# compute and choose answer

*label*Statistics

*timer*Asked: May 7th, 2015

**Question description**

Suppose we want to build an interval estimate for the

proportion of Indiana households who live in owneroccupied houses with a 95% confidence level and a margin

of error of ±0.02 (two percentage points). What is the

minimum sample size to achieve this margin of error? Use

0.70 for the planning value.

a) 1537

b) 1801

c) 2017

d) 2401

16) We can make a confidence interval more precise (narrower)

by,

a) increasing the sample size.

b) reducing the confidence level.

c) increasing the confidence level.

d) both (a) and (b) are correct.

17) An interval estimate for the mean weekly wage of Illinois

workers had a lower and upper end, respectively of $1,055

and $1,153. The sample size was n = 196, with a standard

deviation of $294. What is the confidence level for this

interval estimate?

a) 99 percent

b) 98 percent

c) 95 percent

d) 90 percent