Question

A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 4 percentage points with 95​% confidence if ​(a) he uses a previous estimate of 22​%? ​(b) he does not use any prior​ estimates? Click here to view the standard normal distribution table (page 1).LOADING... Click here to view the standard normal distribution table (page 2).LOADING... ​(a) nequals nothing ​(Round up to the nearest​ integer.) ​(b) nequals nothing ​(Round up to the nearest​ integer.)

Determine the area under the standard normal curve that lies to the right of ​(a)

Upper Z equals 1.69 commaZ=1.69,

​(b)

Upper Z equals negative 0.88 commaZ=−0.88,

​(c)

Upper Z equals 0.54 commaZ=0.54,

and ​(d) Upper Z equals negative 1.43 .Z=−1.43.

​(a) The area to the right of

Zequals=1.691.69

is

nothing.

​(Round to four decimal places as​ needed.)

​(b) The area to the right of

Zequals=negative 0.88−0.88

is

nothing.

​(Round to four decimal places as​ needed.)

​(c) The area to the right of

Zequals=0.540.54

is

nothing.

​(Round to four decimal places as​ needed.)

​(d) The area to the right of

Zequals=negative 1.43−1.43

is

nothing.

​(Round to four decimal places as​ needed.)

Answer 1