The price of a share of stock divided by the company's estimated future earnings per share...

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The price of a share of stock divided by the company's estimatedfuture earnings per share is called the P/E ratio. High P/E ratiosusually indicate "growth" stocks, or maybe stocks that are simplyoverpriced. Low P/E ratios indicate "value" stocks or bargainstocks. A random sample of 51 of the largest companies in theUnited States gave the following P/E ratios†.
11 35 19 13 15 21 40 18 60 72 9 20
29 53 16 26 21 14 21 27 10 12 47 14
33 14 18 17 20 19 13 25 23 27 5 16
8 49 44 20 27 8 19 12 31 67 51 26
19 18 32
(a) Use a calculator with mean and sample standard deviationkeys to find the sample mean x and sample standard deviations. (Round your answers to one decimal place.)
x =
s =

(b) Find a 90% confidence interval for the P/E population mean ? ofall large U.S. companies. (Round your answers to one decimalplace.)
lower limit
upper limit

(c) Find a 99% confidence interval for the P/E population mean ? ofall large U.S. companies. (Round your answers to one decimalplace.)
lower limit
upper limit

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Values X Xi X 2 11 2009732 35 965012 19 381492 13 1482672 15 1035612 21 174432 40 2197362 18 515022 60 12126762 72 21924402 9 2616792 20 267962 29 146192 53 7741472 16 842082 26 06782 21 174432 14 1249142 21 174432 27 33252 10 See Answer

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11	35	19	13	15	21	40	18	60	72	9	20
29	53	16	26	21	14	21	27	10	12	47	14
33	14	18	17	20	19	13	25	23	27	5	16
8	49	44	20	27	8	19	12	31	67	51	26
19	18	32

11	35	19	13	15	21	40	18	60	72	9	20
29	53	16	26	21	14	21	27	10	12	47	14
33	14	18	17	20	19	13	25	23	27	5	16
8	49	44	20	27	8	19	12	31	67	51	26
19	18	32