eference: Forbes Top Companies.) Assume that the distributions of percentage foreign revenue are mound-shaped and symmetric for these two company types. (a) Calculate x1, s1, x2, and s2. (Use 2 decimal places.) x1 % s1 % x2 % s2 % (b) Let ?1 be the population mean for x1 and let ?2 be the population mean for x2. Find 93% confidence interval for ?1 – ?2. (Use 2 decimal places.) lower limit % upper limit %
eference: Forbes Top Companies.) Assume that the distributions of percentage foreign revenue are mound-shaped and symmetric for these two company types. (a) Calculate x1, s1, x2, and s2. (Use 2 decimal places.) x1 % s1 % x2 % s2 % (b) Let ?1 be the population mean for x1 and let ?2 be the population mean for x2. Find 93% confidence interval for ?1 – ?2. (Use 2 decimal places.) lower limit % upper limit %
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.2: Representing Data
Problem 22PFA
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For large U.S. companies, what percentage of their total income comes from foreign sales? A random sample of technology companies (IBM, Hewlett-Packard, Intel, and others) gave the following information.
Technology companies, % foreign revenue: x1; n1 = 16 | |||||||
62.8 | 55.7 | 47.0 | 59.6 | 55.3 | 41.0 | 65.1 | 51.1 |
53.4 | 50.8 | 48.5 | 44.6 | 49.4 | 61.2 | 39.3 | 41.8 |
Another independent random sample of basic consumer product companies (Goodyear, Sarah Lee, H.J. Heinz, Toys 'R' Us) gave the following information.
Basic consumer product companies,% foreign revenue: x2; n2 = 17 | |||||||
28.0 | 30.5 | 34.2 | 50.3 | 11.1 | 28.8 | 40.0 | 44.9 |
40.7 | 60.1 | 23.1 | 21.3 | 42.8 | 18.0 | 36.9 | 28.0 |
32.5 |
(Reference: Forbes Top Companies.) Assume that the distributions of percentage foreign revenue are mound-shaped and symmetric for these two company types.
(a) Calculate x1, s1, x2, and s2. (Use 2 decimal places.)
(b) Let ?1 be the population mean for x1 and let ?2 be the population mean for x2.
Find 93% confidence interval for ?1 – ?2. (Use 2 decimal places.)
x1 | % |
s1 | % |
x2 | % |
s2 | % |
(b) Let ?1 be the population mean for x1 and let ?2 be the population mean for x2.
Find 93% confidence interval for ?1 – ?2. (Use 2 decimal places.)
lower limit | % |
upper limit | % |
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