# Section 7.4 - MATH 2311 Section 7.4 Confidence Interval for...

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Chapter 4 / Exercise 3
Statistics for the Behavioral Sciences
Gravetter/Wallnau
Expert Verified
MATH 2311Section 7.4
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Chapter 4 / Exercise 3
Statistics for the Behavioral Sciences
Gravetter/Wallnau
Expert Verified
Confidence Interval for a Population Mean
So, what is t*?
How do we find critical values for a t-distribution?
Assumptions:
Examples:
Examples:
Look at the following example: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.
Values to cut and paste:assign(“before”,c(13,20,17,13,13,16,15,16))assign(“after”,c(18,37,40,35,30,20,33,19))
t-score table: