1. In a certain course, the placement exam given the first day of instruction was administered to the same students on the last day of instruction. Which type of two-sample technique should be used to determine whether the students improved during the course?

a.inferences about two means, independent samplesb.inferences about two means, matched pairs

b.inferences about two means, matched pairs

c.inferences about two proportionsd.inferences about twovariances

d.inferences about two variances

e.inferences about two standard deviations

2. When the P-value for a test of hypothesis is smaller than the level of significance, the

proper conclusion

a.is to rejectH0and say there is enough evidence to conclude H1

b.is to rejectH0and say there is not enough evidence to conclude thatH0istrue

c.is to fail to rejectH0and conclude thatH0is true

d.is to fail to rejectH0and say there is enough evidence to conclude H1

e.None of above.

3. We use the sample proportionpto estimate for the population proportionp.Thenpis

properly called thea.estimator

a.estimator

b.point estimate

c.critical value

d.level of confidencee.margin of error.

f.None of above.

1. When you reject the null hypothesis in a two-tailed test at the 2% level of significance, the probability you are making a type I error is
2. a. 0.05b. 0.04 c. 0.02 d. 0.01

1. To estimate for a population, mean, one uses a randomly selected sample of size 24. Assume that the population is normally distributed with the population standard deviation of 5.3. Which distribution can be used to estimate for the population mean?
2. A standard normal distribution
3. A normal distribution
4. A t-student distribution
5. A chi-square distribution
6. None of other answers is necessary true.