The production manager at Bellevue Steel, a manufacture of wheelchairs, wants to
ID: 3252248 • Letter: T
Question
The production manager at Bellevue Steel, a manufacture of wheelchairs, wants to compare the number of defective wheelchairs produced on the day shift with the number on the afternoon shift. A sample of the production from 6 day shifts and 8 afternoon shifts revealed the following number of defects. Day 5 8 7 6 9 7 Afternoon 8 10 7 11 9 12 14 9 At the 0.05 significance level, is there a difference in the mean number of defects per shifts? The sales manager of Copier Sales of America, which has a large sales force throughout the United States and Canada, wants to determine whether there is a relationship between the number of sales calls made in a month and the number of copiers sold that month. The manager selects a random sample of 10 representatives and determines the number of sales calls each representative made last month and the number of copiers sold. compute the correlation coefficient and coefficient of determination.Explanation / Answer
Dear student, I am only answering the first question as per Chegg Guidelines, please ask only one question at a time.
The R code for the work is:
day <- c(5,8,7,9,7)
afternoon <- c(8,10,7,11,9,12,14,9)
t.test(day,afternoon)
The output is:
> t.test(day,afternoon)
Welch Two Sample t-test
data: day and afternoon
t = -2.6907, df = 10.914,
p-value = 0.02113
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
-5.0925577 -0.5074423
sample estimates:
mean of x mean of y
7.2 10.0
Since p-value is less than 0.05, the null hypothesis is not rejected and it is concluded that there is no differnce between the two true means
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