A company claims that the course they offer significantly increases the writing speed of secretaries. The following table gives the scores of eight secretaries before and after the attended this course. 81 97 75 72 65 | 90 70 69 78 | 115 | 75 69 Before After 89 93 91 110 Make a 90 % confidence interval for the mean 4x – Hy of the population paired differences, where a paired differences is equal to the score before attending the course minus the score after attending the course.

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A company claims that the course they offer significantly increases the writing speed of
secretaries. The following table gives the scores of eight secretaries before and after they
attended this course.
Before
After
81
75
89
91
65
70
90
69
97
72
93
110
78
69
115 | 75
Make a 90 % confidence interval for the mean Ax -Hy of the population
paired differences, where a paired differences is equal to the score before attending the
course minus the score after attending the course.
Transcribed Image Text:A company claims that the course they offer significantly increases the writing speed of secretaries. The following table gives the scores of eight secretaries before and after they attended this course. Before After 81 75 89 91 65 70 90 69 97 72 93 110 78 69 115 | 75 Make a 90 % confidence interval for the mean Ax -Hy of the population paired differences, where a paired differences is equal to the score before attending the course minus the score after attending the course.
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