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 thefollowing information.tTechnology companies, % foreign revenue: x1; n1 = 1662.855.747.059.655.341.065.151.153.450.848.544.649.461.239.341.8Another 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 = 1728.030.534.250.311.128.818.040.044.940.760.123.121.342.836.928.032.5Assume that the distributions of percentage foreign revenue are mound-shaped and symmetric for these two company types.(a) Use a calculator with mean and standard deviation keys to calculate x,, 51, x2, and s2. (Round your answers to two decimal places.)%(b) Let u, be the population mean for x, and let uz be the population mean for x2. Find a 90% confidence interval for u - H2. (Round your answers to two decimal places.)lower limit%upper limit%

For a large U.S company what percentage of total incomes comes from foreign sales . A random sample…

Answered: a 90% confidence interval

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a 90% confidence interval

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

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Concept explainers

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.

Question

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.t
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
18.0
40.0
44.9
40.7
60.1
23.1
21.3
42.8
36.9
28.0
32.5
Assume that the distributions of percentage foreign revenue are mound-shaped and symmetric for these two company types.
(a) Use a calculator with mean and standard deviation keys to calculate x,, 51, x2, and s2. (Round your answers to two decimal places.)
%
(b) Let u, be the population mean for x, and let uz be the population mean for x2. Find a 90% confidence interval for u - H2. (Round your answers to two decimal places.)
lower limit
%
upper limit
%

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