1 . You are asked to test for a relationship between number of drinks per week a
ID: 3127876 • Letter: 1
Question
1 . You are asked to test for a relationship between number of drinks per week and BMI level (normal, overweight, obese) using the BRFSS data with a random group of 400 participants. Which test would you choose?
a.Chi Squared test
b.Regression for inference
c.Analysis of variance
d.Independent samples t-test
2 . A researcher believes that college freshmen are exercising less than the recommended guidelines of 150 minutes per week. His hypotheses are H0: =150, Ha: <150, alpha=.05. He surveys a random sample of 4000 college freshman and obtains a mean of 149.65 minutes per week with p-value=.023. Which if the following statements is true?
a.The one tailed test was more conservative for detecting a significant difference.
b.The results would not be significant if alpha=.05, two-tailed
c.The difference, though statistically significant, is not compelling or practically meaningful
d.A type II error may have occurred
3 . Under what circumstances is it most appropriate to use a one-tailed alternative hypothesis?
a.An unexpected finding (in the opposite direction) would have dangerous implications for public health
b.To ensure the study has a statistically significant finding
c.The population of interest is small and it is difficult to obtain a large sample size
d.To reduce a type I error
Explanation / Answer
1. Correct Answer : (b).Regression for inference
Since the impact of no. of drinks on the variable BMI Level.
2. Here, P-vlaue = 0.023 which is less than alpha (0.05), we reject H0.
i.e. the college freshmen are exercising less than the recommended guidelines of 150 minutes per week.
correct Answer : Opation (a)
"The one tailed test was more conservative for detecting a significant difference."
3. Option (D) correct
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