A researcher wants to assess the effect of using different modalities for 10 day

Question

A researcher wants to assess the effect of using different modalities for 10 days to gain pain-free range of motion (ROM) in patients with elbow tendonitis. Four groups are created and four modality of care are offered. One gets ultrasound; another one gets ice; a third one gets massage; and the fourth is assigned to be the control. The dependent variable is elbow ROM, measured in degrees and is normally distributed; the independent variable (type of modality) has four levels

A researcher conducted an experiment to determine the effect of a lecturer's professional background on student preferences to hear his lecture. In a regular classroom situation, 30 students were told that the administration wished to know their preferences regarding a forthcoming visiting lecturer series. They were asked to evaluate a professor who will be visiting the campus. One-third of the students were told that the professor had an MPH degree; one-third were told the professor had an MPH/MD degree; and one-third were told the professor had an MPH and a Dr PH degree. All students were then asked to indicate their willingness to attend the professor's lecture (higher scores indicated greater willingness). Which statistical test would you use to determine if there is a significant difference between groups of students with respect to their willingness to attend the lecture?

A researcher wants to assess if physical activity alleviates depression. Sixty participants are randomly allocated to one of three groups: no exercise; 20 minutes of jogging per day; or 60 minutes of jogging per day. At the end of a month, the researcher asks each participant to rate how depressed they now feel, on a Likert scale that runs from 1 ("totally miserable") through to 100 (ecstatically happy").

From the list shown below, for each of the following hypothesis testing situations indicate the type of test you would use. Unless otherwise, the significance level for all the tests is .05.

One-way ANOVA

Pearson product-moment correlation

Kruskal-Wallis

Spearman rank correlation

Linear Regression

Multiple Linear Regression

Explanation / Answer

For each of the questions, please find below the answers: -

a)

A researcher wants to assess the effect of using different modalities for 10 days to gain pain-free range of motion (ROM) in patients with elbow tendonitis. Four groups are created and four modality of care are offered. One gets ultrasound; another one gets ice; a third one gets massage; and the fourth is assigned to be the control. The dependent variable is elbow ROM, measured in degrees and is normally distributed; the independent variable (type of modality) has four levels: - One-way ANOVA

b)

A researcher conducted an experiment to determine the effect of a lecturer's professional background on student preferences to hear his lecture. In a regular classroom situation, 30 students were told that the administration wished to know their preferences regarding a forthcoming visiting lecturer series. They were asked to evaluate a professor who will be visiting the campus. One-third of the students were told that the professor had an MPH degree; one-third were told the professor had an MPH/MD degree; and one-third were told the professor had an MPH and a Dr PH degree. All students were then asked to indicate their willingness to attend the professor's lecture (higher scores indicated greater willingness). Which statistical test would you use to determine if there is a significant difference between groups of students with respect to their willingness to attend the lecture?: - One-way ANOVA

c)

A researcher wants to assess if physical activity alleviates depression. Sixty participants are randomly allocated to one of three groups: no exercise; 20 minutes of jogging per day; or 60 minutes of jogging per day. At the end of a month, the researcher asks each participant to rate how depressed they now feel, on a Likert scale that runs from 1 ("totally miserable") through to 100 (ecstatically happy"): - Kruskal-Wallis

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