From the list shown below, for each of the following hypothesis testing situatio

Question

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.

A.One-way ANOVA

B.Pearson product-moment correlation

C. Kruskal-Wallis

D. Spearman rank correlation

E. Simple Linear Regression

F. Multiple Logistic Regression

1. A researcher is interested in identifying how the relationship between the blood pressure levels of newborns and infants relate to subsequent adult blood pressure. The researchers found that blood pressure of a newborn is affected by several extraneous factors such as birthweight and the day of life on which blood pressure is measured. In this study, the infants were weighted at the time of the blood-pressure measurements. The researchers referred to this weight as the “birthweight”, although it differs somewhat from the actual weight at birth. Because the infants grow in the first few days of life, the researchers expected that infants seen at 5 days of life would on average have a greater weight than those seen at 2 days of life. The dependent variable was systolic blood pressure and the independent variables were birthweight and age in days

2. 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").

3. After finding that there is a correlation between birthweight (dependent variable) and gestational age (independent variable), a researcher wants to investigate how birthweight depends on gestational age.

4. A researcher wants to assess the correlation between two continuous normally distributed variables: heart rate and level of exertion

5. An investigator in interested in predicting cholesterol level (dependent variable) using body weight as the independent variable). The researcher believes that blood pressure, gender, age and diet may be potential confounders.

Explanation / Answer

1) The dependent variable was systolic blood pressure and the independent variables were birthweight and age in days . It is a Kruskal-Wallis test of ranks

2) Here depression is dependent variable or scale variable and physical activity is grouping or categorical variable.It is a ONE WAY ANOVA TEST

3) After finding that there is a correlation between birthweight (dependent variable) and gestational age (independent variable), a researcher wants to investigate how birthweight depends on gestational age.

Here researcher wants to predict dependent variable using indepedent variable . It is Simple Linear Regression

4)  A researcher wants to assess the correlation between two continuous normally distributed variables: heart rate and level of exertion. Since two continous normaly  distributed variables are exist then it is a Pearson product-moment correlation.

5) An investigator in interested in predicting cholesterol level (dependent variable) using body weight as the independent variable). The researcher believes that blood pressure, gender, age and diet may be potential confounders. The confouders comes only in  Multiple Logistic Regression. Hence it is  Multiple Logistic Regression

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