Question

A Gallup poll conducted January 17 - February 6, 2019, asked
1024 teenagers 13 years of age to 17 years of age , “Typically, how
many hours per week do you spend watching TV?’’ The teenagers who
participated in the survey watched, on average, 13.0 hours of
television per week with a standard deviation of 2.3 hours per
week. Construct a 95% confidence interval for the average number of
hours that teenagers watch TV each week

Answer #1

Number of teenagers asked = n = 1024.

Mean = x̄ = 13.0 hours per week

Standard deviation = s = 2.3 hours per week

As sample size is quite large, we will use z-score to find the confidence interval.

z-table :

z score = z = 1.96

Confidence Interval for population mean(µ) is given as -

Therefore, a 95% confidence interval for the average number of hours that teenagers watch TV each week is (12.8591 hours per week, 13.1409 hours per week).

A study conducted a few years ago claims that the adult males
spend an average of 11 hours a week watching sports on television.
A recent sample of 100 adult males showed that the mean time they
spend per week watching sports on television is 9.50 hours with a
standard deviation of 2.2 hours.
a. Use the result to give a 95% confidence interval for the mean
time they spend per week watching sports on television.
a. Does the study...

Delta airlines case study
Global strategy. Describe the current global
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casestudy:
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