Practice questions 3

Question 1

Q1. The following would be features of a study, which tests the theory that patients tend to prefer a particular treatment regime.

Pick which one/s
1 Hypothesis testing
2 Survey
3 Control for confounding variability.

Answer 1

1 Hypothesis testing
2 Survey

The answer to Q1 would be B. The researcher his testing a theory so there is a hypothesis. This could be
done using a survey (which is the only method offered in the question). This is not an experiment so there
would be no control.

Question 2

Q2. The following would be features of a study to investigate a theory that the outcome of a patients’ treatment with radiotherapy is affected by their motivation to live.

Pick which one/s
1. Hypothesis testing
2. Manipulation of an independent variable.
3. Control group

Answer 2

1. Hypothesis testing

The answer to question Q2 would be D. The researcher his testing a theory so there is a hypothesis.
Manipulation in this situation would be unethical even if it were possible. This is not an experiment so
there would be no control.

Question 3

Select ONE option from the list below, which is a correct statement.

A. Inferential statistics tell you something about the influence of systematic variability.

B. A type 1 error is a mistake in setting up the statistical hypotheses.

C. The Mann-Whitney U test can be performed on ratio data.

D. Ratio data is the only requirement for a t test.

E. Statistical significance implies that the alternative hypothesis has been rejected.

Answer 3

C. The Mann-Whitney U test can be performed on ratio data.