Posted by Megan on .
A poll was conducted that asked 1015 people how many books they had read in the past year. Results indicated that xbar= 12.3 books and s=16.6 books. Construct a 95% confidence interval for the mean number of books people read.
____, _____
PLEASE HELP ME!!!!!!!!!!!!

STATSHELP 
MathGuru,
Formula:
CI95 = mean ± 1.96 (sd/√n)
...where ± 1.96 represents the 95% interval using a ztable, sd = standard deviation, and n = sample size.
n = 1015
mean = 12.3
sd = 16.6
Plug values into the formula and determine the upper bound (+) and lower bound ().
I'll let you take it from here. 
STATSHELP 
Megan,
Thanks!!!!!!!!!

STATSHELP 
Megan,
Got it thanks!