11)An internet provider claims that its download speeds are 35 megabits per seco

Question

11)An internet provider claims that its download speeds are 35 megabits per second. Download speeds were measured 4 times: Test Speed (mbits/s) 1 35.3 2 32.9 3 33.1 4 34.2 Compute the upper bound for the 95% confidence interval for the true mean speed ?. Assume that the data are normally distributed and statistically independent. Round the result to two decimal places.

19)

Suppose 20 accounts were randomly selected from all 1,021 accounts handled by the firm and then audited. The differences between the audit values and the corresponding book values were computed to test the following hypotheses about the true mean difference ? :

If the 95% confidence interval for the true mean difference ? went from -$10 to $60, what do we conclude?

a. Reject H 0 - evidence supports H a

b. Accept H 0 - evidence supports H 0

c. Fail to reject H 0 - not enough evidence to support H a

d. There is no mean difference between audit and book values.

e. Both c and d

Explanation / Answer

Since the confidence interval contains 0, we should not reject null hypothesis

Option-C) Fail to reject H0 - not enough evidence to support Ha

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