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You are in charge of selling advertising for radio station WQAA.

Question # 00003866
Subject: Statistics
Due on: 11/27/2013
Posted On: 11/21/2013 11:18 PM

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1. You are in charge of selling advertising for radio station WQAA. The fee you can set for airtime is directly related to the share of the listening market your station reaches. From time to time, you conduct surveys to determine WQAA’s share of the market. This month, when you contacted 200 randomly selected residential phone numbers, 12 respondents said they listen to WQAA.
How large a sample size will need to be selected if we wish to be 99% confident of being within 2% of the actual population percentage of the market who are WQAA listeners?
2. Holding goods in inventory is costly because inventoried goods are susceptible to breakage and other forms of physical damage. Typically, the amount of damage increases with the level of inventory, but some of the damage is unrelated to the amount of inventory. In addition, the seasonality may make a difference. A random sample of 10 observations is selected with the variables INVTRY (X1, inventory in $1,000,000s), SEASON (X2, with spring and summer being 0 and fall and winter being 1), and DAMAGE (Y, in $10,000s). The results are found below.

INVTRY SEASON DAMAGE
11 1 80
15 1 100
13 0 70
10 1 60
7 0 50
9 0 70
13 1 100
10 0 65
14 1 95
8 0 54
15 0 96
9 1 91
13 1 85

a. Perform the multiple regression t-tests on, (use two tailed test with (? = .10). Interpret your results.
b. Predict the damage for a single case in the spring or summer with an inventory of $12,000,000. Use both a point estimate and the appropriate interval estimate.

Tags station wqaa radio advertising selling charge damage inventory market selected spring sample goods summer share time wqaa estimate station 1000000s invtry season typically increases variables observations level unrelated seasonality make random difference addition belowinvtryseasondamage111801511001307010160705090701311001006514195805415096919113185a single predict

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You are in charge of selling advertising for radio station WQA

Tutorial # 00003654
Posted On: 11/21/2013 11:20 PM
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Preview: a xxxxxxxxxx evidence xx believe that, xxxxx is an xxxxxxxxxxx between xxx xxxxxxxxx with xxx damage This xxxxxxx there is xx effect xx xxxxxxxxx on xxxxxx On the xxxxx hand, For xxxxxxx hypothesis xxxxxxx xx inventory xxx damage, this xx two tailed xxxxx so xxx xxxxxxx corresponding xx the regression xxxxx (seasonality) with x statistic x xx is x which is xxxx than the xxxxxxxxxx level x xx So, xxx null hypothesis xxxxxx be rejected xx can xx xxxxxxxxx that, xxxxx is no xxxxxxxxxx evidence to xxxxxxx that, xxxxx xx an xxxxxxxxxxx between the xxxxxxxxxxx with the xxxxxx This xxxxxxx xxxxxxxxxxx does xxx influence damage xx In this xxxxx the xxxxxxxx xxxxxxxxxx model xx given as xxxxxxxxxxxxxx = 21 x + x xx Invnty x 11 7 xxxxxxxxxx to find xxx predicted xxxxx xx damage xxx a single xxxx in the xxxxxx or xxxxxx xxxx an xxxxxxxxx of $12,000,000 xxx be interpreted xxxxxxxx Invnty x xx and xxxxxxxxxxx = 0, xxxx the predicted xxxxx of xxxxxx xxx be xxxxxxxx as,Damage = xx 2 + x 49 xxxx x 11 x.....
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