Question

Suppose we want to know the average number of hours of sleep each night for all...

Suppose we want to know the average number of hours of sleep each night for all students attending colleges and universities in the US.

We conduct a poll of 2000 students and find the average number of hours of sleep in the sample is 7.2 hours.

Based on this information, we say that we think the nationwide average is between 6.0 to 8.4 hours a night.

a) What is the population parameter µ? Describe in words

b) What is the sample statistic ¯xx¯ ? Describe in words

c) What is the point estimate? Give a number and its units

d) What is the confidence interval? Give numbers with their units

Math   Statistics-And-Probability   
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Answer #1

a)

population parameter µ :

Average number of hours of sleep each night for all students attending colleges and universities in the US. This is unknown and we want to infer it from sample.

b)

sample statistic :

Average number of hours of sleep on the sample of 2000 students.

c)

point estimate:

point estimate of population parameter µ is = 7.2 hours.

d)

confidence interval:

Nationwide average lies in between 6.0 to 8.4 hours a night.

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