One investigating company tracked all credit card purchase during 2012 and measured two variables: a. the type of credit card used (VISA, MasterCard, American Express, or Discover)
b. the amount (in dollars) of each purchase.

Required:
Identify the level of each variable measured.

People end up tossing 12% of what they buy at the grocery store. assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a. calculate the mean and the standard error for the sample proportion p. b. describe the sampling distribution of p in part a. draw a graph of this probability distribution with its mean and standard deviation. what is the probability that your survey will provide a sample proportion more than 15%? c. d. population proportion? what is the probability that your survey will provide a sample proportion within + 0.03 of the