Number of Hours Worked An economic researcher is collecting data about grocery store employees in a county. The data listed below represents a random sample of number of hours worked by 40 employees for several grocery stores in the county. Assume that the population standard deviation is 7.9 hours. An economics researcher wants to estimate the mean number of hours worked by all grocery store employees in the county. How many employees must be included in the sample to be 95% confident that the sample mean is within 1.5 hours of the population mean? 30, 26, 33, 26, 26, 33, 31, 31, 21, 37, 27, 20, 34, 35, 30, 24, 38, 34, 39, 31, 22, 30, 23, 23, 31, 44, 31, 33, 33, 26, 27, 28, 25, 35, 23, ,32, 29, 31, 25, 27

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omeb... Kaiser Permanent...
/courses/27422/discussion_topics/357765
F2
W
Instructions
30F
Required parameters:
Confidence level:
F
#3
0.95
Standard deviation: 7.9
E
Number of Hours Worked
An economic researcher is collecting data about grocery store employees in a county. The data listed below represents a random sample of number of
hours worked by 40 employees for several grocery stores in the county. Assume that the population standard deviation is 7.9 hours. An economics
researcher wants to estimate the mean number of hours worked by all grocery store employees in the county. How many employees must be included
in the sample to be 95% confident that the sample mean is within 1.5 hours of the population mean?
30, 26, 33, 26, 26, 33, 31, 31, 21, 37, 27, 20, 34, 35, 30, 24, 38, 34, 39, 31, 22, 30, 23, 23, 31, 44, 31, 33, 33, 26, 27, 28, 25, 35, 23, ,32, 29, 31, 25, 27
Find the minimum sample size to estimate the population mean hours worked using StatCrunch.
1. Enter data in StatCrunch.
2. Click the menu sequence Stat → Z Stats
One Sample →→ Power/Sample Size.
3. In the window that displays, click the Confidence Interval Width button.
4. In the Required parameters section:
80
F3
C
F
$
o In the Confidence level box, type 0.95.
o In the Standard deviation box, type 7.9
5. In the Enter One section, in the Width box, type 3 (which is the tolerable error E of 1.5, multiplied by 2).
4
F MO 3
W HIGH TOPS-... Translate
F4
R
Enter one:
Width:
Sample size:
Compute
6. Copy and paste the Confidence Interval Width window with sample size found.
7. Interpret, in words, the meaning of the sample size value just computed.
Reply to Peers
Come back to view everyone's contribution and leave a comment for at least 1 peer. If you can jump in and answer a question or leave a feedback for a
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Transcribed Image Text:omeb... Kaiser Permanent... /courses/27422/discussion_topics/357765 F2 W Instructions 30F Required parameters: Confidence level: F #3 0.95 Standard deviation: 7.9 E Number of Hours Worked An economic researcher is collecting data about grocery store employees in a county. The data listed below represents a random sample of number of hours worked by 40 employees for several grocery stores in the county. Assume that the population standard deviation is 7.9 hours. An economics researcher wants to estimate the mean number of hours worked by all grocery store employees in the county. How many employees must be included in the sample to be 95% confident that the sample mean is within 1.5 hours of the population mean? 30, 26, 33, 26, 26, 33, 31, 31, 21, 37, 27, 20, 34, 35, 30, 24, 38, 34, 39, 31, 22, 30, 23, 23, 31, 44, 31, 33, 33, 26, 27, 28, 25, 35, 23, ,32, 29, 31, 25, 27 Find the minimum sample size to estimate the population mean hours worked using StatCrunch. 1. Enter data in StatCrunch. 2. Click the menu sequence Stat → Z Stats One Sample →→ Power/Sample Size. 3. In the window that displays, click the Confidence Interval Width button. 4. In the Required parameters section: 80 F3 C F $ o In the Confidence level box, type 0.95. o In the Standard deviation box, type 7.9 5. In the Enter One section, in the Width box, type 3 (which is the tolerable error E of 1.5, multiplied by 2). 4 F MO 3 W HIGH TOPS-... Translate F4 R Enter one: Width: Sample size: Compute 6. Copy and paste the Confidence Interval Width window with sample size found. 7. Interpret, in words, the meaning of the sample size value just computed. Reply to Peers Come back to view everyone's contribution and leave a comment for at least 1 peer. If you can jump in and answer a question or leave a feedback for a peer, please do! % DE LO 5 오 ->>>> T G 3 > 6 F6 Y H ae G☆ car payment Login P Pearson Sign In H Honda Financial S... & 7 а BE U J 8 T DII F8 @BO ( K F9 O L 7 F10 HD P GO ») * = 0 F11 X □ + + 11 F12 } 1 Other Bo O Up delete
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