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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 -

    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 -

    Thanks!!!!!!!!!

  • STATSHELP -

    Got it thanks!

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