Question

In a survey of 3488 adults aged 57 through 85​ years, it was found that 80.5​% of them used at least one prescription medication.

Complete parts​ (a) through​ (b) below.

a. How many of the 3488 subjects used at least one prescription​ medication?

________ ​(Round to the nearest integer as​ needed.)

b. Construct a 90% confidence interval estimate of the percent of adults aged 57 through 85 years who use at least one prescription medication.

_____% < p < _____%

Answer 1

The statistical software output for this problem is:

From above output:

a) Number of the 3488 subjects used at least one prescription​ medication = 3488 * 0.805 = 2808

b) 90% confidence interval:

79.4% < p < 81.6%