Question

1. A researcher at a major clinic wishes to estimate the proportion of the adult population of the United States that has sleep deprivation. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 4%?

a. 256

b. 422

c. 846

d. 423

e. 255

2. A state highway patrol official wishes to estimate the number of legally intoxicated drivers on a certain road.
a) How large a sample is needed in order to be 96% confident that the sample proportion will not differ from the true proportion by more than 2%?

a. 2627

b. 2626

c. 25

d. 4724

e. 4728

b) Repeat part (a) assuming previous studies found that 85% of the drivers on this road are legally intoxicated.    

a. 1340

b. 2627

c. 3703

d. 3702

e. 14   

Answer 1

1.

2.

(a)

(b)