The Excel output in Figure 3 below was generated using a sig

The Excel output in Figure 3 below was generated using a significance level of .01. The difference between the two sample means, (34.62 - 39.60) = -4.98, is best interpreted by which of the following?

Figure 3: Comparing average customer age between Internet providers A and B

Select one:

a. The difference between the two unknown population parameters is likely -4.98.

b. The difference between the two sample means indicates a one-tail test is more appropriate than a two-tail test.

c. The difference between the two sample means is 3.44 standard errors below the predicted difference of zero.

d. The difference between the two sample means is 4.98 standard errors below the predicted difference of zero.

Using Figure 3, with a two-tail test what would you conclude using a significance level of .01?

Select one:

a. The average customer age is different for both providers

b. The average customer age is equal for both providers

c. More information is required to make a conclusion

Using Figure 3, make a conclusion to the following hypothesis test at the .01 significance level:

Select one:

a. Reject the null hypothesis

b. Fail to reject the null hypothesis

c. More information is required to make a conclusion

Solution

b. The difference between the two sample means indicates a one-tail test is more appropriate than a two-tail test.

b. The average customer age is equal for both providers.

c. More information is required to make a conclusion.