12. Chris wants to know the changes in the heights of all his friends by comparing their previous average heights. The previous average height was 80. The following is the height before and now. is the mean height significantly different from the mean 80? (Answer with step by step manually, don't use excel or other software) No Previous Now 1 100 104 2 125 130 3 90 110 4 77 96 85 112
12. Chris wants to know the changes in the heights of all his friends by comparing their previous average heights. The previous average height was 80. The following is the height before and now. is the mean height significantly different from the mean 80? (Answer with step by step manually, don't use excel or other software) No Previous Now 1 100 104 2 125 130 3 90 110 4 77 96 85 112
Chapter5: Decimals
Section5.5: Averages And Probability
Problem 400E: The cash register receipts each day last week at a coffee shop were $1,845. $1,520. $1,438, $1,682,...
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Transcribed Image Text:12. Chris wants to know the changes in the heights of all his friends by comparing their
previous average heights. The previous average height was 80. The following is the height
before and now. is the mean height significantly different from the mean 80? (Answer with
step by step manually, don't use excel or other software)
No
Previous
Now
1
100
104
125
130
3
90
110
4
77
96
5
85
112
2.
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