Answer Happy

[-/4 Points] DETAILS BBUNDERSTAT12 7.R.014. ASK YOUR TEACHER How profitable are different sectors of the stock market? One way to answer such a question is to examine profit as a percentage of stockholder equity. A random sample of 28 retail stocks such as Toys 'R' Us, Best Buy, and Gap was studied for x₁, profit as a percentage of stockholder equity. The result was x, 13.1. A random sample of 18 utility (gas and electric) stocks such as Boston Edison, Wisconsin Energy, and Texas Utilities was studied for xy, profit as a percentage of stockholder equity. The result was x29.3. Assume that a 4.6 and a = 3.8. (a) Categorize the problem below according to parameter being estimated, proportion p. mean , difference of means , or difference of proportions Pi-P Then solve the problem. OP₁-Pi Ok OP-P ОР lower limit those limit! MY NOTES (b) Let represent the population mean profit as a percentage of stockholder equity for retail stocks, and let y represent the population mean profit as percentage of stockholder equity for utility stocks. Find a 99% confidence interval for p₁- (Use 1 decimal place.) 005 10:12 PM 700/2022
(b) Let , represent the population mean profit as a percentage of stockholder equity for retail stocks, and let y represent the population mean profit as a percentage of stockholder equity for utility stocks. Find a 99% confidence interval for ₁-3. (Use 1 decimal place.) lower limit upper limit (c) Examine the confidence interval and explain what it means in the context of this problem. Does the interval consist of numbers that are all positive? all negative? of different signs? At the 99% level of confidence, does it appear that the profit as a percentage of stockholder equity for retail stocks is higher than that for utility stocks? O Because the interval contains only positive numbers, we can say that the profit as a percentage of stockholder equity is higher for retail stocks. O Because the interval contains both positive and negative numbers, we can not say that the profit as a percentage of stockholder equity is higher for retail stocks. O We can not make any conclusions using this confidence interval. O Because the interval contains only negative numbers, we can say that the profit as a percentage of stockholder equity is higher for utility stocks.