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Hypothesis Testing: An office manager claims that the mean time required to handle a customer complaint is more than 30 minutes. A sample of 38 complaints shows a mean of 28.7 minutes and standard deviation of 12 minutes. Hi there, the above is the question to my assigment and I am really confused. I see the answer on here given is: H0:μ≤30 H1:μ>30 But, I think we are supposed to use H0: μ = 30 and H1: μ ≠ 30 so it would be μ < 30 or μ > 30. Is this incorrect? or can we do it this way too? Then, we are supposed to find the critical region at 0.05, but I have no idea what to do here. Please could you assist? Ps. we are using z tests.

Hypothesis Testing: An office manager claims that the mean time required to handle a customer complaint is more than 30 minutes. A sample of 38 complaints shows a mean of 28.7 minutes and standard deviation of 12 minutes. Hi there, the above is the question to my assigment and I am really confused. I see the answer on here given is: H0:μ≤30 H1:μ>30 But, I think we are supposed to use H0: μ = 30 and H1: μ ≠ 30 so it would be μ < 30 or μ > 30. Is this incorrect? or can we do it this way too? Then, we are supposed to find the critical region at 0.05, but I have no idea what to do here. Please could you assist? Ps. we are using z tests.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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Hypothesis Testing:

An office manager claims that the mean time required to handle a customer complaint is more than 30 minutes. A sample of 38 complaints shows a mean of 28.7 minutes and standard deviation of 12 minutes.

Hi there, the above is the question to my assigment and I am really confused. I see the answer on here given is:

H0:μ≤30

H1:μ>30

But, I think we are supposed to use H0: μ = 30 and H1: μ ≠ 30 so it would be μ < 30 or μ > 30. Is this incorrect? or can we do it this way too?

Then, we are supposed to find the critical region at 0.05, but I have no idea what to do here. Please could you assist?

Ps. we are using z tests.

Thank you 

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