Question

	second screening
first screening	present	absent
present	1763	489
absent	403	670

A study of intra-observer variability in the assessment of cervical smears, 3,325 slides were screened for the presence or absence of abnormal squamous cells. Each slide was screened by a particular observer and then rescreened six months later by the same observer. The results are shown below. Test whether time of screening is related to the diagnosis. Was the observer more likely to detect squamous cells at one of the screenings? Use a 5% level of significance. Give each of the following to receive full credit: 1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of the test statistic; and 5) your conclusion including a comparison to alpha or the critical value. You MUST show your work to receive full credit. Partial credit is available.

Answer 1