Q1. John Kleman is the host of the KXYX Radio AM drive-time news in Denver.

During his morning program, John asked listeners to call in and discuss current

local and national news. This morning, john was concerned with the numbers

of hours children under 12 years of age watched TV per day. The last 5 callers

reported that their children watched the following numbers of hours of hours of

TV last night.

3.0 3.5 4.0 4.5 3.0

Would it be reasonable to develop a confidence interval from these data to

show the mean number of hours of TV watched? If yes, construct an

appropriate confidence interval and interpret the result. If no, why would a

confidence interval not be appropriate?

Q.2 A manufacture of cell phone batteries wants to estimate the useful life of it's

battery (in thousand of hours.) The estimate is the be within 0.10 (100) hours.

Assume 1 95 percent level of confidence and that the standard deviation of the

useful life of the battery is 0.90 (900 hours). Determine the required sample size.

Q3.In a sample of 200 residents of Georgetown country, 120 reported they

believe that country real estate taxes were too high. Developed a 95%

confidence interval that proportioned of residents who believe the tax rate

is too high. Would it be reasonable to conclude that the majority of the

taxpayers feel that the text says I too high.

Q A buffalo, your cola distributor is featuring a super-special sale on 12-

packs. She wonders where in the grocery store to place the cola for

maximum attention. Should it be near the front door of the grocery stores.

In the cola section, at the checkout registers, or near the milk and other

dairy products? Four stores, with similar totals sales coopters, or near the

milk and other dairy products?for stores with stacks near the front door, in

another they were placed near the checkout registers, and so on. Sales

were checked at specified times in each store exactly four minutes. The

results were:

Soft Drink

Selection New Registers Dairy Section

$5 $7 $10

10 10 9

12 9 6

4 4 11

9 5 7

The Buffalo distributor wants to find out whether there is a difference in the

mean sales for cola stacked at the four locations in the stores. Use the .05

Significance level