Question

Asked Nov 21, 2019

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A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 3% margin of error at a 99% confidence level, what size of sample is needed?

Step 1

Here, there is no information about the population parameter. Hence, use the conservative estimate π=0.5.

Step-by-step procedure to obtain the value of *z* using MINITAB:

- Choose
**Graph > Probability Distribution Plot**choose**View Probability****> OK.** - From
**Distribution**, choose ‘**Normal**’ distribution. - Click the
**Shaded Area** - Choose
**Probability**and**Both Tail**for the region of the curve to shade. - Enter the
**Probability****value**as**01**. - Click
**OK**.

Output using the MINITAB software is given below:

Step 2

From the output, the value of *z* is 2.576 for 99% confidence...

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