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Unformatted text preview: A's 20%
earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the
course. Dr Johnson is a new professor teaching "Basic Business Statistics" for the first time
this semester. At the conclusion of the semester, in Dr. Johnson's class of 60 students, there
were 10 A's, 20 B's, 20 C's, 5 D's and 5 W's or F's. Assume that Dr. Johnson's class constitutes
a random sample. Dr Johnson wants to know if there is sufficient evidence to conclude that
the grade distribution of his class is different than the historical grade distribution.
If we assume at
= .05 that the null hypothesis is rejected, make a onesentence managerial
conclusion.
A. Dr. Johnson's class grades don't differ from the historical course grade distribution.
B. Dr. Johnson's class grades are higher than the historical course grade distribution.
C. Dr. Johnson's class grades are Lower than the historical course grade distribution.
D. We cannot draw a conclusion about the difference between Dr. Johnson's grades and the
historical course grade distribution. 11065 Chapter 01  An Introduction to Business Statistics 78. On the most recent tax cut proposal, a random sample of Democrats and Republicans in
the Congress cast their votes as follows: Determine the expected frequencies for both the Democrats and Republicans who favor the
tax cut proposal for the chisquare test of independence.
A. 85, 118
B. 67.3, 67.3
C. 100.5, 102.5
D. 169.2, 234.8 79. On the most recent tax cut proposal, a random sample of Democrats and Republicans in
the Congress cast their votes as follows: Determine the expected frequencies for both the Democrats and Republicans who oppose the
tax cut proposal for the chisquare test of independence.
A. 68.8, 70.2
B. 67.3, 67.3
C. 78, 61
D. 69.5, 69.5 80. At a significance level of .01, determine the appropriate degrees of freedom and the
rejection point condition for this test.
A. 5, 15.1
B. 1, 6.63
C. 6, 16.8
D. 2, 9.21 11066 Chapter 01  An Introduction to Business Statistics 81. On the most recent tax cut proposal, a random sample of Democrats and Republicans in
the Congress cast their votes as follows: Calculate the chisquare statistic for this test of independence.
A. 9.51
B. 9.73
C. 10.33
D. 0.15 82. On the most recent tax cut proposal, a random sample of Democrats and Republicans in
the Congress cast their votes as follows: Use a significance level of .01 and determine if the opinions on the tax cut proposal and the
party affiliation are independent.
A. Reject H0
B. Fail to reject H0 11067 Chapter 01  An Introduction to Business Statistics 83. On the most recent tax cut proposal, a random sample of Democrats and Republicans in
the Congress cast their votes as follows: Suppose, the Chisquare test of independence is performed and the null hypothesis is rejected
that the vote on the issue and party affiliation are independent. Provide a onesentence
interpretation of the outcome of the test.
A. The party affiliation is not independent of the votes on the tax cut proposal.
B. How votes are cast on the tax cut proposal are independent of the party affiliation.
C. Party affiliation does not affect how individuals vote on the tax cut proposal.
D. There is insufficient evidence to determine a correlation between party affiliation and the
congressman's opinion on the tax cut proposal. 84. A human resource manager is interested in whether absences occur during the week with
equal frequency. The manager took a random sample of 100 absences and created the
following table: Calculate the expected absences for all 5 days.
A. 28
B. 20
C. 12
D. 25 11068 Chapter 01  An Introduction to Business Statistics 85. A human resource manager is interested in whether absences occur during the week with
equal frequency. The manager took a random sample of 100 absences and created the
following table: Calculate the value of the chisquare statistic.
A. 6.80
B. 9.49
C. 27.2
D. 1.36 86. A human resource manager is interested in whether absences occur during the week with
equal frequency. The manager took a random sample of 100 absences and created the
following table: How many degrees of freedom are associated with the chisquare test? Use α = .05 and
determine the rejection point condition of the chisquare statistic.
A. 5, 9.49
B. 5, 6.80
C. 4, 9.49
D. 4, 6.80 11069 Chapter 01  An Introduction to Business Statistics 87. A human resource manager is interested in whether absences occur during the week with
equal frequency. The manager took a random sample of 100 absences and created the
following table: At a significance level of .05, test Ho: the probabilities are equal for all five days.
A. Reject H0
B. Fail to reject H0 88. At a recent meeting of educational researchers, comparisons were made between the type
of college freshmen attend and the numbers who drop out. A random sample of freshmen
shows the following results: Determine the expected frequencies for the two cells of 4yr public institutions that will...
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 Winter '14

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