unit 1-13 quiz game

Question 1

NOT a chi-square condition:

Accepted Answer

Normal population

Question 2

Standard Deviation of Residuals:

Accepted Answer

s; prediction error between actual & predicted y

Question 3

researcher observes/measures characteristics of a population w/out changing existing characteristics-observational study

Accepted Answer

True

Question 4

What does the slope in a regression equation represent?

Accepted Answer

The predicted change in y for a one-unit increase in x

Question 5

Conditional Probability:

Accepted Answer

Given another event occurred

Question 6

CI formula (t-distribution):

Accepted Answer

xˉ±t∗⋅snxˉ±t∗⋅n​s​

Question 7

A scatter plot shows the relationship between:

Accepted Answer

Two quantitative

Question 8

Define Data

Accepted Answer

information coming from observations, counts, measurements, or responses

Question 9

Probability Model:

Accepted Answer

Process: sample space + outcome probabilities

Question 10

Chi-square ↑ when observed ≠ expected: True

Accepted Answer

True

Question 11

What is the purpose of a significance test for the slope in a linear regression?

Accepted Answer

To determine if the slope is equal to zero in the population

Question 12

Graph small n < 30 if shape unknown:

Accepted Answer

True

Question 13

What is a Type I error in the context of hypothesis testing?

Accepted Answer

Rejecting a true null hypothesis

Question 14

Purpose of GOF test:

Accepted Answer

Match observed vs. expected

Question 15

What is a Bar Graph?

Accepted Answer

Even bars

Question 16

u9

Accepted Answer

True

Question 17

Symbol for intersection ("and"):

Accepted Answer

∩

Question 18

CI (+, +) for difference of means:

Accepted Answer

Mean 1 > Mean 2

Question 19

Which of the following is not a required condition for constructing a confidence interval for a proportion?

Accepted Answer

The population standard deviation is known

Question 20

If a p-value is greater than the significance level, we reject the null hypothesis.

Accepted Answer

False

Question 21

What is a Stem-and-Leaf Display?

Accepted Answer

Groups/retrieves quantitative data

Question 22

Two variables must be quantitative for correlation:

Accepted Answer

True

Question 23

Use paired t-test when:

Accepted Answer

Paired or matched subjects

Question 24

Which condition must be met to use a normal model for significance testing for a proportion?

Accepted Answer

Both np≥10 and n(1−p)≥10

Question 25

t-distribution gets wider as n ↑:

Accepted Answer

False

Question 26

a sample is a subset of a population

Accepted Answer

True

Question 27

The null hypothesis in a slope significance test is always H0:β=0

Accepted Answer

True

Question 28

u9

Accepted Answer

False

Question 29

When constructing a confidence interval for the difference of two proportions, which of the following is true?

Accepted Answer

Each sample must meet the conditions separately

Question 30

u8

Accepted Answer

True

Question 31

Chi-square is symmetric like normal curve:

Accepted Answer

False

Question 32

Conditions for CI for mean:

Accepted Answer

Random, 10%, Normal/large n

Question 33

Increasing the sample size will result in a wider confidence interval, assuming the same confidence level.

Accepted Answer

False

Question 34

Individuals self-select by responding:

Accepted Answer

Voluntary response

Question 35

Horizontal axis of a scatter plot:

Accepted Answer

Explanatory

Question 36

Interviewer's traits affect answers:

Accepted Answer

Response bias

Question 37

p-value meaning:

Accepted Answer

Chance of result if H₀ is true

Question 38

Define Population

Accepted Answer

collection of all outcomes responses measurements or counts of interest

Question 39

What is a Frequency Histogram?

Accepted Answer

Shows frequency ratio/percent

Question 40

Two-sided HA tests only "greater than":

Accepted Answer

False

Question 41

Which of the following is NOT a condition for performing inference on slope?

Accepted Answer

Population mean is known

Question 42

Sample of easy-to-reach individuals:

Accepted Answer

Convenience

Question 43

p-value < α ⇒ reject H₀:

Accepted Answer

True

Question 44

Words that describe form:

Accepted Answer

Linear/non-linear

Question 45

Equal chance for all individuals:

Accepted Answer

Simple random (SRS)

Question 46

Sample Space (S):

Accepted Answer

All possible outcomes

Question 47

Ideal cluster in sampling:

Accepted Answer

Different within, similar between

Question 48

Test for association (1 sample, 2 variables):

Accepted Answer

Independence

Question 49

What is a Dotplot?

Accepted Answer

Dots for each value on one axis

Question 50

u8

Accepted Answer

0.40

Question 51

Probability:

Accepted Answer

. 0–1 value from long repetition

Question 52

Null hypothesis for comparing means:

Accepted Answer

μ1=μ2μ1​=μ2​

Question 53

What is the purpose of a significance test in statistics?

Accepted Answer

To use sample data to evaluate competing claims about population parameters

Question 54

what is a cluster sample

Accepted Answer

sampling technique where population falls into naturally occurring subgroup

Question 55

What is a Histogram?

Accepted Answer

Bars for ranges, no gaps

unit 1-13 quiz game

Questions 55

unit 1-13 quiz game

Questions 55