**891. In an experiment the researcher manipulates the ________ variable and measure the ________ variable.****A. independent, dependent**

B. dependent, independent

C. causal, spurious

D. spurious, causal

**892. The more exercise a person takes the fewer medical problems they report. This is an example of:**

A. a curvilinear relationship

B. statistical independence

C. a positive correlation**D. a negative correlation**

**893. In a normal distribution most scores are located:**

A. at the high end of the distribution

B. at the low end of the distribution**C. in the centre of the distribution**

D. at the extremes of the distribution

**894. Data from a correlational study is usually shown as a:****A. scatterplot**

B. pie chart

C. bar graph

D. b or c

**895. A researcher plans to assess intelligence by counting the number of times participants can hop on one leg in 60 seconds. An obvious problem with this is:**

A. lack of statistical validity

B. number of hops is too subjective**C. lack of construct validity**

D. lack of significance

**896. A double-blind study is used to minimize the impact of:**

A. experimenter bias

B. expectancy effects**C. both a and b**

D. neither a nor b

**897. Correlation coefficients range from:****A. r = -1 to r = +1**

B. r = 0 to r = +1

C. r = -1 to r = 0

D. r = +.5 to r = +1

**898. In an experiment randomly assigned, participants drank wine or water. All participants then completed an anxiety questionnaire. In this experiment the IV was:**

A. the results of the memory test

B. the participants

C. the random assignment**D. what the participants drank**

**899. Research shows that the older a person is, the larger their vocabulary. This is an example of a :****A. positive correlation**

B. negative correlation

C. causal correlation

D. partial correlation

**900. Three commonly used measures of central tendency are:**

A. range, standard deviation, median,

B. median, mode, dispersion**C. mode, median, standard deviation**

D. median, mode, mean