Ali asked a random sample of 10 seventh grade boys and 10 seventh grade girls how to spell 10 commonly misspelled words. She recorded whether they spelled each word correctly or not and then recorded the data in a dot plot. How does the IQR for the boys compare to the IQR for the girls?

A.

The IQR for boys is 1 word greater than the IQR for girls.

B.

The IQR for boys is 2 word greater than the IQR for girls.

C.

The IQR for boys is 1 word less than the IQR for girls.

D.

The IQR for boys and the IQR for girls are both equal to 2

Abottled water distributor wants to estimate the amount of water contained in 1-gallon bottles purchased from a nationally known water bottling company. the water bottling company’s specifications state that the standard deviation of the amount of water is equal to 0.02 gallon. a random sample of 50 bottles is selected, and the sample mean amount of water per 1-gallon bottle is 0.995 gallon a. construct a 99% confidence interval estimate for the popula-tion mean amount of water included in a 1-gallon bottle. b. on the basis of these results, do you think that the distributor has a right to complain to the water bottling company? why? c. must you assume that the population amount of water per bottle is normally distributed here? explain. d. construct a 95% confidence interval estimate. how does this change your answer to (b)?