## Answers

Solution :

= 17.55

n = 30

This is the two tailed test .

The null and alternative hypothesis is ,

H_{0} : = 17.55

H_{a} : 17.55

df =n-1 = 30-1 = 29

The significance level is α=0.05

and the critical value for a two-tailed test is t_{c}= 2.045

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