AP STATS end of the year Final WS

Question 1

A 90% confidence interval is wider or narrower than a 95% interval?

Accepted Answer

Narrower

Question 2

A researcher wants to reduce variability between groups. What design should be used?

Accepted Answer

Blocking

Question 3

What is the purpose of a confidence interval for a proportion?

Accepted Answer

Estimate the population proportion

Question 4

Two samples have means of 80 and 74. What is the difference in sample means?

Accepted Answer

6

Question 5

Use normal CDF, -100 to 100. SD of 5 and Mean of 30, what do you get?

Accepted Answer

1

Question 6

As sample size increases, the sampling distribution of the mean:

Accepted Answer

Becomes more normal

Question 7

When should you use a t-distribution instead of a normal distribution?

Accepted Answer

When you're estimating a population mean and the population SD is unknown.

Question 8

If a data point has a z-score of -2, it means:

Accepted Answer

It is two standard deviations below the mean

Question 9

What does 𝐴𝐶 represent in Stats probability?

Accepted Answer

Compliment of A

Question 10

Which of the following best describes a stratified sample?

Accepted Answer

Groups are formed by a variable, and samples are taken from each

Question 11

What is the 4-step procedure

Accepted Answer

State Plan Do Conclude

Question 12

The range of the data set {17,12,20,33,25 } is:

Accepted Answer

21

Question 13

What are the traits of a good statistic?

Accepted Answer

Low variability and low bias

Question 14

what is the formula for confidence intervals?

Accepted Answer

x̄ ± z * (σ / √n)

Question 15

What does a correlation (r) of -0.95 tell you?

Accepted Answer

There is a strong negative linear relationship

Question 16

Noak's SAT score is at the 78th percentile. What does that mean?

Accepted Answer

Noak scored higher than 78% of test takers.

Question 17

In a linear regression model predicting height from age, the slope is 1.67. What does this mean?

Accepted Answer

For each additional year of age, height increases 1.67 units on average.

Question 18

Which formula is used for large counts

Accepted Answer

n * p̂ ≥ 10 and n * (1 - p̂) ≥ 10

Question 19

what is the probability you will get a 1 or a 2 when you roll two dice?

Accepted Answer

1/3

Question 20

What does the Law of Large Numbers say?

Accepted Answer

As the sample size increases, the sample mean gets closer to the pop. mean

Question 21

Sample of 36 students, mean = 75, SD = 6. What is the standard error?

Accepted Answer

1

Question 22

The 95% confidence interval for a certain mean is (42, 48). What is the samplemean?

Accepted Answer

45

Question 23

What is the name of the value compared to alpha in a significance test?

Accepted Answer

p -value

Question 24

Which measure is best to describe the center (location) of a skewed distribution?

Accepted Answer

Median

Question 25

What is the sum of the probabilities of all outcomes in a sample space?

Accepted Answer

1

Question 26

If a 5 number summary is listed as: 5, 12, 27, 32, and 45. What is the IQR?

Accepted Answer

20

Question 27

In a sample of 250 people, 80 prefer chocolate. What is the sample proportion?

Accepted Answer

0.32

Question 28

Which statistic is most resistant to outliers?

Accepted Answer

Median

Question 29

What is the goal of inference for two variables in statistics?

Accepted Answer

To estimate or test a relationship or diference btw two groups or variables

Question 30

What is sampling bias?

Accepted Answer

When data doesn't represent the larger population that it was taken from.

Question 31

What does the 68% mean in the 68-95-99.7 rule on a Normal Curve!

Accepted Answer

68% of the data is with in 1 z-score of the mean

Question 32

Which of the following is NOT a principle of experimental design?

Accepted Answer

Placebo

Question 33

How do you find an outlier?

Accepted Answer

Q1 - 1.5 * IQR or Q3 + 1.5 * IQR

Question 34

What does a residual represent?

Accepted Answer

The difference between actual and predicted value

Question 35

What is the large counts for a goodness of fit test?

Accepted Answer

>5

Question 36

What does the standard deviation represent

Accepted Answer

how much the provided score deviates from the mean

Question 37

What does MoE stand for?

Accepted Answer

Margin of Error

Question 38

What do Ho stand for?

Accepted Answer

The Null

Question 39

Does a box plot show what the middle line represents?

Accepted Answer

Median

Question 40

In what case do we reject the null hypothesis with our alpha level at .05?

Accepted Answer

p=.0001

Question 41

What is a type I error?

Accepted Answer

When you reject the null hypothesis, but it is true

Question 42

What is the probability you will get a 5 and a 6 when you roll the dice.

Accepted Answer

1/36

Question 43

What value of r indicates a perfect NEGATIVE linear relationship?

Accepted Answer

-1

Question 44

What is the purpose of doing inference for means in statistics?

Accepted Answer

To estimate or test a claim about a population mean using sample data

Question 45

Two coins are flipped. What is the probability of getting exactly two heads?

Accepted Answer

0.25

Question 46

How do you find the Chi-Square (χ2) value?

Accepted Answer

χ2 = ∑(Observed - Expected)^2/Expected

Question 47

What is a simple random sample (SRS)?

Accepted Answer

Every individual has an equal chance of being chosen

Question 48

What is the difference between p and p-hat?

Accepted Answer

p is a population proportion; p-hat is a sample proportion

Question 49

Which test is used to compare two independent means?

Accepted Answer

Two-sample t-test

Question 50

What condition must be met to use a normal model for a proportion?

Accepted Answer

np ≥ 10 and n(1-p) ≥ 10

AP STATS end of the year Final WS

Questions 50

AP STATS end of the year Final WS

Questions 50