# A political candidate has asked you to conduct a poll to determine what percentage ofpeople support him. If the candidate only wants a 10% margin of error at a 90%confidence level, what size of sample is needed?Hint: Video[+]

Question
Asked Nov 13, 2019
3 views

Please explain how to do this problem on paper and TI 84

check_circle

Step 1

It is given that the confidence level is 0.90.

Here,

Step 2

The critical value using TI-84 is obtained as follows:

• Enter 2nd > DISTR.
• Choose 3: InvNorm(
• Enter area as 1– 0.05, µ as 0 and σ as 1.
• Select Paste then click Enter.

Thus, the output obtained as 1.644853626.

Hence, the value of z0.05 is 1.645.

Here, the margin of error (E) is 0.10.

As there is no any estimates available, the ...

### Want to see the full answer?

See Solution

#### Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in