You are performing a right-tailed test of population mean and the population sta

Question

You are performing a right-tailed test of population mean and the population standard deviation is not known. A sample of size 26 is taken and the sample mean and sample standard deviation are calculated. At a significance level of 0.01, where would you look for the critical test value?

Select one:

A. Z table where 0.99 of the area is to the left of the Z value.

B. Z table where 0.98 of the area is to the left of the Z value.

C. t table where, with 25 degrees of freedom, the column heading is 0.02

D. t table where, with 25 degrees of freedom, the column heading is 0.01

Which of these distributions has a pair of degrees of freedom:

Select one:

A. Normal Distribution

B. Binomial Distribution

C. Poisson Distribution

D. F distribution

Explanation / Answer

Solution :

Given the test is right-tailed .

n = 26

Degrees of freedom = n - 1 = 26 - 1 = 25

Sample standard deviation is given so we use t distrribution .

The the critical test value is to see in the t table where, with 25 degrees of freedom, the column heading is 0.01.

Option D) is correct .

2) F distribution has a pair of degrees of freedom .

Option D) is correct .

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