just determine which hypothesis tests to use 1. A researcher wanted to investiga
ID: 3150526 • Letter: J
Question
just determine which hypothesis tests to use
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. Which test would you use to compare the groups? (1 pt)
2. Suppose in Question #1, the researcher only recorded whether or not each hamster showed an increase in its weight, instead of its actual weight, which test would you use? (1 pt)
3. Suppose that in another research study, the researcher uses 50 hamsters, and administers intravenous glucose (10 mg/min) to all of them. At the end of 4 weeks, he records whether (a) the hamster reduced in weight from its initial weight, or (b) maintained its original weight, or (c) increased in weight from its initial weight. He is interested in seeing if the number of hamsters that increase in weight is 4 times higher, compared with those that maintain their initial weight, or those that decrease in weight. Which test would he use? (1 pt)
4. Suppose that, in the study design in #3, the researcher also records the gender of the hamster, and is interested in seeing whether there is a relationship between a hamster’s gender and whether it maintained, reduced or increased its weight, which test would he use? (1 pt)
Explanation / Answer
1.A independent samples t should be used. The Independent Samples t Test compares the means of two independent groups in order to determine whether there is statistical evidence that the associated population means are significantly different.
2.A paired t test should be used. Paired sample t-test is used to compare two population means in the case of two samples that are paired in some way or other. Paired sample t-test is used in 'before-after' studies, or when the samples are the matched pairs.
3.One sample t test for mean. The one-sample t-test is used to test the sample mean. Thus, the hypothesis tests whether the average of our sample (M) suggests that the samples come from a population with a know mean (m) or whether it comes from a different population.
4.A chi square test of independence. The test is applied when you have two categorical variables from a single population. It is used to determine whether there is a significant association between the two variables
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.