1. A researcher wanted to investigate the effects of a high glucose diet on the
ID: 3150499 • Letter: 1
Question
1. A researcher wanted to investigate the effects of a high glucose diet on the weight of Syrian hamsters (Mesocricetus auratus). He randomly selected 100 adult hamsters to receive either (a) intravenous glucose (10 mg/min) or (b) intravenous saline for 30 minutes each day for 4 weeks. At the end of the 4 week period, he measured the weight (in ounces) of each hamster. The researcher found that the weight of the hamsters in the glucose group was right skewed, so he transformed all the data by taking the natural log of the hamsters’ weights. After the transformation, the data points were normally distributed.
a. What type of statistical test should the researcher use to determine if the transformed weights of hamsters in the two groups differ?
Explanation / Answer
a) The researcher followed the Independent group assumption: The weight of adult hamsters for two different treatment groups are independent. Randomization condition: The hamsters were selected at random. Independence assumption: The amount of intravenous glucose and intravenous saline are independent of each other. Nearly normal condition: The distribution finally follows nearly normal condition with sufficiently large sample size of each groups.
Perform two sample-t test to chcek if the transformed weights of hamsters in two groups differ.
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