Question

_______ A researcher implements a smoking cessation study with 3
randomized groups: on-line counseling/support, face-to-face
counseling support, and no counseling support.

Research question: Is there a significant difference in number of
cigarettes smoked across the study groups? --->

a. Independent t-test

b. Dependent t-test

c. One-way ANOVA

d. Two-way ANOVA

e. RM-ANOVA

f. Pearson’s Correlation

g. Multiple Linear Regression

**Please indicate which statistical test should be
used.**

Answer #1

Here, we want to test whether there a significant difference in number of cigarettes smoked across three study groups. Therefore, there are more than two groups. We know that, we use one way ANOVA when we want to test difference in means of more than two groups.

On the other hand, Pearson's correlation and Multiple linear regression are used to test linear relationship between two or more variables.A t-test is used to test difference in mean between two groups and RM-Anova is used when the groups are dependent, i.e , the same group is used for measuring data before and after. Therefore, the correct answer is one-way ANOVA.

c. One-way ANOVA

__________ A researcher hypothesized that the score from the GRE
test is positively associated with the final-statistics course
grade. The data was collected from 80 new nursing students on their
GRE score and final-statistics grade.
Research question: Is there any relationship/association between
the GRE score and final-exam score in statistics course among
nursing students? Please indicate which statistical test
should be used below.
a. Independent t-test
b. Dependent t-test
c. One-way ANOVA
d. Two-way ANOVA
e. RM-ANOVA
f. Pearson’s Correlation...

__________ A team of researchers were evaluating the
effectiveness of motivational interviewing as a strategy to promote
physical activity among patients who participated in cardiac
rehabilitation. Total of 110 participants were recruited from
cardiac rehabilitation center and all received motivational
interviewing intervention. The data on physical activity was
collected at baseline, 6 weeks and 12 months follow up.
Research question: Is there a significant difference in physical
activity at 3 time points? Please indicate which
statistical test should be used....

A researcher did a study to investigate the potential
relationship between diastolic blood pressure (DBP, dependent
variable) and age (independent variable) for boys 5 to 13 years
old. The data were analyzed using a simple linear regression model
and the statistical results were as following.
Estimate Std. Error t value Pr(>|t|)
b0 (Intercept) 49.8844 5.7272 8.710 1.12e-05
b1 for Age 2.1927 0.6025 3.639 \ 0.00541
Residual standard error: 5.552 on 9 degrees of freedom
Multiple R-squared: 0.5954, Adjusted R-squared: 0.5505...

Questions 14-18 are based on Scenario 4. A
researcher is interested in studying how exposure to blue spectrum
light (the light emitted from smartphones and other technology
devices) can influence sleep quality. She randomly assigns one
group of participants to use no technology before bed for 1 week,
and a second group of participants to look at a smartphone or
tablet for 1 hour before bed for 1 week, and a third group to read
a book for 1 hour...

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