Question: a. The approximate costs [in 55} for iii-second randomly selected spots for various cable networks in a random selection of cities are shown. 55 53

a. The approximate costs [in 55} for iii-second randomly selected spots for various cable networks in a random selection of cities are shown. 55 53 45 T5 QE- 130 1'2 35 40 56 {i} Using your calculator nd the mean and standard deviation for the above sample. Write your answer correct to two decimal plaoes: HI II [1] .r = [1] (ii) What is the point estimate for the population mean cost for a Bill-second advertisement on cable network? [1] {iii} Assume that the cost for a Bil-second advertisement on cable network are approximately normally distributed. Construct the 90% condence interval for the mean cost of a 3&second advertisement on cable network. Give your answer correct to two decimal places. [3] {iv} Interpret the condence interval obtained from {iii}. [1]

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