Question

Central Eye Clinic advertises that 90% of its patients approved for LASIK surgery to correct vision problems have successful surgeries.

(a) In the random number table, assign the digits 0 through 8 to the event "successful surgery" and the digit 9 to the event "unsuccessful surgery." Does this assignment of digits simulate 90% successful outcomes?

YesNo     

(b) Use the random digit assignment model of part (a) to simulate the outcomes of 15 trials. Begin at column 1, line 2. (Enter S for success and F for failure, separated by commas.)

  

(c) Your friend assigned the digits 1 through 9 to the event "successful surgery" and the digit 0 to the event "unsuccessful surgery." Does this assignment of digits simulate 90% successful outcomes?

YesNo     

Using this digit assignment, repeat part (b). (Enter S for success and F for failure, separated by commas.)

  

Answer 1

Answer:

A) Yes

B) S,F,S,S,S,S,S,S,S,S,S,S,S,S,F

C) Yes. All 15 are S

• If a patient was -6.0 diopters and after Lasik was -1.00 diopter, most surgeons and those in the industry would consider this a failure. The patient, however, may consider it a success because at age 50 she does not need to use reading glasses and still qualifies for a driver's license with 20/40 distance vision.
• A patient who can make out the Snellen 20/20 line - familiar letters in black on a white background in a controlled lighting environment - may be considered by the doctor a success, but the patient does not have the crispness of vision .experienced before Lasik and with glasses.
• The nonprofit patient advocacy USAEyes.org took a different approach.
• Success of Lasik means that the patient received what was expected - no matter the numbers.
• Using a scale of Much Worse Than Expected, Worse Than Expected, As Expected, Better Than Expected, and Much Better Than Expected, the USAEyes Competence Opinion Reletave to Expectations (CORE) patient survey found:
• 99% report quality of life as expected, better, or much better
• 98% day vision as expected, better, or much better
• 98% no complications or issues are seldom problematic
• 98% would recommend surgery to family and friends.
• 97% would have surgery again, knowing what they know now
• 96% wear corrective lenses as often as expected, less, or much less than expected
• 96% report postop vision without lenses as expected, better, or much better than expected when compared to preop vision with lenses
• 96% report overall quality of vision as expected, better, or much better than expected
• 91% no complications at any time
• 91% night vision as expected, better, or much better
• 7% complications seldom problematic
• yet 91% of these same patients would have surgery again
• 2% complications frequent or always problematic
• yet 22% of f these same patients would have surgery again