Question

Asked Dec 9, 2019

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Step 1

**Solution:**

**The sample mean is obtained below:**

From the given information, number of observations is 8 and confidence level is 90%.

The required mean is,

Step 2

**The sample standard deviation is obtained below:**

Step 3

**The critical value is obtained below:**

The level of significance=1-0.90=0.10.

The degrees of freedom= 8-1=7

The critical value is,

From the EXCEL, using the formula, =T.INV.2T(0.10,7), the critical value is...

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