Question

Use the following information to answer questions.

A new screening test for Lyme Disease is being evaluated. It was administered to 1,235 people in southern Maine. While 115 people with the disease tested positive for it another 47 people who do not have disease tested positive for Lyme. 721 people who did not have Lyme tested negative. [Data are fictitious but realistic.]

Using the data above, complete a 2x2 table:

Answer 1

SOL)

According to data the following table can be written as

	Test positive	Test negative	Total
Have disease	115	352	467
Not have disease	47	721	768
Total	162	1073	1235

We have to find test positive given have disease and test negative given not have disease

Sensitivity=P( Test positivity given have disease)

                    =115/467

                     =0.2463

Sensitivity=P(test negative given not have disease)

                      =721/768

                       =0.9388

Positive predictive value= true positive/total positive

                                           =115/162

                                             =0.7099

We know negative predicted value=721/1073                                                                    =0.6719

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