SOLUTION: A distribution of values is normal with a mean of 70 and a standard deviation of 22. From this distribution, you are drawing samples of size 40. Find the interval containing the

Algebra ->  Probability-and-statistics -> SOLUTION: A distribution of values is normal with a mean of 70 and a standard deviation of 22. From this distribution, you are drawing samples of size 40. Find the interval containing the      Log On


   



Question 1153616: A distribution of values is normal with a mean of 70 and a standard deviation of 22. From this distribution, you are drawing samples of size 40.
Find the interval containing the middle-most 90% of sample means:
Enter your answer using interval notation. In this context, either inclusive or exclusive intervals would be acceptable. Your numbers should be accurate to 1 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
this is z=+/- 1.645
the half-interval is 1.645*22/sqrt(40)=+/-5.72
(64.3, 75.7)