Identify the correct written form of the null hypothesis
Suppose you are a researcher for a clinical trial testing a new antidepressant drug called Joyzepam. In order to determine the new drugʻs effectiveness, this study compares Joyzepam to two other conditions. One is a Placebo (i.e., a non-active drug) and the other is an existing antidepressant / anti-anxiety drug called Anxifree. A collection of 18 participants (N = 18) with moderate to severe depression are recruited for your initial testing and randomly assigned to one of the three conditions (Joyzepam, Anxifree, or Placebo) with six participants (N = 6) in each condition. A psychologist then assesses the mood of each person after a 3 month period on their respective drug and the overall improvement in each person’s mood is assessed on a scale ranging from -5 (mood decreased) to +5 (mood increased), with a score of zero (0) indicating no mood change. Using "mood.gain" as your dependent variable and "drug" as your independent variable, conduct a One-Way, Between Subjects ANOVA, at alpha = 0.05, to see if participants mood ratings are significantly different between the three drug groups being compared.
Identify the correct written form of the null hypothesis
- A. The mean mood gain between the three types of drugs tested are equal
- B. The mean mood gain between joyzepam and anxifree will be equal
- C. The mean mood gain between at least two types of drugs tested will be equal
- D. The mean mood gain between the three types of drugs tested are NOT equal
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