1) According to a statistics agency, 8.7% of families in a large country have five or more members. Suppose that a random sample of 550 rural farm families is taken, and it is found that 17.5% of those families have five or more members. Is this a very unusual result? Would you conclude that farm families differ from other families in the country? Why? What is the Z score for p^ = 0.175 ? 2) An investment website can tell what devices are used to access their site. The site managers wonder whether they should enhance the facilities for trading via smartphones so they want to estimate the proportion of users who access the site that way. They draw a random sample of 263 investors from their customers. Suppose that the true proportion of smartphone users is 29%. What would be the mean of this is sampling distribution ? 3) The Canadian Veterinary Medical Association claims that the annual cost of medical care for dogs averages $85 with a standard deviation of $33 and for cats averages $105 with a standard deviation of $40. Complete parts : 1) if the difference in cost can be described by the normal model, what is the probability medical expenses are expensive for someone's dog over cat