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Asked Nov 12, 2019

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Step 1

**Note:**

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Step 2

**(a)Rejection region:**

It is given that test is two tailed. α = 0.05, n=14.

Note that the Excel formula **=T.INV.2T (0.05,13)** directly gives the value of the higher critical value,* t*_{0.025} as 2.160. Thus, the rejection region (for rejecting the relevant null hypothesis) is as follows:

Step 3

**(b)Rejection region:**

It is given that test is right tailed. α = 0.10, n=24.

Note that the Excel formula **=T.INV(0.90,23)** directly gives the value of the higher critical value,* t*0.10 as 1.31...

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