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As a researcher you collect data on the marital status of your subjects. The appropriate measure of central tendency to use for this variable is:

Mean

Median

Mode

Standard Deviation

Mode

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The appropriate measure of dispersion for last question is

Range

Variance

Standard Deviation

None of the above

None of the above

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On what basis does the t-test compare groups?

Frequency distributions

Mean score

Alpha level

Confidence intervals

Mean score

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Which of the following correlation (person r) coefficients would give you the most precise prediction?

r=.80

r=.60

r=.45

r=-.85

r=-85

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The use of inferential statistics permits the researchers to:

A: generalize to a population based on info gathered from a sample

B: describe info obtained from empirical observation

C: interpret descriptive statistics

D: reject the null hypothesis

Generalize to a population based on info gathered from a sample

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The major factor that affects the standard error of the mean (SEM) is the

A: value of the score range

B: shape of the sampling distribution

C: sample size

D: value of the mean

Sample size

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For which of the following levels of significance is the risk of making a type II error greatest?

.10

.05

.01

.001

.001

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Assuming the normal distribution, about what proportion of a sample lies between the mean & 2 SDs above the mean?

34%

47%

68%

95%

none of the above

47%

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A statistical procedure that is used to determine whether a significant difference exists between any number of the group means the

t-test

ANOVA

Correlation coefficient

Mann-Whitney U-test

ANOVA

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If a researcher wanted to determine whether observed proportions differed significantly from expected proportions, the statistic would be a(n):

t-test

Correlation coefficient

ANOVA

Chi-square

Chi-square

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The independent variable is weight gain during pregnancy. The dependent variable is the infant's birth weight. The appropriate test statistic is a(n):

A. t-test

B. ANOVA

C. chi-square

D. pearson's r

Pearson's r

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The independent variable is race/ethnicity (white/nonwhite). The dependent variable is pulse rate. The appropriate statistical test is a:

A. t-test

B. Mann-Whitney U-test

C. chi-square

D. pearson-r

t-test

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The independent variable is marital status (single/married/separated or divorced). The dependent variable is whether or not the person had been hospitalized in the preceding 12 months. The appropriate statistical test is a(n):

A. t-test

B. ANOVA

C. chi-square

D. Pearson's r

Chi-square

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The independent variable is treatment group (visual stimulation/auditory stimulation/ no special stimulation). The dependent variable is infants' length of stay in the hospital after birth. The appropriate statistical test is a(n):

A. t-test

B. ANOVA

C. chi-square test

D. Pearson's r

ANOVA

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True False

A researcher never knows whether an error has been committed in statistical decision making.

TRUE

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True False

A statistically significant finding means that the obtained results are not likely to have been due to chance.

True

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True False

It would be appropriate for a researcher to test the difference between the means of 3 groups of students by a t-test for independent samples.

False

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True False

Establishing a significance level of .01 is more conservative than establishing one of .05

True