Three independent researchers wanted to study the effect of type of diet on weight gain in...
Three independent researchers wanted to study the effect of type of diet on weight gain in mice. Each researcher was interested in 3 specific diets: standard mouse chow diet, “junk” food diet, and an organic diet. Each researcher conducted their own study, but they all followed similar procedures. For studies A, B, and C, a total of 66 mice were randomly assigned to receive one of the 3 types of diets (22 in each group). The outcome variable, weight gain (in grams), was assessed after 1 month.
a. What is the factor (independent variable) in these studies?
b. What is the dependent variable in these studies?
c. Why would an independent t-test not be the most appropriate test to determine whether the diet groups differ with respect to weight gain?
Homework Answers
a) Factor (independent variable) in this study is the type of diet which takes one of the 3 different values.
b) Dependent variable is the Weight Gain after 1 month of the experiment.
c) Though the dependent variable is continuous, which is required for independent t-test, there are 3 factors in this study which the independent t-test is not meant to compare. It can compare only 2 groups.
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Three independent researchers wanted to study the effect of type
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Determine what type of study design was used. After each study
design, write down a strength and limitation of the study
design.
Objective: To better understand the mechanisms behind breastfeeding and childhood obesity, we assessed the association of weight gain with the mode of milk delivery aside from the type of milk given to infants. DESIGN: AX study of infants followed up from birth to age 1 year. Multilevel analyses were conducted to estimate infant weight gain by type of...
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In a follow-up to Sperling (1960), researchers were interested in whether a tine delay affected the span of apprehension of adolescents To test this, they conducted a study where participants were recruited to complete a span of apprehension task where they viewed a display of letters and, after the letters disappeared, vere asked to report a subset. All participants were presented with each of two conditions. In the no delay condition, after the letter display was removed, participants were...
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