Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams.

-Refer to Exhibit 12.6. The conclusion is:

Accepted Answer

A)  The mean weight of a field mouse is greater than 235 grams. 
B)  The mean weight of a field mouse is less than 235 grams. 
C)  Estimate a point mean of 235 grams. 
D)  The mean weight of a field mouse is less than 225 grams. 
E)  None of the above are correct.

Question 3

A research study that tests the hypothesis, "The population mean household income in the new market area is greater than $29,000," will involve a:

Accepted Answer

A)  test of two means. 
B)  test for a single mean. 
C)  test for a single proportion. 
D)  test of two proportions. 
E)  test of a single variance.

Question 4

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams.

-Refer to Exhibit 12.6. What is the estimated standard error of the mean?

Accepted Answer

A) 0.173 grams 
B) 1.15 grams 
C) 1.38 grams 
D) 15.8 grams 
E) 17.3 grams

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

-Refer to Exhibit 12.2. What is the average number of televisions per household?

Accepted Answer

A) 2.00 
B) 1.85 
C) 1.52 
D) 2.25 
E) 2.74

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams.

-Refer to Exhibit 12.6. What is the value of the test statistic for the hypothesis that the actual mean weight of the mouse population is greater than 235 grams?

Accepted Answer

A)  -0.578 
B)  -2.79 
C)  -0.633 
D)  -6.33 
E)  -7.25

Question 10

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) True 
 B)False

Question 11

For which of the following types of measures does the mean NOT provide a meaningful value?

Accepted Answer

A)  Ratio 
B)  Equal-interval scales 
C)  Interval 
D)  Ordinal 
E)  Continuous measures

Question 12

Which statement(s) pertaining to the chi-square distribution is FALSE?

Accepted Answer

A)  The chi-square distribution is completely determined by its degrees of freedom. 
B)  The variable of interest is broken into k mutually exclusive categories. 
C)  The expected number falling into a category is generated from the null hypothesis. 
D)  Chi-square degrees of freedom is given by k - 2. 
E)  The chi-square is appropriate for independent trials.

Question 13

An observation that is very different in magnitude from the rest of the observations for a particular variable is a(n):

Accepted Answer

A)  error. 
B)  blunder. 
C)  histogram. 
D)  outlier. 
E)  deviant.

Question 14

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams.

-Refer to Exhibit 12.5. The degrees of freedom would equal:

Accepted Answer

A) 14. 
B) 24. 
C) 219. 
D) 199. 
E)  Cannot tell from the given information.

Question 15

The FactFinder Research firm conducted a survey for a national food manufacturer and one of the issues addressed by the research was to determine how many pounds of fish were annually consumed per capita. In the survey they found one person who consumed only one pound of fish per year while 10 people reported 200 pounds per year. The range was:

Accepted Answer

A) 200. 
B)  1 to 2,000. 
C) 201 
D) 199. 
E)  None of the above.

Question 16

Which type of statistical analysis would we use to determine if female college graduates' starting salary was different from their male counterpart (assuming data is collected using the following question on the survey "What is your starting salary?"

Accepted Answer

A)  Test of two means. 
B)  Test for a single mean. 
C)  Test for a single proportion. 
D)  Test of two proportions. 
E)  Test of a single variance

Question 17

-Refer to Exhibit 12.2. What is the sample standard deviation?

Accepted Answer

A) 0.4318 
B) 0.3246 
C) 0.6571 
D) 1.0239 
E)  Can't be determined from the table.

Question 18

If the standard deviation of household income for a sample of 625 households is $8,000, what is the standard error of the mean?

Accepted Answer

A)  $320 
B)  $625 
C)  $8,000 
D)  $80 
E)  $25

Question 19

Which of the following would be an appropriate interpretation of a p-value?

Accepted Answer

A)  A p-value of p < 0.0001 is 'highly significant' and therefore much more valid than a p value of 0.05. 
B)  When a null hypothesis is rejected at some predetermined p level, sampling error is an unlikely explanation of the results, given that the null hypothesis is true. 
C)  When a p-value shows significance, managerial and practical significance can be assumed. 
D)  The probability that the research hypothesis is true is equal to 1 minus the p-value. 
E)  A p-value represents the probability that the results occurred because of sampling error.

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 12: Analysis & Interpretation: Individual Variables Independently

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

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams. -Refer to Exhibit 12.6. The conclusion is:

A research study that tests the hypothesis, "The population mean household income in the new market area is greater than $29,000," will involve a:

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams. -Refer to Exhibit 12.6. What is the estimated standard error of the mean?

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

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

-Refer to Exhibit 12.2. What is the average number of televisions per household?

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

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams. -Refer to Exhibit 12.6. What is the value of the test statistic for the hypothesis that the actual mean weight of the mouse population is greater than 235 grams?

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

For which of the following types of measures does the mean NOT provide a meaningful value?

Which statement(s) pertaining to the chi-square distribution is FALSE?

An observation that is very different in magnitude from the rest of the observations for a particular variable is a(n) :

120 field mice are weighed. The average weight of a mouse is 225 grams and the sample standard deviation is 15.1 grams. -Refer to Exhibit 12.5. The degrees of freedom would equal:

Which type of statistical analysis would we use to determine if female college graduates' starting salary was different from their male counterpart (assuming data is collected using the following question on the survey "What is your starting salary?"

-Refer to Exhibit 12.2. What is the sample standard deviation?

If the standard deviation of household income for a sample of 625 households is $8,000, what is the standard error of the mean?

Which of the following would be an appropriate interpretation of a p-value?

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