Question:

Which of the following techniques yields a simple random sample

A.

choosing volunteers from an introductory psychology class to participate

B.

listing the individuals by ethnic group and choosing a proportion from within each ethnic group at random

C.

numbering all the elements of a sampling frame and then using a random number table to pick cases from the table

D.

randomly selecting schools, and then sampling everyone within the school

Answer» c. numbering all the elements of a sampling frame and then using a random number table to pick cases from the table

Question:

The _________coefficient (r) is a ratio between the covariance (variance shared by twovariables) and a measure of the separate variances.

A.

regression

B.

elasticity

C.

correlation

D.

mean

Answer» c. correlation

Question:

Which of the following is incorrect

A.

in linear regression a real line is drawn through the data points where total error is minimized.

B.

in linear regression the line tells us by how much y is predicted to change as a result of a change in x.

C.

in linear regression the line fits the data in the best place possible.

D.

in linear regression the line of best fit maximises the distance between the scores and the regression line.

Answer» d. in linear regression the line of best fit maximises the distance between the scores and the regression line.

Question:

The power of a statistical test is defined as,

A.

1−β

B.

1 + β

C.

1

D.

β

Answer» a. 1−β

Question:

Students A,B and C took part in a recent quiz. Student A scored 50 points, Student Bscored 60 points and Student C scored 70 points. What is the mean of this quiz

A.

60

B.

50

C.

70

D.

45

Answer» a. 60

Question:

The ratio of a new price to the base year price is called the:

A.

price absolute

B.

price decrease

C.

price increase

D.

price relative

Answer» d. price relative

Question:

You have a correlation coefficient of 0.45 between two variables. How much variancewould these two variables (to the nearest whole number) share, in percentage terms

A.

16%

B.

67%

C.

25%

D.

20%

Answer» d. 20%

Question:

How is the arithmetic mean related to the variance

A.

variance has the square of the mean in its formula

B.

variance is not related to the mean, but standard deviation is

C.

variance measures the variability of values about the mean

D.

they are not related. one is a measure of central tendency, and the other is a measure of

Answer» c. variance measures the variability of values about the mean

Question:

The movie theater industry tracks ticket sales by age groups. A _______would provide anappropriate representation for the proportion of ticket sales attributed to each age group.

A.

ogive

B.

line graph

C.

scatter diagram

D.

pie chart

Answer» d. pie chart

Question:

The cumulative frequency for a particular class is equal to 35. The cumulative frequency for the next class will be _________________

A.

less than 35

B.

equal to 65

C.

35 minus the next class frequency

D.

35 plus the next class frequency

Answer» d. 35 plus the next class frequency