Test 2

Question 1

If the probability distribution is symmetric about the mean, it is a () distribution.

Answer 1

Gaussian/normal

Question 2

What are the mean and std dev for “z” if used in standard normal deviation?

Answer 2

mean=0 ; std dev=1

Question 3

What is an experiment called when you do it without certainty of what will happen though you know the possible outcomes?

Answer 3

random experiment

Question 4

What type of variable is it when you take the outcome and give it a number?

Answer 4

random variable

Question 5

How do you correctly calculate an average?

Answer 5

(x,1)(p(x),1)+(x,2)(p(x),2)

Question 6

The mean of the sampling distribution of the mean is the (same/different) as the mean of the original population

Answer 6

same

Question 7

Which calculator function do you use to calculate the probability?

Answer 7

normalcdf

Question 8

Which calculator function do you use to calculate the percentile #?

Answer 8

invNorm(

Question 9

What is a value in the distribution that holds a specified percentage of the population below it?

Answer 9

percentile

Question 10

How do you calculate the standard deviation of a sample?

Answer 10

(population std dev) / (square root of the sample size number)

Question 11

What is a sampling distribution?

Answer 11

the collection of all possible sampling means

Question 12

two types of estimates that can be produced for any population parameter

Answer 12

point estimate and confidence interval estimate

Question 13

What is a single-valued estimate of the population parameter?

Answer 13

point estimate

Question 14

What is a range of values for a population parameter with a level of confidence attached?

Answer 14

confidence interval estimate

Question 15

What is built in by the CI and incorporates the confidence level and sampling variability or standard error of the point estimate?

Answer 15

margin of error

Question 16

How to generate a (%) CI

Answer 16

Xbar + z*(s/square root of n)