Prelim 2 Prep

Question 1

The frequency in a histogram is?

Answer 1

The sample size as it counts the number of times a class occurs.

Question 2

Is it that the confidence interval has a CL% of being correct?

Answer 2

No, there is a CL% chance that the parameter is contained within the interval estimate.

Question 3

In a distribution, why do you want to be in the middle of the distribution between the two symmetrical alpha values?

Answer 3

Since you are closer to the mean and better able to predict it,

Question 4

The P in (-Ez < estimator - parameter < Ez)?

Answer 4

This is essentially a confidence interval.

Question 5

Standard error?

Answer 5

How different from the population mean is from the sample mean: sigma/sqrt(n)

Question 6

Mean Square Error?

Answer 6

Estimates

Question 7

Area of histogram being probability is only true when?

Answer 7

Relative frequency.

Question 8

Sigma^2 is the?

Answer 8

Variance of the sample mean.

Question 9

S^2 is the?

Answer 9

Estimator for the actual variance of the distribution.