AP Stat Question

Test Preparation AP Test Preparation
1

<p>Sample size is 25--unknown mean and standard deviation. </p>

<p>*) Say the mean of all measurements is 500 and std. dev is 40, what is an estimate for the true mean and std. dev of the popul. from which the samples were drawn?</p>

<p>*) What's the std. dev of the estimate if repeated multiple times?</p>

<p><em>) What's the prob of 10</em>each measurement being bigger than 5000?</p>

2

<p>best guess would be true mean = sample mean, therefore 500 and st. dev. 40</p>

<p>Not sure on the second one</p>

<p>normalcdf(500,e99,500,40) = your answer.
(ignore the 10x whatever, 5000/10 = 500 so you do not need to calculate new mean and st. dev)</p>