Question

Confidence level Critical value 0.90 $z^* = 1.645$ 0.95 $z^* = 1.960$ 0.99 $z^* = 2.576$ A poll reported 58% support for a statewide election with a margin of error of 2.1 percentage points. How many voters should be sampled for a 99% confidence interval? Round up to a whole number.

Name: confidence level critical value 090 z 1645 095 z 1960 099 z 2576 a poll reported 58 support for a statewide election with a margin of error of 21 percentage points how many voters should be 75288
Uploaded: 2023-06-17T15:08:08-08:00
Duration: 2 min 3 s
Channel: Madhur L
Description: confidence level critical value 090 z 1645 095 z 1960 099 z 2576 a poll reported 58 support for a statewide election with a margin of error of 21 percentage points how many voters should be 75288

          Confidence level Critical value
0.90 $z^* = 1.645$
0.95 $z^* = 1.960$
0.99 $z^* = 2.576$
A poll reported 58% support for a statewide election with a margin of error of 2.1 percentage points.
How many voters should be sampled for a 99% confidence interval? Round up to a whole number.

confidence level critical value 090 z 1645 095 z 1960 099 z 2576 a poll reported 58 support for a statewide election with a margin of error of 21 percentage points how many voters should be 75288

Added by Samantha N.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Madhur L

06/17/2023

Step 1

From the table, we have $z^* = 2.576$. We are also given that the poll reported 58% support, so $\hat{p} = 0.58$. The margin of error is 2.1 percentage points, so $E = 0.021$. Show more…

Show all steps

Thanks for your feedback!

Confidence level Critical value 0.90 $z^* = 1.645$ 0.95 $z^* = 1.960$ 0.99 $z^* = 2.576$ A poll reported 58% support for a statewide election with a margin of error of 2.1 percentage points. How many voters should be sampled for a 99% confidence interval? Round up to a whole number.