If a study is testing for the difference between 9 populatio

If a study is testing for the difference between 9 population means by taking samples of size 15 out of each one of the populations:

Select one:

a. The numerator degrees of freedom would be 10

b. The p-value would be approaching zero

c. The denominator degrees of freedom would be 126

d. The total degrees of freedom would be 135

For the following sample data: Means: 5; 5.5; 5.25 Variances: 3.23; 3.11; 3.08 Sample size: 10; 10; 10 What is the value of the test statistic (round to the nearest decimal)?

Select one:

a. .20

b. .06

c. 4.2

d. 26.45

When testing for the difference between two population means, which one of the following is NOT an essential piece of information to know to conduct the test?

Select one:

a. The sample size

b. Whether the population standard deviation is known or not

c. Exactly what the two population means are

d. All of the above are essential pieces of information

Solution

SWe use one way ANOVA for testing the means.

So, the sample size is

between groups is 8

within group is   126

So, the answer is c.

The denominator degrees of freedom would be 126

For this the answer is c.

4.2

When testing for the difference between two population means, first we have the sample size

second t\\what the two population means and third is the population standard deviation is known or not for apply the t-test and z-test.

So. answer is d.