Chapter 6

Question 1

properties of a standard normal distribution

Answer 1

1. bell shape
2. mean=0
3. standard deviance=1

Question 2

calculator formula for probability (area between 2 z scores)

Answer 2

normalcdf(lower, upper, mean, standard deviation)

Question 3

calculator formula for z-score

Answer 3

invNorm(area to left, mean, standard deviation)

Question 4

critical value

Answer 4

z-score that separates values from unlikely values

Question 5

sampling distribution of a statistic

Answer 5

distribution of ALL statistics when ALL possible samples of size n are taken from same population

Question 6

central limit theorem

Answer 6

given a population with any distribution, the distribution of the sample means approaches a normal distribution as the sample sizes increase