q28 Suppose you want to estimate the percentage of all American families planning a vacation for the summer. Your confidence interval is 30% to 40%. You can find the value of

True

False

q29 Suppose the age of the customers at post office has a non-normal distribution with mean40 and standard deviation 5 years. What is the chance that the average age for 100 customers from the post office is over 41?

0.4207

0.5793

None of the above / cannot tell based on the information given

0.0228