20 terms

# Research final multiple choice

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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
The appropriate measure of dispersion for last question is
Range
Variance
Standard Deviation
None of the above
None of the above
On what basis does the t-test compare groups?
Frequency distributions
Mean score
Alpha level
Confidence intervals
Mean score
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
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
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
For which of the following levels of significance is the risk of making a type II error greatest?
.10
.05
.01
.001
.001
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%
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
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
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
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
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
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
True-False
As sample size decreases, so does the standard error of the mean.
FALSE
True False
A researcher never knows whether an error has been committed in statistical decision making.
TRUE
True False
A statistically significant finding means that the obtained results are not likely to have been due to chance.
True
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
True False
Establishing a significance level of .01 is more conservative than establishing one of .05
True
True False
Nonparametric tests have fewer assumptions than parametric tests.
True