Using techniques from an earlier section, we can find a confidence interval for u Consider a random sample of n matched data pairs A, B. Let d =B- A be a rando variable representing the difference between the values in a matched data pair. Compute the sample meand of the differences and the sample standard deviation s has a normal distribution or is mound-shaped, or if n 30, then a confidence interval for u , is as follows. d-E
Using techniques from an earlier section, we can find a confidence interval for u Consider a random sample of n matched data pairs A, B. Let d =B- A be a rando variable representing the difference between the values in a matched data pair. Compute the sample meand of the differences and the sample standard deviation s has a normal distribution or is mound-shaped, or if n 30, then a confidence interval for u , is as follows. d-E
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Using techniques from an earlier section, we can find a confidence interval for u.
Consider a random sample of n matched data pairs A, B. Let d = B – A be a random
variable representing the difference between the values in a matched data pair. Compute the sample mean d of the differences and the sample standard deviation s. If d
has a normal distribution or is mound-shaped, or if n > 30, then a confidence interval for
is as follows.
3 + p > Pt > 3 – p
where E =
c = confidence level (0 < c < 1)
tc
= critical value for confidence level c and d.f. = n- 1
%3D
B: Percent increase
for company
16 16
16
18
6.
4
21
37
A: Percent increase
24
24
18
14
-4
19
15
30
for CEO
SUSE SALT
(a) Using the data above, find a 95% confidence interval for the mean difference between percentage increase in company revenue and percentage increase in CEO
salary. (Round your answers to two decimal places.)
lower limit
upper limit
(b) Use the confidence interval method of hypothesis testing to test the hypothesis that population mean percentage increase in company revenue is different from that
of CEO salary. Use a 5% level of significance.
O Since u = 0 from the null hypothesis is not in the 95% confidence interval, reject H. at the 5% level of significance. The data indicate a difference in
%3D
population mean percentage increases between company revenue and CEO salaries.
O Since H = 0 from the null hypothesis is in the 95% confidence interval, do not reject H, at the 5% level of significance. The data do not indicate a difference
%3D
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