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Suppose that we would like to create and interval estimate of the mean value of student’s...

Suppose that we would like to create and interval estimate of the mean value of student’s score on a test. We have the following information about 10 randomly selected students, x⎯⎯=75, and s=9. Assume that the test scores for the population of the students are normally distributed. What critical points should we choose to compute a 90% confidence interval?

a. ±z.05

b. ±z0.1

c. ±t10,.1

d. ±t9,.05

Weights of a newborn baby have a mean of 3000 grams and a standard deviation of 400 grams. What is the probability the average weight of a sample of n=100 is greater than 3030 grams?

a. 0.48

b. 0.23

c. 0.52

d. 0.77

math   Statistics-And-Probability   
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