Question

The weights at birth of five randomly chosen baby Orca whales were 425,454,380, 405, and 426 pounds. Assume the distribution of weights is normally distributed. Find a 95% confidence interval for the mean weight of all baby Orca whales and report the margin of error. Round to the nearest tenth of a pound. Use the fact that the sample mean and sample standard deviation are 7=418 and s = 27.49. Question 18 1 pts Arandom sample of 950 adult television viewers showed that 48% planned to watch sporting event X. The margin of error is 4 percentage points with a 95% confidence. Does the confidence interval support the claim that the majority of adult television viewers plan to watch sporting event X? (A) Yes or (B) No. Why? ОА OB

Answer 1

17 ) 95%. c. I Ñ ± 20.95 S. 2 2418, 8=27.49, n=5, 20.45:1.96 un .:: Upper bound : x + 20.95 .418+ 1-96 (27.49) 15 = 442.1 Lower bound - à - Zo.as à - 2o.as un 418 - 196(27-49) 15 - 393.9 (393.9 <ML 442.1) (954.2.1) 18) .: 95). 2.5> (48-47, 48+44) ( 447, 524.) • Yes (as it includes 518 52%)