Author Question: A z-test for testing hypotheses about a population proportion is to be conducted. True or false: One ... (Read 83 times)

ssal · **on:** Jul 24, 2018

A z-test for testing hypotheses about a population proportion is to be conducted. True or false: One condition for this z-test to be valid is that the sample size is adequately large enough.
a. True
b. False

Question 2

Scores on an English spelling test are determined for a sample of 16 5th graders both before and after they learn some new vocabulary tricks of the trade. In the population of difference scores it is know that students improve with an average of 3 points, with a standard deviation of 4 points, and that the distribution of the differences is approximately normal. What is the probability that the 16 students in the sample do not improve, on average? a
a. < 0.0001
b. 0.0013
c. 0.2266
d. 0.7500