Question 1

Kit Kat candy bar executives make the following statement: "Our most likely estimate of Kit Kat's ad recall rate is 65%.In addition,we are 95% confident that Kit Kat's ad recall rate in the population falls between 62% and 68%." This illustrates an example of
A)basic descriptive statistics.
B)using statistical inference to estimate a population parameter based upon sample statistics.
C)using statistical inference to estimate a statistic based upon a population parameter.
D)hypothesis testing.
E)Both a and b.

Accepted Answer

The statement mentions a sample statistic (ad recall rate of 65%) and a confidence interval (62% to 68%), which are both examples of statistical inference used to estimate a population parameter (ad recall rate in the population). Therefore, the statement illustrates choice B, which is using statistical inference to estimate a population parameter based upon sample statistics.

Question 2

A histogram is a form of bar chart that is based on information from a frequency count.

Accepted Answer

A histogram represents the distribution of numerical data using bars where the height of each bar represents the frequency count of a particular interval or bin. Therefore, it is based on information from a frequency count.

Question 3

The acceptable level of Type 1 error is usually referred to as the significance level.

Accepted Answer

This is true, the significance level is the probability of making a Type 1 error, and it is often set at 0.05 or 0.01 depending on the specific study and field.

Question 4

A(n)____________________ interval is a projection of the range within which a population parameter will lie at a given level of confidence based on a statistic obtained from an appropriately drawn sample.

Accepted Answer

The answer of A(n)____________________ interval is a projection of the...

Question 5

You can "prove" that the alternative hypothesis is true if the null hypothesis is rejected.

Accepted Answer

The answer of You can "prove" that the alternative hypothesis...

Question 6

The more confidence we want to have in the interval estimate,the larger the sample size should be.

Accepted Answer

This is true because as the sample size increases, the standard error decreases, leading to a narrower interval estimate and higher confidence in the estimate.

Question 7

The logic of hypothesis testing is that if we assume that the hypothesized value is the population parameter,then,at the 95% level of confidence,if we took 100 separate samples,the z-value for 95 of those samples would fall between + or - 1.96.

Accepted Answer

This statement is true. The 95% level of confidence corresponds to a z-value of +/- 1.96 standard deviations from the mean. Therefore, if we assume the hypothesized value is the population parameter, we can use this z-value to test the hypothesis and determine if the sample results are statistically significant. If we were to take 100 separate samples and use this method, we would expect 95 of them to fall within the range of +/- 1.96.

Question 8

The hypothesis that a proposed result is not true for the population is called the ____________________ hypothesis.

Accepted Answer

The answer of The hypothesis that a proposed result is...

Question 9

To test directional hypotheses,you would use a two-tailed test.

Accepted Answer

To test directional hypotheses, we would use a one-tailed test, not a two-tailed test. Two-tailed tests are used to test non-directional hypotheses.

Question 10

An outlier is an observation so different from the rest of the observations that the analyst chooses to treat it as a special case.

Accepted Answer

This statement defines an outlier accurately as an observation that is statistically different enough from the rest of the data to be considered a special case. Therefore, the answer is A - true.

Question 11

Discuss the most commonly used descriptive statistics.

Accepted Answer

The answer of Discuss the most commonly used descriptive statistics....

Question 12

A statistical test to determine whether some observed pattern of frequencies corresponds to an expected pattern is called a chi-square goodness-of-fit test.

Accepted Answer

This statement is true. A chi-square goodness-of-fit test is used to determine if a set of observed frequencies fits a particular expected pattern, such as a universal distribution.

Question 13

A sampling procedure is statistically more efficient than another procedure if,for a given sample size,it results in a larger sampling error.

Accepted Answer

A sampling procedure is statistically more efficient than another procedure if, for a given sample size, it results in a smaller sampling error, not a larger one.

Question 14

The use of the t-statistic in a hypothesis test with two means requires the assumption that it involves two independent samples.

Accepted Answer

The answer of The use of the t-statistic in a...

Question 15

The arithmetic mean value across all responses for a variable is called the ____________________ mean.

Accepted Answer

The answer of The arithmetic mean value across all responses...

Question 16

The ____________________ is a statistical test to determine whether some observed pattern of frequencies corresponds to and expected pattern.

Accepted Answer

The answer of The ____________________ is a statistical test to...

Question 17

An observation so different in magnitude from the rest of the observations that the analyst chooses to treat it as a special case is called a(n)____________________.

Accepted Answer

The answer of An observation so different in magnitude from...

Question 18

In using percentages for reporting results it is reasonable to report percentages to two decimal places.

Accepted Answer

It is generally not necessary to report percentages to more than one decimal place, as this level of precision may not be meaningful or accurate. In most cases, rounding to one decimal place is sufficient.

Question 19

Both nominal and ordinal measures are easily used to group respondents or objects into groups or categories.

Accepted Answer

Nominal and ordinal measures both provide categorical data that can be grouped into categories or levels. Therefore, they are both useful for grouping respondents or objects.

Quiz 19: Data Analysis: Analyzing Individual Variables and Basics of Hypothesis Testing

Kit Kat candy bar executives make the following statement: "Our most likely estimate of Kit Kat's ad recall rate is 65%.In addition,we are 95% confident that Kit Kat's ad recall rate in the population falls between 62% and 68%." This illustrates an example of