12. In a study of intraobserver variability in the assessment of cervical smears
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Question
12. In a study of intraobserver variability in the assessment of cervical smears, 3325 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 of this study are shown below [15] Second Screening First Screening Present Absent Total 1763 489 2252 Present 1073 403 670 Absent Total 2166 1159 3325 (a) Do these data support the null hypothesis that there is no association between time of screening and diagnosis? The data could also be displayed in the following manner: Screening Abnormal First Second Total Cells 2252 2166 4418 Absent 1073 1159 2232 6650 Total 3325 3325Explanation / Answer
Null hyphothesis is a type of hyphothesis which has no statistical significance between the two variables, the data shared in the first column do support the null hyphothesis as it has no statistical significance between the first screening and second screening.
On the other hadn the second data table is more clear and there is nothing wrong with the presentation, to analyse the data we need to understand the variable and the meaning of the identifcations used in it.
Present/Absent represent the presence or absence of abnormal squamous cell which an observer founds during screening. The first and the second screening are the variable in this case and to understand the table, we just evaluates the values against the vairables.The data shows the fluctuation in both the variables and there total values to evalute the slides used during screening.
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