When the GSS asked n = 1050 people in 2012, About how many hours per week do

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When the GSS asked n = 1050 people in 2012, €œAbout how many hours per week do you spend sending and answering e-mail?€ (EMAILHR), the summary statistics were xÌ… = 6.89 and s = 13.05. TI output with these data (available on the book€™s website) is shown in the screen shot.
a. What is the margin of error at the 95% confidence level for the point estimate of the mean number of hours?
b. Interpret the 95% confidence interval shown in context.
c. The distribution of hours spent is right-skewed (e.g., the minimum of zero hours is only 0.5 standard deviations below the mean, but the largest value of 168 hours has a z-score larger than 12). Is this a concern for the validity of the confidence interval?

HORMAL FIX3 AUTO REAL RADIAN CL TInterval (6.100.7.680) X=6.890 Sx=13. 050 n=1050.000

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Statistics The Art And Science Of Learning From Data

ISBN: 9780321997838

4th Edition

Authors: Alan Agresti, Christine A. Franklin, Bernhard Klingenberg

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