urban hospital is attempting to monitor and evaluate patient satisfaction with hospital services.Prior to discharge,a random sample of patients is asked to fill out a questionnaire to rate such services as medical care,nursing,therapy,laboratory,food,and cleaning.The Quality Assurance Department prepares weekly reports that are presented at the Board of Directors meetings and extraordinary/atypical ratings are easy to flag.Values computed from the sample results each week are called .

Accepted Answer

The answer of The Quality Assurance Department of a large...

Question 11

Which of the following is NOT a reason for the need for sampling?
A)It is usually too costly to study the whole population.
B)It is usually too time consuming to look at the whole population.
C)It is sometimes destructive to observe the entire population.
D)It is always more informative by investigating a sample than the entire population.

Accepted Answer

Option D is not a valid reason for the need for sampling as investigating the entire population can sometimes provide more information than just looking at a sample.

Question 12

The Commissioner of Health in New York State wanted to study malpractice litigation in New York.A sample of 31 thousand medical records was drawn from a population of 2.7 million patients who were discharged during 2010.The proportion of malpractice claims filed from the sample of 31 thousand patients is a .

Accepted Answer

The answer of The Commissioner of Health in New York...

Question 13

The Commissioner of Health in New York State wanted to study malpractice litigation in New York.A sample of 31 thousand medical records was drawn from a population of 2.7 million patients who were discharged during 2010.The true proportion of malpractice claims filed from the population of 2.7 million patients is a .

Accepted Answer

The answer of The Commissioner of Health in New York...

Question 14

Which of the 4 methods of data collection is involved when a person counts the number of cars passing designated locations on the Los Angeles freeway system?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

The method of data collection involved in this scenario is observation, as the person is physically watching the cars and counting them as they pass.

Question 15

Tim was planning for a meeting with his boss to discuss a raise in his annual salary.In preparation,he wanted to use the Consumer Price Index to determine the percentage increase in his real (inflation-adjusted)salary over the last three years.Which of the 4 methods of data collection was involved when he used the Consumer Price Index?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

The Consumer Price Index is a published statistical measure that tracks the price of a basket of goods and services over time to measure changes in the cost of living. Therefore, Tim is using published sources to collect data on inflation.

Question 16

The oranges grown in corporate farms in an agricultural state were damaged by some unknown fungi a few years ago.Suppose the manager of a large farm wanted to study the impact of the fungi on the orange crops daily over a 6-week period.On each day a random sample of orange trees was selected from within a random sample of acres.The daily average number of damaged oranges per tree and the proportion of trees having damaged oranges were calculated.The two main measures calculated each day (i.e. ,average number of damaged oranges per tree and proportion of trees having damaged oranges)are called .

Accepted Answer

The answer of The oranges grown in corporate farms in...

Question 17

A marketing research firm,in conducting a comparative taste test,provided three types of peanut butter to a sample of households randomly selected within the state.Which of the 4 methods of data collection is involved when people are asked to compare the three types of peanut butter?
A)Published sources
B)Experimentation
C)Surveying
D)Observation

Accepted Answer

Experimentation is the method of data collection involved when people are asked to compare the three types of peanut butter. This method involves manipulating an independent variable to observe its effect on a dependent variable. In this case, the independent variable is the type of peanut butter and the dependent variable is the taste preference of the households. By providing different types of peanut butter to the sample, the marketing research firm is manipulating the independent variable and observing the effect on the dependent variable through the taste test.

Question 18

A statistics student found a reference in the campus library that contained the median family incomes for all 50 states.She would report her data as being collected using
A)a designed experiment.
B)observational data.
C)a random sample.
D)a published source.

Accepted Answer

The data was obtained from a published source, indicating it was an observational study rather than a designed experiment or random sample.

Question 19

The oranges grown in corporate farms in an agricultural state were damaged by some unknown fungi a few years ago.Suppose the manager of a large farm wanted to study the impact of the fungi on the orange crops daily over a 6-week period.On each day a random sample of orange trees was selected from within a random sample of acres.The daily average number of damaged oranges per tree and the proportion of trees having damaged oranges were calculated.The two main measures calculated each day (i.e. ,average number of damaged oranges per tree and proportion of trees having damaged oranges)may be used daily to estimate the respective true population .

Accepted Answer

The answer of The oranges grown in corporate farms in...

Question 20

A sample of 300 subscribers to a magazine is selected from a population frame of 9,000 subscribers.If,upon examining the data,it is determined that no subscriber had been selected in the sample more than once,
A)the sample could not have been random.
B)the sample may have been selected without replacement or with replacement.
C)the sample had to have been selected with replacement.
D)the sample had to have been selected without replacement.

Accepted Answer

The sample may have been selected without replacement or with replacement because the question states that no subscriber had been selected in the sample more than once. This means that the sample could have been selected either with or without replacement.

Quiz 1: Defining and Collecting Data

Which of the following sampling methods is a probability sample?

Which of the following is NOT a reason for selecting a sample?

The British Airways Internet site provides a questionnaire instrument that can be answered electronically.Which of the 4 methods of data collection is involved when people complete the questionnaire?

Jared was working on a project to look at global warming and accessed an Internet site where he captured average global surface temperatures from 1866.Which of the four methods of data collection was he using?

Which of the following is NOT a reason for the need for sampling?

Which of the 4 methods of data collection is involved when a person counts the number of cars passing designated locations on the Los Angeles freeway system?

A marketing research firm,in conducting a comparative taste test,provided three types of peanut butter to a sample of households randomly selected within the state.Which of the 4 methods of data collection is involved when people are asked to compare the three types of peanut butter?

A statistics student found a reference in the campus library that contained the median family incomes for all 50 states.She would report her data as being collected using

A sample of 300 subscribers to a magazine is selected from a population frame of 9,000 subscribers.If,upon examining the data,it is determined that no subscriber had been selected in the sample more than once,