Although the Occupational Safety and Health Act (OSHA) is not very popular with management because it is expensive to implement, some sources claim that it has been effective in reducing industrial accidents. The following data were collected on last time

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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d
E
80
F3
Page < 2
of 2
2. Although the Occupational Safety and Health Act (OSHA) is not very popular with
management because it is expensive to implement, some sources claim that it
has been effective in reducing industrial accidents. The following data were
collected on lost-time accidents both before and after OSHA came into effect (the
figures given are mean man-hours lost per month over a one year period) at six
different industrial plants:
Plant
1
2
3
4
5
6
38
64
42
70
58
30
Before OSHA
After OSHA
31
58
43
65
52
29
Difference (B-A)
a. A test is to be performed to see if OSHA has been effective in reducing
the industrial accidents. Differences are calculated as "Before - After".
Enter those differences in the table.
b. What was the average reduction in man-hours lost per month in the
sample?
c. The population of differences has a normal distribution. The sample
standard deviation equals 3.225 hours. Test the claim that OSHA has
been effective in reducing the average number of man-hours lost per
month using a 0.05 significance level.
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Transcribed Image Text:d E 80 F3 Page < 2 of 2 2. Although the Occupational Safety and Health Act (OSHA) is not very popular with management because it is expensive to implement, some sources claim that it has been effective in reducing industrial accidents. The following data were collected on lost-time accidents both before and after OSHA came into effect (the figures given are mean man-hours lost per month over a one year period) at six different industrial plants: Plant 1 2 3 4 5 6 38 64 42 70 58 30 Before OSHA After OSHA 31 58 43 65 52 29 Difference (B-A) a. A test is to be performed to see if OSHA has been effective in reducing the industrial accidents. Differences are calculated as "Before - After". Enter those differences in the table. b. What was the average reduction in man-hours lost per month in the sample? c. The population of differences has a normal distribution. The sample standard deviation equals 3.225 hours. Test the claim that OSHA has been effective in reducing the average number of man-hours lost per month using a 0.05 significance level. MacBook Air Q C DD F6 F9 $ 4 F4 R % 5 9 F5 T < 6 Y & 7 8 F7 U * 0 8 DII F8 I ( 9 0 0 A F10 P c
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