(c) Give a 95% confidence interval, using Table C, for the mean gain of all students who are coached. 23.34 to 34.66 23.06 to 34.94 21.5 to 36.5 20 to 38
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With reference to Exercise 11.8 on page $419,$ construct (a) a $95 \%$ confidence interval for the average course grade of students who make a 35 on the placement test; (b) a $95 \%$ prediction interval for the course grade of a student who made a 35 on the placement test.
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Given that x = 43.5, and o = 14.07, find a 95% confidence interval for the mean score for the population of all fourth graders in the school. A. [37.3,49.7] B. [31.2,55.9] C. [41.9,45.1] D. [40.4,46.6]
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1.Calculate the confidence interval of means at the 95% confidence level Time spent exercising per day Mean = 22 minutes Standard Deviation = 7 minutes N = 55 2.Calculate the confidence interval of proportions at the 99% confidence level. % of Students Who Transfer after 3 years % = 18% N = 120
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