Healthcare Stats Test 2
The independent samples t test is used to determine differences in the means of
2 groups only
The independent samples t test is best described as
A parametric test
the chi-square test is best described as
a nonparametric test
the kruskal-wallis test is
a nonparametric test
the mann-whitney u test is best described as
a nonparametric test
The paired t test is
a parametric test
the mcnemar test is used to determine if the proportions are different among
a pretest measure and a posttest measure, or a measure on a case group and a matched control group
which test should be used to answer the question: are men or women more likely to use seatbelts?
chi-square test
the mcnemar test is used to
compare pretest-posttest proportions on the same person, compare proportions on a case and matched control, and assess interrater agreement
If the ANOVA test is significant, what do we do next?
conduct a nonparametric test
the chi-square test is used to determine if the proportions are different among
four or more groups defined by two variables
do children who are immunized against chickenpox miss fewer days of school than children who are not immunized? which is the grouping variable?
immunization status
students' independent samples t test is best used when the measurement scale of the characteristic of interest is
interval or ratio
the one-way ANOVA is best used when the measurement scale of the characteristic of interest is
interval or ratio
the paired t test is est used when the measurement scale of the characteristic of interest is
interval or ratio
when analyzing the mean or median differences of paired data, which of the following are considered more important?
magnitude of the difference, and statistical significance of the difference
which test should be used to answer the question: are teenagers more likely to use a seat belt after viewing a graphic highway safety video?
mcnemar test
which of the following measures of central tendency are tested by the wilcoxon matched-pairs test to determine whether two groups are significantly different?
medians
a cross-tabulation is an appropriate way to display data that are
nominal
The Mann-Whitney U test is best used when the measurement scale of the characteristic of interest is
nominal and interval or ratio
the wilcoxon matched pairs test is best used when the measurement scale of the characteristic of interest is
nominal, interval, or ratio
the one-way ANOVA determines whether the means of the groups are different by comparing the
ranks of the raw data
do people who exercise three+ times a week have lower systolic blood pressure than people who exercise less than three times a week? which variable should be normally distributed?
systolic blood pressure
nonparametric tests such as the kw and the mw u-test should be used when
the data do not meet the distribution requirements for a parametric test
the kw test would be better than a one-way ANOVA when
the dependent variable is not normally distributed
the fisher's exact test is used when
the expected frequency in a cell is less than five
the yates' continuity correction is used when
the expected frequency in at least one cell is less than 10
if the variances of the two groups being compared are significantlly different which independent samples t test should be used?
the independent samples t test for separate variances
the kw h-test can be used when
the measurement scale is ordinal
the wilcoxon matched pairs test is most likely to be significant when
the sums of the ranks of the negative differences is substantially greater than that of the positive differences and vice versa
in a cross-tab table, what does A+B+C+D represent?
the total sample
student's independent samples t test is best used when
the total sample size is at least 30 and the grouping variable is dichotomous
the MW U-test is best used when
the total sample size is at least 8 and the grouping variable is dichotomous
the kw test is used to determine whether the distributions of which of the following are different from each other?
three or more independent measures
the mann-whitney u-test is used to determine the differences in the distribution of a variable in
two groups only
data are considered paired if
two measures of the same variable are taken on the same person, or measures of the same variable are taken on a case and a matched control
the paired t test is used to determine whether the means of which of the following are different from one another?
two repeated measures and measures from a case and a matched control
the situation in which an independent samples t test would be used instead of an ANOVA is
when there are only two categories in the grouping variable
the one-way ANOVA test tells you
which group has the biggest variance
which of the following statistical tests can be used if the data are paired but normally distributed in only one of the measures being compared?
wilcoxon matched pairs test
do women make more visits to their primary care physician in a year than men? which variable is the grouping variable?
Gender
if data are normally distributed in only one group, then which test can be used?
Mann-Whitney U-Test