PH 521 - Biostatistics » Summer 2021 » Week 7 Quiz

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Question #1
It is more difficult to reject a null hypothesis if we use a 10% level of significance compared with a 5% level of significance.
A.   TRUE
B.   FALSE
Question #2
The sample size required to detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.50 with 80% power and a 5% level of significance.
A.   FALSE
B.   TRUE
Question #3
You are an evaluation consultant for a research company. The company is conducting a clinical trial. They are trying to determine how large of a sample size they need. What is the most appropriate advice you could give?
A.   Make sure that your participants are as similar to each other as possible.
B.   Make sure that you have an equal number of participants in the treatment group and control group.
C.   Make sure that your sample closely represents the population it is meant to represent.
D.   Recruit as many participants as your budget can afford.
Question #4
Which scenario requires the largest sample size?
A.   A large confidence interval and a large sample standard deviation
B.   A small confidence interval and a large sample standard deviation
C.   A small confidence interval and a large mean
D.   A large confidence interval and a small sample standard deviation
Question #5
In an election poll, Candidate A has 48% of the vote, with a 3% margin of error. Candidate B has 52% of the vote, also with a 3% margin of error. What is the correct interpretation of these findings?
A.   Candidate B has significantly more votes than Candidate A
B.   The difference in votes between Candidate A and Candidate B is not statistically significant
C.   There is not enough information to draw any conclusions
D.   None of the above

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