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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:
The appropriate measure of dispersion for last question is
None of the above
None of the above
On what basis does the t-test compare groups?
Which of the following correlation (person r) coefficients would give you the most precise prediction?
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
For which of the following levels of significance is the risk of making a type II error greatest?
Assuming the normal distribution, about what proportion of a sample lies between the mean & 2 SDs above the mean?
none of the above
A statistical procedure that is used to determine whether a significant difference exists between any number of the group means the
If a researcher wanted to determine whether observed proportions differed significantly from expected proportions, the statistic would be a(n):
The independent variable is weight gain during pregnancy. The dependent variable is the infant's birth weight. The appropriate test statistic is a(n):
D. pearson's r
The independent variable is race/ethnicity (white/nonwhite). The dependent variable is pulse rate. The appropriate statistical test is a:
B. Mann-Whitney U-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):
D. Pearson's r
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):
C. chi-square test
D. Pearson's r
A researcher never knows whether an error has been committed in statistical decision making.
A statistically significant finding means that the obtained results are not likely to have been due to chance.
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.
Establishing a significance level of .01 is more conservative than establishing one of .05
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