- #1

- 199

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What is the probability that their sample mean will differ from the true mean by no more than 2.5 minutes?

What exactly do I use to determine this problem. Thanks for any help guys.

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- Thread starter needhelp83
- Start date

- #1

- 199

- 0

What is the probability that their sample mean will differ from the true mean by no more than 2.5 minutes?

What exactly do I use to determine this problem. Thanks for any help guys.

- #2

- 392

- 0

[tex]z=\frac{\bar{x}-\mu}{\sigma/\sqrt{n}}[/tex]

We can give more help if that's not enough.

- #3

- 199

- 0

So I don't understand where I would put the 2.5 mins. would go and where I would figure out the population mean.

- #4

- 392

- 0

Divide both sides of [tex]|\bar X-\mu|\le 2.5[/tex] by some number so that you have [tex]P(|Z|\le \text{some constant})[/tex]

Note that you don't need to know the population mean to do this.

- #5

- 199

- 0

Any help, anybody? More than happy to figure it out if just given a push in right direction.

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