Exam 1 Closed Book

Question 1

A frequency distribution of several mean values is called

Answer 1

a sampling distribution

Question 2

With inferential statistics we can use

Answer 2

𝑥̅ to estimate μ and sample statistics to estimate population parameters

Question 3

A standard error

Answer 3

relates to how much uncertainty there is in an estimate of the population mean

Question 4

Type II error is

Answer 4

accepting the H0 when it’s false

Question 5

a frequency distribution of several mean values is

Answer 5

a sampling distribution

Question 6

if a value is selected a priori, the value has been selected

Answer 6

based on already known, pre-determined info

Question 7

In relation to variance, the standard deviation

Answer 7

returns the sample to its original units

Question 8

An example of nominal scale data is

Answer 8

hair color

Question 9

A measure of central tendency includes

Answer 9

the mean, mode, median

Question 10

p-value is the probability

Answer 10

of obtaining sample statistic from a population in which null hypothesis is true.

Question 11

Ordinal scales involve

Answer 11

ranks

Question 12

In inferential statistics we use sample statistics to

Answer 12

estimate population parameters

Question 13

An example of ordinal-scale data is

Answer 13

weight classes

Question 14

An example of interval-scale data is

Answer 14

temperature

Question 15

An example of ratio-scale data is

Answer 15

length or volume

Question 16

population means are represented by

Answer 16

mu

Question 17

sample means are represented by

Answer 17

x bar

Question 18

A p-value is

Answer 18

the probability of obtaining your sample data and statistics from a population in which the null hypothesis is true

Question 19

The test that deals with two nominal-scale variables

Answer 19

contingency table

Question 20

Expected frequencies in contingency tables are

Answer 20

calculated ( a posteriori)

Question 21

What two tests must be done before continuing with a contingency table?

Answer 21

R and B rule and category size

Question 22

Measures of dispersion include

Answer 22

the range, sum of squares, variance, standard deviation and coefficient of variation

Question 23

The standard deviation of the sampling distribution is

Answer 23

the standard error

Question 24

According to central limit theorem

Answer 24

the means of samples from a normally distributed population will be normally distributed as well; and samples from any distribution will have means that approach normal distributions as the sample size increases.

Question 25

What do we use to estimate how much uncertainty there is in the sample estimate of the population mean

Answer 25

standard error

Question 26

Which test determines the probability that a sample of ratio-interval scale data was taken from a population with a pre-determined mean

Answer 26

a one-sample t-test

Question 27

The two assumptions for two-sample tests

Answer 27

RSNDP and homoscedastic

Question 28

Robust means

Answer 28

violations of assumptions do not affect results of test

Question 29

The test that deals with ranking data in order to convert it to ordinal-scale data is

Answer 29

Mann-Whitney U

Question 30

The test that compares the mean difference between two paired samples of ratio-interval scale data to zero is

Answer 30

a paired-sample t-test