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It was hypothesized that the number of bottles of an imported premium beer sold in city restaurants depends linearly on the average cost of meals in these restaurants. The following results were obtained for a sample of n =20 restaurants of approximately equal size:
X Mean= 30, Y Mean= 18.8, Variance(X)=412, Cov(x,y)=212
where:
y = Number of bottles of imported premium beer sold, andx = Average cost, in dollars, of a meal.
A) Determine the sample regression line.
B) Interpret the slope of the sample regression line.
C) Is it possible to provide a meaningful interpretation of the intercept of the sample regression line? Explain.
ACT scores of high school seniors. The scores of high school seniors on the ACT college entrance examination in 2003 had mean JL = 20.80 and standard deviation (J = 4.80. The distribution of scores is only roughly Normal.
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Must you assume that the population amount of paint per can is normally distributed here? Explain
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For one of the first statistics exam, the coefficient of determination between hours studied and the grade earned was 80 percent. The standard error of estimate was 10.
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Mention all samples of size 3, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean.
State the null hypothesis and the alternate hypothesis. State the decision regarding the null hypothesis.
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