Asample of 60 items from population 1 has a sample variance of 8 while a sample of 40 items from population 2 has a sample variance of 10. if we test whether the variances of the two populations are equal, the test statistic will have a value of

a. 0.8

b. 1.56

c. 1.5

d. 1.25

 a. 0.8

Step-by-step explanation:

When we test whether the variances of the two populations are equal we use F- test.

Test statistic :

, where = sample variance from population 1.

= sample variance from population 2.

As per given , we have

and  

Then,  If we test whether the variances of the two populations are equal, the test statistic will be

Hence, the test statistic will have a value of 0.8 .

Thus , the correct answer is  a. 0.8 .

21

step-by-step explanation:

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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