Question 1

In each of the following statements, determine whether the branch of statistics is best classified as descriptive statistics or inferential statistics.
A. The average of a data set is equal to 35.7.
B. The minimum value of a data set is 78, and the maximum value is 146.
C. Because the average age in a sample is 23, it is likely that the average age in the population is about 23.
D. Because the values in the sample are so widely dispersed, the spread of the population must be high.

Accepted Answer

The answer of In each of the following statements, determine...

Question 2

An investor wants to know today's average closing price of the stocks listed on the Standard and Poor's 500 Index. Will the investor calculate a population parameter or sample statistic? Why?

Accepted Answer

The answer of An investor wants to know today's average...

Question 3

A study of teen smoking is planned. Researchers are interested in collecting cross-sectional data, which allow them to draw conclusions about the likelihood, frequency, and longevity of teen smoking. You have been asked to design this study and will collect no more than five pieces of data. What information will you collect?

Accepted Answer

The answer of A study of teen smoking is planned....

Question 4

A respondent of a survey is asked whether the Philadelphia Flyers' performance in the last game was excellent, good, fair, or poor. The person indicates that the performance was "good." This is an example of
A) nominal data
B) ordinal data
C) interval data
D) ratio data

Accepted Answer

The response "good" represents an opinion or ranking, which is characteristic of ordinal data. Nominal data involves categories with no inherent ranking or order, while interval and ratio data involve numerical values with specific units of measurement.

Question 5

The following data represent a sample of property sales in Cape May County during the year 2000. Identify the qualitative and quantitative variables. What are the natural categories for Town and Class? Identify the measurement scales for all variables.

Accepted Answer

The answer of The following data represent a sample of...

Question 6

Social networking sites support themselves in large part by selling advertising space. The hit rate on these ads is a critical measure when trying to solicit advertising. The hit rate is used as a measure of success for ads. How would you recommend a social networking site use sampling to evaluate its existing ads?

Accepted Answer

The answer of Social networking sites support themselves in large...

Question 7

What are the primary reasons that sampling is necessary?

Accepted Answer

The answer of What are the primary reasons that sampling...

Question 8

A study of teen smoking is planned. Researchers are interested in collecting data which allow them to draw conclusions about the likelihood, frequency, and longevity of teen smoking. The questions asked include: "What is your gender?" "What is your age?" "Do you smoke (yes or no)?" "How many cigarettes per day do you smoke?" "For how long have you smoked (in years)?" What is the measurement scale for each variable?

Accepted Answer

The answer of A study of teen smoking is planned....

Question 9

Define the measurement scale of a car's fuel efficiency (measured in miles per gallon). Is a car's fuel efficiency discrete or continuous?

Accepted Answer

The answer of Define the measurement scale of a car's...

Question 10

Which of the following is an example of qualitative data?
A) Today's high temperature
B) The class average of last test
C) The amount of time you spent for your homework
D) Your last name

Accepted Answer

Qualitative data refers to non-numerical data or data that cannot be measured. Your last name is an example of qualitative data as it cannot be measured in terms of quantity.

Question 11

We would like to determine the average height of the overall student body at Ohio State University. Does it seem necessary to take a sample from the overall student body?

Accepted Answer

The answer of We would like to determine the average...

Question 12

A university is interested in tracking the success of its graduates by measuring the length of each graduate's job search before getting a position in his or her chosen field. How would you define the appropriate population?

Accepted Answer

The answer of A university is interested in tracking the...

Question 13

We would like to determine the average height of a college team of basketball players at Ohio State University. Is it necessary to take a sample of basketball players? Explain.

Accepted Answer

The answer of We would like to determine the average...

Question 14

A car company wants to know the average age of cars of their brand that are still on the road. How would you define the appropriate population? Will the car company calculate a population parameter or a sample statistic? Why?

Accepted Answer

The answer of A car company wants to know the...

Question 15

Researchers are interested in completing a study examining trends in the sale of foods in the U.S. They have decided to examine the quantity of organic vegetables sold by supermarkets. Will researchers be able to gather population data?

Accepted Answer

The answer of Researchers are interested in completing a study...

Question 16

We would like to determine whether there is a difference between the height of a college team of basketball players at the Ohio State University and the height of the overall student body. Identify the two populations in this study.

Accepted Answer

The answer of We would like to determine whether there...

Question 17

Administrators have concluded that the SAT exam results for 2011 show a distinct change in student capabilities when compared with the year 1991. In 1991 the SAT exam included only multiple choice sections and was later redesigned. What is wrong with this conclusion?

Accepted Answer

The answer of Administrators have concluded that the SAT exam...

Question 18

The following table includes the number of white women over the age of 20 in the civilian labor force. Because it is time series data, what would the entries of the first column refer to?  Source: http://data.bls.gov

Accepted Answer

The answer of The following table includes the number of...

Question 19

Philadelphia experienced a record amount of rainfall in August. During the last week of the month, the city received additional rain from a hurricane. Because global warming is thought to cause extreme weather patterns, one conclusion that could be drawn is that these patterns are evidence of global warming. What is wrong with this conclusion?

Accepted Answer

The answer of Philadelphia experienced a record amount of rainfall...

Question 20

Every 10 years, a census is taken in the U.S. by the Census Bureau. Despite the intent of gathering data on the population of the United States, issues exist that make true population data impossible to gather. Identify at least two issues in collecting these data.

Accepted Answer

The answer of Every 10 years, a census is taken...

Quiz 1: Statistics and Data