What sample size is needed in given situation

Reference no: EM131427351

Average hours per week on the Internet. Refer to Exercise 8.16. The Student Monitor also reported that the average amount of time spent per week on the Internet was 19.0 hours. You suspect that this amount is far too small for your campus and plan to add this question to your survey.

(a) You feel that a reasonable estimate of the standard deviation is 6.5 hours. What sample size is needed so that the margin of error of your estimate is not larger than 1 hour for 95% confidence?

(b) The distribution of times is likely to be heavily skewed to the right. Do you think that this skewness will invalidate the use of the t confidence interval in this case? Explain your answer.

Reference no: EM131427351

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