Arandom sample of 25 values is drawn from a mound-shaped and symmetric distribution. the sample mean is 14 and the sample standard deviation is 2. use a level of significance of 0.05 to conduct a two-tailed test of the claim that the population mean is 13.5. (a) is it appropriate to use a student's t distribution? explain.

24

Step-by-step explanation:

n = 25, , S = 2,  α= 0.05, μ= 9.5

a) Yes, We can use student t-test.

Here, Population standard deviation (σ) is Unknown, So we can Use student t-test.

Degrees of Freedom = n-1 = 25-1=24

it could 14.28 but if its not that one then it has to be the 17 one. hope this ! : )

step-by-step explanation:

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