EXAM 2 REVIEW

Question 1

Step 1 of running a ttest is to state the null and research hypothesis

Accepted Answer

False

Question 2

What is the difference between a one sample and two sample t-test? Which is true of a one-sample below?

Accepted Answer

do nursing students have higher gpa on average compared to UNCW population, t-test looks to determine if the sample is different than the population

Question 3

Which is an example of probability sampling?

Accepted Answer

systematic random sample, stratified random sample, cluster sample

Question 4

Which measures of central tendency do you use for interval-ratio?

Accepted Answer

mode, median, mean

Question 5

Which is true in relation to an interval estimate?

Accepted Answer

consist of a range of values, calculated using margin of error

Question 6

Which of the following is a property of the sampling distribution?

Accepted Answer

normal in shape, has a standard deviation equal to the population SD divided by the √ of N, Has a mean equal to the population mean (μ)

Question 7

This graphic is a.....

Accepted Answer

multiple univariate statistics

Question 8

Which is true relating to a z-score?

Accepted Answer

its the critical region, ±1.96, expresses raw score in terms of standard deviation units

Question 9

From this table we can see....

Accepted Answer

a crosstabulation of type of offense based on police district

Question 10

Which is NOT a step in running a ttest?

Accepted Answer

begin with a difference between sample statistics (means or proportions)

Question 11

What is a Type II error?

Accepted Answer

The error of failing to reject H0 when H0 is false

Question 12

What is the purpose of a sample?

Accepted Answer

it saves time, money, and other resources while getting high-quality data

Question 13

Statistica are mathematical characteristics of samples

Accepted Answer

True

Question 14

Random and Haphazard are different.

Accepted Answer

True

Question 15

Samples must be representative of the population.

Accepted Answer

True

Question 16

When do you reject the null hypothesis?

Accepted Answer

when you are answering "yes" and you support the alternate hypothesis

Question 17

If p<a then we fail to reject the null hypothesis

Accepted Answer

False

Question 18

What is the importance of the Central Limit Theorem?

Accepted Answer

it removes the constraint of normality in the population

Question 19

What of the following regard the First Theorem?

Accepted Answer

tells us the shape of the sampling design, defines its mean and standard deviation

Question 20

Which is an example of a point estimate in this photo?

Accepted Answer

43% a great deal/quite a bit..., 63% of Americans say harm to people in the US from climate change...

Question 21

What information do you gain from sampling distributions (SD) of the mean?

Accepted Answer

information on the measure of variability among sample means, the mean of the population will have exactly the same value as the SD

Question 22

When do you know there is a skewed distribution?

Accepted Answer

when the median is reported as the measure of the center, mean is pulled in the direction of the skewness

Question 23

Which is true from the Schreck, McGloin, & Kirk reading on neighborhoods?

Accepted Answer

found social disorgainzation fuels both violent and nonviolent crime, they received their structural data from the US census

Question 24

What type of skewed distribution is this?

Accepted Answer

positively skewed

Question 25

Non-probability sampling is scientifically more acceptable.

Accepted Answer

False

Question 26

Probability Sampling is where...

Accepted Answer

random selection of cases with a known probability of being included

Question 27

Statistical significance & importance are the same thing

Accepted Answer

False

Question 28

The difference is caused by random chance...

Accepted Answer

is null hypothesis

Question 29

What&#x27;s wrong with this visualization of data?

Accepted Answer

lack of percentages, there is no way to determine if this is an accurate representation of data, have to jump back and forth from legend to graph without other information

EXAM 2 REVIEW

Questions 29

EXAM 2 REVIEW

Questions 29