You are going to estimate how long a person holds down a button on their calculator by randomly selecting people and asking them to do something on your calculator (which has a special timer to record how long the enter button is pressed). You practiced on the people at work and found a standard deviation of about 0.37 seconds. You want to get a 94% confidence interval that is only 0.06 in width. How many people do you need to have in your study

You need to have 538 people in your study.

Step-by-step explanation:

We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of .

That is z with a pvalue of , so Z = 1.88.

Now, find the margin of error M as such

In which is the standard deviation of the population and n is the size of the sample.

You practiced on the people at work and found a standard deviation of about 0.37 seconds.

This means that

You want to get a 94% confidence interval that is only 0.06 in width.

This means that

How many people do you need to have in your study?

This is n for which M = 0.03. So

Rounding up:

You need to have 538 people in your study.

me! what did you put for this question?

step-by-step explanation:

b

step-by-step explanation: