Question 1

According to the Central Limit Theorem, as the number of samples increases, the distribution will approach the normal distribution.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following statistics comparing a sample mean to a population mean is most likely to be significant if you used a two-tailed test?

Accepted Answer

A)  t = 10.6 
B)  t = 0.9 
C)  t = -10.6 
D)  both a and c

Question 3

When we are using a two-tailed hypothesis test, the alternative hypothesis is of the form

Accepted Answer

A)  H 1 : µ ≠ 50. 
B)  H 1 : µ 
C)  H 1 : µ > 50. 
D)  H 0 : µ = 50.

Question 4

The confidence intervals for two separate samples would be expected to differ because

Accepted Answer

A)  the sample means differ. 
B)  the sample standard deviations differ. 
C)  the sample sizes differ. 
D)  all of the above

Question 5

If the population from which we draw samples is "rectangular," then the sampling distribution of the mean will be

Accepted Answer

A)  rectangular. 
B)  normal. 
C)  bimodal. 
D)  more normal than the population.

Question 6

In using a z test for testing a sample mean against a hypothesized population mean, the formula for z is

Accepted Answer

A)   
B)   
C)   
D)  none of the above

Question 7

The standard error of the mean is

Accepted Answer

A)  equal to the standard deviation of the population. 
B)  larger than the standard deviation of the population. 
C)  the standard deviation of the sampling distribution of the mean. 
D)  none of the above

Exam 12: Hypothesis Tests Applied to Means: One Sample