The national sales manager for a textbook publishing company wishes to estimate the mean number of books sold per college. She wishes to have her estimate be within ± 30 copies and wants a 95 percent confidence interval estimate. If a pilot sample of 30 schools gave a sample standard deviation equal to 60 books, the required total sample size is less than the pilot sample already taken. True or False?

It is true that required total sample size is less than the pilot sample already taken.

Step-by-step explanation:

Since we have given that

N = 30

Margin of error = E = 30

Standard deviation = 60

At 95% level of significance,

z = 1.96

So, the value of sample would be

So, it is true that required total sample size is less than the pilot sample already taken.

-4

step-by-step explanation:

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x