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categoryإحصاء schoolبكالوريوس event_available2026-07-13

السؤال

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(1 point) You are interested in estimating μA, the mean monthly rate of return of the stock of Company A listed on the Toronto Stock Exchange. You randomly pick n = 25 months, for each you observe the monthly rate of return of Company A stock. You have observed the following data, in %. 5.58, 2.82, 3.58, 5.46, 6.64, 7.87, 3.91, 4.39, 6.4, 5.37, 7.16, 5.01, 7.78, 5.38, 1.57, 7.32, 2.72, 4.5, 5.99, 3.52, 5.91, 9.04, 9.79, 0.6, 3.53 Data from the sample, are saved in the Download .csv file. (a) Find a 95% confidence interval for μA. Use at least three decimals points for your lower and upper bounds. If computing by hand ensure X and S, are to at least four decimals. lower bound = upper bound = (b) From the from 95% found in (a), can you conclude that the mean monthly rate of return of Company A stock is 8%, or μA = 8%? of the 95% confidence interval is ? ? because the ? ÷ 8%. (c) From the from 95% found in (a), can you conclude that the mean monthly rate of return of Company A stock greater than 5.4%, or PA > 5.4%? ? because the ? of the 95% confidence interval is ? +5.4%.

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