Answer:
And we are 9% confidence that the true mean for the difference of the population means is given by:
Step-by-step explanation:
For this problem we have the following data given:
represent the sample mean for one of the departments
represent the sample mean for the other department
represent the sample size for the first group
represent the sample size for the second group
represent the deviation for the first group
represent the deviation for the second group
Confidence interval
The confidence interval for the difference in the true means is given by:
The confidence given is 95% or 9.5, then the significance level is and
. The degrees of freedom are given by:
And the critical value for this case is
And replacing we got:
And we are 9% confidence that the true mean for the difference of the population means is given by:
Answer:
35 Shelves
Step-by-step explanation:
Important Information:
Mystery section 32 books there are 1120 mystery books
[ So 32 Books in each Section ]
Note:
Divide
Question to Answer:
How many shelves will he need to build
Explanation/Solution:
=
35
Hence, He Need to build 35 Shelves.