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In a random sample of 23 people

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Question

 In a random sample of 23 people, the mean commute time to work was 32.4 minutes and the standard deviation was

7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 90% confidence interval for the population mean μ.
What is the margin of error of μ?
Interpret the results

 
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Find the sample mean.

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Question

 2.2
3.1
2.7
1.9
0.6
4.0
2.1
1.1
3.5
0.4
2.1
3.1 />The grade point averages (GPA) for 12
randomly selected college students are shown. Find the sample mean.

 
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People were polled on how many books they read the previous year

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Question

 People were polled on how many books they read the previous year. How many subjects are needed to estimate the

number of books read the previous year within one book with 99% confidence? Initial survey results indicate that σ=14.1 books

 
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Find the critical value tc for the confidence level

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Question

Find the critical value tc for the confidence level c=0.95 and sample size n=21

 
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