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PSTAT 109: Lab 8 Fall 2015 | Complete Solution

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PSTAT 109: Lab 8 Fall 2015


Instructions: When you nish all problems, ask your TA to check your work.
Problem 1 (Compute CI for small sample using t-distribution given sample statistics).
From a population of normally distributed IQ scores, a random sample of 25 scores yields
sample mean as X
= 98:4 and sample deviation Sx = 14:2. Find a 98% con dence interval
for the true mean score of this population. Use Excel's TINV function to obtain your
answer.
Problem 2 (Compute CI using t-distribution given raw data). Standardized test scores are
often found to be normally distributed. The data set below is a random sample of combined
SAT scores from a group of sophomores picked from a random university. Compute the
sample mean, sample deviation and nd a 95% con dence interval for the mean SAT score
of sophomores at this university.
1270 1110 1280 970 720 1350 1070
1220 1220 1020 1210 1170 910 1320
1160 1150 880 1030 1070 1120
950 1440 1080 1020 860 980
1070 850 1200 1400 920 800
Use Excel's TINV function to obtain your answer.
Problem 3 (Compare CI using z-score and t-score). A random sample of size 400 from a
normally distributed population yields X
= 980:5 and Sx = 56:3. Compare the results of
nding a 99% con dence interval for when using z-scores rather than t-scores. Use Excel's
TINV and NORMINV functions to obtain your answer.

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