Homework answers / question archive / 1) 1) If all the tests are administered in the same manner and cost the same, which one would you recommend that your clinic use? Justify your answer

1) 1) If all the tests are administered in the same manner and cost the same, which one would you recommend that your clinic use? Justify your answer

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1) 1) If all the tests are administered in the same manner and cost the same, which one would you recommend that your clinic use? Justify your answer. 2) What is the prevalence of abnormal cells in your clinic? What does this mean in nonstatistical language, or plain English?

2) 1) Which screen has the highest positive predictive value? If you administered this screen in a population with a high prevalence, what would you expect to happen to the positive predictive value? 2) If you know that early treatment helps prevent infertility and that chlamydia is very contagious, would sensitivity or specificity be more important to you? With that in mind, which of these tests would you prefer to utilize?

3) 1) What is the prevalence of the disease you are testing for? 2) If this disease were fatal, would you be concerned about this prevalence rate? 3) Which screen has the lowest specificity? Why might it still be a good screen to use?

4) 1) What is the specificity of your new test? 2) Give an example of a clinical situation in which this might be a good test to use 3) What is the positive predictive value of your screening test?

5) 1) How many true positives do you have? 2) Without using statistics jargon, explain what each box represents. 3) What is the sensitivity of your new test?

6) You have a new tool that examines outcomes in pregnancy. A previously validated tool reports that cesarean section rates in your area are 30%. The correlation between the old tool and your tool is 0.7. This result indicates which of the following? convergent validity content validity divergent validity validity from contrasting groups

7) 1) Your test is very good at correctly identifying when a person actually has a disease. Your test a measure of which of the following? sensitivity specificity collinearity effect size 2) if a person has a disease and tests positive for it, the result is an example of which of the following? a true negative a false positive a false negative a true positive

8) 1) If the distribution is skewed, what do you know about the mean, median, and mode? 2) Researchers run an analysis to determine if taking levothyroxine is associated with tachycardia. They report a p-value of 0.04. What general impression do you get from this result?