57 Statistics – 1
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1. ANOVA is used to compare two groups. | ![]() |
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2. Scales with multiple answers increase reliability in measuring attitude. | ![]() |
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3. The chi-squared test of a 5 by 3 contingency table will have 15 degrees of freedom. | ![]() |
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4. The chi-squared test could be used in a study of response to a new antidepressant in four different hospital populations. | ![]() |
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5. Correlation is used to compare two groups. | ![]() |
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6. Regarding correlation coefficient ‘r’, a value of +1 or −1, implies a cause–effect relationship. | ![]() |
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7. Knowing the outcome status in a cohort study may lead to information bias. | ![]() |
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8. A type II error occurs when a real difference is missed. | ![]() |
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9. Observer-rated scales are prone to ‘halo effect’. | ![]() |
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10. The least squares method is used for dichotomous variables. | ![]() |
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11. Logistic regression is done by the least squares method. | ![]() |
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12. Means taken from large samples of a skewed distribution approximate to a normal distribution. | ![]() |
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13. T2 test is used for non-parametric variables. | ![]() |
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14. Normal distribution is a requirement for parametric testing. | ![]() |
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15. The power of a test varies with the size of the sample. | ![]() |
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16. Volunteer bias would deter healthy people from responding to postal questionnaires. | ![]() |
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17. R2 usually increases if a further independent variable is added. | ![]() |
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18. Operational definition of concepts used in rating scales increases reliability. | ![]() |
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19. Newspaper advertising can be used for random sampling. | ![]() |
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20. Psychiatric screening instruments used in a general hospital are usually used to detect uncommon syndromes. | ![]() |
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21. In a trial of two antidepressants, failure to show a difference in outcome may be due to there being less than 5% of subjects with previous episodes of depression. | ![]() |
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22. A result statistically significant at a level of 5% implies that the correlation coefficient is 0.95. | ![]() |
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23. A sensitive test has a low number of false positives. | ![]() |
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24. Split-half reliability measures the validity of a test. | ![]() |
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25. In an experiment to determine whether drug therapy or hypnosis is better as a treatment to stop smoking, the results are measured by the number of cigarettes smoked after treatment. In this study, hypnosis is a dependent variable. | ![]() |
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