MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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ta/2
The sample mean was given to be x = 16.5 customer contacts and the sample standard deviation was given to be s = 4.2 customer contacts for a sample of n = 68 weekly reports. The value of t
determined to be 1.996. All the values are now known to construct the confidence interval.
The lower bound of the confidence interval is calculated using the expression x-ta/2√n Find this lower bound, rounding the result to two decimal places.
lower bound = x-ta/2 √
ta/2 ( √n)
= 16.5 1.996
-
= 15.45
Submit Ski
upper bound = x + tel
-ta/z ( √₁)
n
4.2
S
The upper bound of the confidence interval is calculated using the expression x + ta/2 √
n
= 16.5 1.996
= 17.53
X
4.2
68
Skin (you cannot come back) |
S
√68
X
Therefore, the 95% confidence interval for the population mean number of weekly customer contacts for the sales personnel is from a lower bound of 15.45
17.53
X contacts/week.
Find this upper bound, rounding the result to two decimal places.
was
X contacts/week to an upper bound of
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Transcribed Image Text:ta/2 The sample mean was given to be x = 16.5 customer contacts and the sample standard deviation was given to be s = 4.2 customer contacts for a sample of n = 68 weekly reports. The value of t determined to be 1.996. All the values are now known to construct the confidence interval. The lower bound of the confidence interval is calculated using the expression x-ta/2√n Find this lower bound, rounding the result to two decimal places. lower bound = x-ta/2 √ ta/2 ( √n) = 16.5 1.996 - = 15.45 Submit Ski upper bound = x + tel -ta/z ( √₁) n 4.2 S The upper bound of the confidence interval is calculated using the expression x + ta/2 √ n = 16.5 1.996 = 17.53 X 4.2 68 Skin (you cannot come back) | S √68 X Therefore, the 95% confidence interval for the population mean number of weekly customer contacts for the sales personnel is from a lower bound of 15.45 17.53 X contacts/week. Find this upper bound, rounding the result to two decimal places. was X contacts/week to an upper bound of
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