Given a correlation coefficient of zero, which conclusion is correct?

a.There is no relationship between the variables.

b.Cannot be interpreted.

c.All of the choices are correct

d.A correlation coefficient is not proper for the data.

Which of the following statements is (are) true?

a.neither choice is correct

b. both choices are correct

c. Correlations allow us to evaluate the strength of a relationship.

d. Correlations show causal relationships

Which of the following statements describes a positive correlation?

a. The greater the cost, the better the merchandise.

b. Walnut is more dense than pine.

c. The more I study, the lower my test scores.

d. None of the choices are correct.

Situation A: correlation coefficient of .00; Situation B; correlation coefficient of 1.00. Withrespect to cause and effect statements, Situation A allows the statement______ and Situation B allows.

a. "there is no cause and effect relationship" and "there is no cause and effect relationship";

b. "there is no cause and effect relationship" and "there may be a cause and effect relationship";

c. none of the choices are correct

d."there may be a cause and effect relationship" and "there may be a cause and effect relationship";

If an ANOVA with four samples produces a significantF, you can find out which samples are significantly different from the others by

a. performing HSD tests

b. neither are correct

c. both are correct

d. performing paired samples t-tests

Males and females were compared for the mean number of smiles during a five-minute interview. The 30 males' mean was 3.62 and the 24 females' mean was 5.04. Anlevel of .05 was adopted and anF= 4.02 was obtained. What conclusion is appropriate?

a. females smile more than males

b. none of the choices are correct

c. males smile more than females

d. the null hypothesis should be retained

The ANOVA technique described in the text can be used on

a.both are correct

b.paired samples design

c.independentsamples design

d.neither are correct

In Kentucky, the Hatfield family has been feuding with the McCoy family for generations. Suppose you wanted to compare the biological fitness of the Hatfields to that of the McCoys and that you had a reliable test of fitness. Many Hatfields and many McCoys were tested. The study as described is one of

a.paired samples

b.descriptive statistics

c.comparison of a sample to a population mean

d.independent-samples

The null hypothesis in a paired samplesttest is that the two

a. samples have different means

b. populations have different means

c. populations have identical means

d. samples have identical means

Identify the following as paired samples or independent samples. Also give the appropriatedf.

Thirteen volunteers weighed themselves before and after a two-day fast.

a. Paired,df=8

b. Paired,df=12

c. Paired,df=10

d. Independent,df=12

What do you call measurements of a subset of a population?

a. statistics

b. sample

c. variable

d. population

What is a graph with a great preponderance of high scores?

a. positive skew

b. negative skew

c. normal distribution

d. bimodal distribution

What do you call a variable controlled by the researcher?

a. dependent variable

b. independent variable

c. level

d. extraneous variable

What is a graph with a great preponderance of low scores?

a. bimodal distribution

b. normal distribution

c. positive skew

d. negative skew

What do you call the observed variable that is expected to change as a result of changes in the independent variable in an experiment?

a. level

b. extraneous variable

c. independent variable

d. dependent variable