Question

In a survey of 3384 adults aged 57 through 85? years, it was found that 84.2?% of them used at least one prescription medication. Complete parts? (a) through? (c) below.

Answer 1

Ans:

a)

Number of subjects who used at least  one prescription medication=0.842*3384=2849

b)

90% confidence interval for proportion of all who used at least  one prescription medication

=0.842+/-1.645*sqrt(0.842*(1-0.842)/3384)

=0.842+/-0.010

=(0.832, 0.852)

or (83.2% to 85.2%)

c)The results tell us? that, with? 90% confidence, the true proportion of college students who use at least one prescription medication is in the interval found in part? (b).