Construct a 2-by2 contingency table to determine the total number of people who fail the screening test and will be referred for diagnostic testing in the hearing centers.

Construct a 2-by-2 contingency table to determine the total number of people who fail the diagnostic test, which represents the target market for hearing aid sales.

Sales and margin data Vendor equipment specifications

Equipment

Sensitivity

Specificity

Portable audiology equipment for free screening

90%

96%

Clinic-based audiology equipment for follow-up diagnostic testing

99%

99%

Hearing Aids

Unit Price

2015 Sales

Margin

Low-end

$1,000

$400,000

25%

Mid-range

$2,500

$1,250,000

45%

High-end

$4,000

$400,000

60%