1. A manufacturer of floor mops would like her product to last 700 hours, on the average.She hopes the mean number of hours is not a lot less than 700 (people will not continue to buy her product) or a lot more than 700 (people would seldom have to buy the product). However, the manufacturer has reason to believe the mean may have changed. A random sample of 48 items shows that sample meanX =675andsample standard deviationS =77hours.Usethe significance level =.05.

What is the appropriate test to perform?

a-test about mean, t-test about mean or z-test about proportion

Question 2.

Regarding the hypothesis testing in question 1,what is the appropriatechoice of H_a?

• H_a: 675
• H_a: =700
• H_a: p >.5
• H_a: > 675
• H_a: p .5
• H_a: < 700
• H_a: >700
• H_a: 700

Question 3

what is the value of test statistic?Roundanswer to two decimal places.

Question 4

what is the rejection region?

• [1.64,+)
• (-,-1.64]
• (-,-1.96] U [1.96,+)
• (-,-2.33] U [2.33,+)

This is the hardest topic i've ever learned in school.. like, I'm doing my homework and confused. The teacher's lectures arent helping at all.