2. Using summary statistics in question 6, find the 98% confidence interval for the difference of mean fabric strengths for the two types using a pooled interval. Interpret your answer.

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2. Using summary statistics in question 6, find the 98% confidence interval for the difference of mean fabric
strengths for the two types using a pooled interval. Interpret your answer.
Transcribed Image Text:2. Using summary statistics in question 6, find the 98% confidence interval for the difference of mean fabric strengths for the two types using a pooled interval. Interpret your answer.
6. The maintenance cost (y in dollars) and the age of (x in years) of nine cash registers in a department store
is given in the following table.
sum
7
1
3
5
4
2
92
181
23
40
126
35
86
72
51
Xy
a. Complete the above table and find the sum of each row.
b. Draw the scatter plot. Is there a linear trend?
200
150
с.
Find the S, Sw, and Swy.
у 100
50
10
d. Find the Pearson's correlation coefficient.
Transcribed Image Text:6. The maintenance cost (y in dollars) and the age of (x in years) of nine cash registers in a department store is given in the following table. sum 7 1 3 5 4 2 92 181 23 40 126 35 86 72 51 Xy a. Complete the above table and find the sum of each row. b. Draw the scatter plot. Is there a linear trend? 200 150 с. Find the S, Sw, and Swy. у 100 50 10 d. Find the Pearson's correlation coefficient.
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