Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 23

Marketing Photography Does the kid factor make a difference If you are talking photography, the answer may be yes! The following table is based on information from American demographics (vol. 19, No. 7).

Let us say you are a market research person who interviews a random sample of 10 households.
(a) Suppose you interview 10 households with children under the age of 2 years. Let r represent the number of such households that buy photo gear. Make a histogram showing the probability distribution of r for r = 0 through r = 10. Find the mean and standard deviation of this probability distribution.
(b) Suppose that the 10 households are chosen in have no children under 21 years old. Let r represent the number of such households that buy photo gear. Make a histogram showing the probability distribution of r for r = 0 through r = 10. Find the mean and standard deviation of this probability distribution.
(c) Interpretation Compare the distributions in parts (a) and (b). You are designing TV ads to sell photo gear. Could you justify featuring ads of parents taking pictures of toddlers Explain your answer.