BUS 308 Week 2 Quiz

1.

Question :

The one-sample t-test differs from the z-test in which way?

 There are no parameter values involved in a t-test.

 The t-test is more sensitive to minor differences between sample and population.

 With the t-test one can be confident of the normality of the data.

 The t-test requires no <known> parameter standard error of the mean.

Question 2.

Question :

If a certifying agency raises the requirements for real estate agents, what sort of decision error is the agency protecting against?

Student Answer:

 Type I

 Type II

 Type III

 Type IV

Question 3.

Question :

What is the alternate hypothesis in a problem where sales group two is predicted to be “. . . significantly less productive than sales group one?”

Student Answer:

 H_A: μ₁≠ μ ₂

 H_A: μ ₁= μ ₂

 H_A: μ ₁> μ₂

 H_A: μ ₁< μ ₂

Question 4.

Question :

Which of the following defines statistical significance?

Student Answer:

 The outcome is unlikely to have occurred by chance.

 The outcome is important.

The outcome is unusual.

 The outcome is one that can be explained by normal circumstances.

Question 5.

Question :

The standard error of the mean can be calculated by dividing μ by the square root of the number of values in the distribution.

Question 6.

Question :

How does variability in the distribution of sample means compare to variability in a population based on individual scores?

Student Answer:

 Samples tend to vary less than individual scores.

 Samples exaggerate differences among scores.

 Individual scores tend to be more stable over time than samples.

 Sample means vary less than individual scores.

Question 7.

Question :

The z-test can be used to test mean differences even when the initial data set is not normally distributed.

True

False

Question 8.

Question :

What is the advantage of a one-tailed test over a two-tailed test?

Student Answer:

 Less data variability in the groups involved.

 Smaller critical values indicate significance.

 Rejecting at H_O= .05 involves less chance of error.

 There are fewer calculations to make.

Question 9.

Question :

The z- test requires an estimate of the population standard deviation

True

False.

Question 10.

Question :

The standard error of the mean is actually the standard deviation of all of the means that make up the distribution of sample means.

True

False