Straighterline MAT150 Business Statistics Graded Exam 3 (New Version August 2024) Graded 100%
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Straighterline MAT150 Business Statistics Graded Exam 3 (New Version August 2024) Graded 100%
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Question 1
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Question text
A student wanted to construct a 95% confidence interval for the mean age of students in
her statistics class. She randomly selected nine students. Their average age was 19.1 years with
a sample standard deviation of 1.5 years. What is the best point estimate for the population mean?
Select one:
a. 19.1 years
b. 9 years
c. 1.5 years
d. 2.1 years
Question 2
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A sample standard deviation is the best point estimate of the ___________.
Select one:
a. population range
b. population skewness
, c. population standard deviation
d. population mode
Question 3
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Question text
A research firm needs to estimate within 3% the proportion of junior executives leaving large
manufacturing companies within three years. A 0.95 degree of confidence is to be used. Several
years ago, a study revealed that 21% of junior executives left their company within three years. To
update this study, how many junior executives should be surveyed?
Select one:
a. 594
b. 612
c. 897
d. 709
Question 4
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Question text
A group of marketing students at a large university wants to determine the proportion of first year
students who use certain types of social media. The students want their estimate to be within 0.03 of
the true proportion with a 90% level of confidence. How large of a sample is required if
the population proportion is not known?
Select one:
a. Cannot be determined without more information
b. 347
c. 1,068
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