The 2015 general Social Survey asked a large number of people how much time they spent watching TV each day. The mean number of hours was 4.2 with a standard deviation of 2.8. Assume that in a sample of 39 teenagers, the sample standard deviation of daily TV time is 2.8 hours, and that the population of TV watching times is normally distributed. Under 10% significance level can you conclude that the population standard deviation of TV watching times for teenagers is less than 2.8?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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The 2015 general Social Survey asked a large number of
people how much time they spent watching TV each day. The
mean number of hours was 4.2 with a standard deviation of
2.8. Assume that in a sample of 39 teenagers, the sample
standard deviation of daily TV time is 2.8 hours, and that the
population of TV watching times is normally distributed.
Under 10% significance level can you conclude that the
population standard deviation of TV watching times for
teenagers is less than 2.8?
Procedure:
Select an answer
Assumptions: (select everything that applies)
Simple random sample
Population standard deviation is unknown
O Sample size is greater than 30
Normal population
Population standard deviation is known
The number of positive and negative responses are
both greater than 10
Transcribed Image Text:The 2015 general Social Survey asked a large number of people how much time they spent watching TV each day. The mean number of hours was 4.2 with a standard deviation of 2.8. Assume that in a sample of 39 teenagers, the sample standard deviation of daily TV time is 2.8 hours, and that the population of TV watching times is normally distributed. Under 10% significance level can you conclude that the population standard deviation of TV watching times for teenagers is less than 2.8? Procedure: Select an answer Assumptions: (select everything that applies) Simple random sample Population standard deviation is unknown O Sample size is greater than 30 Normal population Population standard deviation is known The number of positive and negative responses are both greater than 10
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