A problem with a telephone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telephone company. The Sheet 8 contains samples of 20 problems reported to two different offices of a telephone company and the time to clear these problems (in minutes) from the customers' lines: test the Null hypothesis that the time to clear the problem doesn't significantly differ across to centers at the 0.03 level. Sheet 8 Location 1. Location 2 1,48 7,55 1,75 3,75 0,78 12,00 2,85 1,10 0,52 0,60 1,60 0,52 4,15 3,30 3,97 2,10 1,48 0,58 3,10 13,00 1,02 3,75 0,53 0,65 0,93 1,92 1,60 0,60 0,80 1,53 1,05 4,23 6,32 0,08 3,93 1,48 5,45 1,65 0,97 0,72 Select one: a. the Null hypothesis is rejected t_stat < 1.96 b. the Null hypothesis is not rejected -2.29 < t_stat < 2.29 c. the Null hypothesis is not rejected t Critical two-tail > t Critical one-tail d. the Null hypothesis is rejected because p-value > 0.03
A problem with a telephone line that prevents a customer from receiving or making calls is upsetting to both the customer and the telephone company. The Sheet 8 contains samples of 20 problems reported to two different offices of a telephone company and the time to clear these problems (in minutes) from the customers' lines: test the Null hypothesis that the time to clear the problem doesn't significantly differ across to centers at the 0.03 level.
Sheet 8
Location 1. Location 2
1,48 7,55
1,75 3,75
0,78 12,00
2,85 1,10
0,52 0,60
1,60 0,52
4,15 3,30
3,97 2,10
1,48 0,58
3,10 13,00
1,02 3,75
0,53 0,65
0,93 1,92
1,60 0,60
0,80 1,53
1,05 4,23
6,32 0,08
3,93 1,48
5,45 1,65
0,97 0,72
the Null hypothesis is rejected t_stat < 1.96
the Null hypothesis is not rejected -2.29 < t_stat < 2.29
the Null hypothesis is not rejected t Critical two-tail > t Critical one-tail
the Null hypothesis is rejected because p-value > 0.03
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