Question

Management claims the mean income for all senior-level assembly line workers at 3M equals $700 a week. An employee decided to test this claim believing it is different from $700.

**A.** State the hypotheses for this test, and make
a conclusion to the test based upon the confidence interval below.
What level is this test? 99% CI of µ: (631.354, 650.868)

**B.** Suppose management claimed that 60% of
senior-level assembly line workers at 3M is greater than $650 a
week. An employee created a 95% confidence interval of the
proportion of senior-level assembly line workers using a random
sample of 50 workers. Their confidence interval is below. Based off
the confidence interval, is it valid to conclude that less than 60%
of workers get paid more than $650 a week? Why or why not?(Hint:
what is the standard error of a z-test and what is the standard
error of a confidence interval for proportions?) 95% CI for p:
(0.522,0.776)

Answer #1

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