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In exercise 1-4, find critical value tc for given confidence level cand sample size n.

1. C=0.90, N=10

3. C=0.99, N=16

iN EXERCISE 5-8 FIND MARGIN OF ERROR FOR GIVEN VALUES C,S and N

5. C=0.95 S=5 N=16

7. C=0.90 S=2.4 N=12

in erercise 17-18 your given sample mean and deviation. assume normally distributed use t-distribution to find margin of error and construct 95% confidence interval for population mean. interpret results

17. commute time to work: random sample 8 people the mean commute time 35.5 min andample deviation 7.2 min.

18. driving distance to work: random sample 5 people the mean driving distance 22.2 miles and sample deviation was 5.8 miles.

constructing confidence intervals: find sample mean, deviation and construct 99% confidence interval for population mean.

The annual earnings 16 random selected computer software

23. 92,184 86,919 90,176 91,740 95,535 90,108 94,815 88,114

      85,406 90,197 89,944 93,950 84,116 96,054 85,119 88,549