(a) An operator for a telephone-answering service answers a large number of calls for two real estate...
Question:
(a) An operator for a telephone-answering service answers a large number of calls for two real estate agents. The two agents are charged the same monthly fee for this service and it is assumed that they will each receive approximately half the calls coming in. Based on this assumption, find the probability that in the next 150 calls 90 or more will be for one agent. (Use normal approximation of the binomial distribution.)
(b) A recent survey conducted by a Fitness Society found that 60% of Australians who exercise daily by walking are women. If a random sample is taken of 15 people who exercise daily, what is the approximate probability that there will be an exactly 11 females in the group?
(c) A study on online shopping habits found that men spend a mean of $2,401, whereas women spend a mean of $1,527. Suppose that the study was based on a sample of 600 men and 700 females, and the standard deviation of the amount spent was $1,200 for men and $1,000 for women.
At the 0.01 level of significance, is there evidence that the mean amount spent is higher for men than for women?
Canadian Income Taxation planning and decision making
ISBN: 9781259094330
17th edition 2014-2015 version
Authors: Joan Kitunen, William Buckwold