Posted by **Megan** on Sunday, May 5, 2013 at 5:42pm.

A poll was conducted that asked 1015 people how many books they had read in the past year. Results indicated that x-bar= 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**, Sunday, May 5, 2013 at 5:50pm
Formula:

CI95 = mean ± 1.96 (sd/√n)

...where ± 1.96 represents the 95% interval using a z-table, 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**, Sunday, May 5, 2013 at 6:00pm
Thanks!!!!!!!!!

- STATSHELP -
**Megan**, Sunday, May 5, 2013 at 6:05pm
Got it thanks!

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