Based on the above information, the kappa estimate for the reliability of the two doctors' results is:
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Two neurologists, Drs. J and K, independently examined 70 magnetic resonance images (MRIs) for evidence of brain tumors. As shown in the table below, the neurologists read each MRI as either “positive” or “negative” for brain tumors.
Dr J | ||
Dr K | Positive | Negative |
Positive | 26 | 12 |
Negative | 14 | 18 |
Based on the above information, the kappa estimate for the reliability of the two doctors' results is: [Present your answer as a decimal fraction (two digits after the decimal point, round if needed). Example: 0.01]
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- A sample of men and women who had passed their driver's test either the first time or the second time were surveyed, with the following results: Results of the driving testGender First time Second timeMen 126 211Women 135 178a) Do these data suggest that there is a relationship between gender and the passing of their driver’s test from which the present sample was drawn? Let alpha=.05A public research company says that 63% of U.S. adults are concerned about their jobs because of the current state of the economy. A social services group surveys 500 adults and has a result of 70%. Using an alpha of.05 test the hypothesis claim of 63%An electrical engineer wishes to determine if, among two specific municipal buildings in town, Building “North” and Building “South”, whether the tensile strength of pipes (in psi) is not the same in each of these two buildings. A sample of pipes was chosen at random from both Building “North” and Building “South”, respectively. Using α = 0.05, which of the following statistical test, or parameter, would be best for determining whether tensile strength of pipes (in psi) is not the same in each of these two buildings? (Assume all statistical assumptions met.) a) Binomial Distribution b) Population Difference in Means (i.e., Unpaired Data) c) The Chi-Squared Test of Independence d) Population Mean Difference (i.e., Paired Data)
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