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a. Find the 90% confidence interval for the mean SAT-math score for the population of all seniors in the
b. Explain the meaning of the above confidence interval. 3. The effect of exercise on the amount of lactic acid in the blood was examined in an article for an
exercise and sport magazine. Eight males were selected at random from those attending a week-long
training camp. Blood lactate levels were measured before and after playing three games of racquetball,
as shown in the accompanying table. Use this data to estimate the mean increase in blood lactate level
using a 95% confidence interval.
Player 1 2 3 4 5 6 7 8
Before 13 20 17 13 13 16 15 16
18 37 40 35 30 20 33 19 4. A 95% confidence interval for the mean of a population is to be constructed and must be accurate to
within 0.3 unit. A preliminary sample standard deviation is 2.9. Find the he smallest sample size n that
provides the desired accuracy....
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