Chapter 3&4; testing a man, z/t-tests

Question 1

Standard Error of a statistic can be described as

Answer 1

the expected error of that statistic as an estimator for its parameter

Question 2

When testing a mean or proportion, the standard error is equivalent to the standard deviation of our

Answer 2

sample statistic

Question 3

A population distribution represents the

Answer 3

Entire distribution of a particular variable

Question 4

A sample data distribution is the

Answer 4

distribution of measurements collected from our sample

Question 5

As sample size increases, your sample distribution will converge in _____ to the _________________________

Answer 5

shape ; population distribution

Question 6

A sampling distribution is the general name for the ________________________________

Answer 6

distribution of a sample statistic

Question 7

As sample size increases, the sampling distribution of the sample mean will converge in ________ to the ____________________

Answer 7

value ; population mean

Question 8

Parametric tests assume the

Answer 8

Null Model will be normally distributed and use calculus to find the p-value precisely based on the position of our sample statistic relative to the distribution

Question 9

Every normally distributed variable can be defined by two values

Answer 9

1. the mean
2. the standard deviation

Question 10

z scores represent the

Answer 10

standardized position of values in a normal distribution

Question 11

Negative z scores mean the data point is

Answer 11

below the mean

Question 12

Positive z scores mean the data point is

Answer 12

above the mean

Question 13

The z score value represents

Answer 13

how many standard deviations the point is away from the mean

Question 14

z-test for a proportion

Answer 14

the distribution of p-hat is reasonably approximated by a normal distribution

Question 15

z-test for a mean

Answer 15

• sigma is known or well approximated with our sample (ex. when n>100)
• the distribution of x-bar is normally distributed

Question 16

t-test for a mean

Answer 16

• sigma is unknown and estimated by s
• the distribution of x-bar is normally distributed