AP Statistics Exam Questions
and Answers Verified Solutions
Latest Update (2026/2027)
Question:
How do you check if there is outliers?
Answer:
calculate IQR; anything above Q3+1.5(IQR) or
below Q1-1.5(IQR) is an outlier
Question:
If a graph is skewed, should we calculate the median or the mean? Why?
Answer:
median; it is
resistant to skews and outliers
Question:
If a graph is roughly symmetrical, should we calculate the median or the
mean? Why?
Answer:
mean; generally is more accurate if the data has no outliers
,Question:
What is in the five number summary?
Answer:
Minimum, Q1, Median, Q3, Maximum
Question:
Relationship between variance and standard deviation?
Answer:
Question:
variance=(standard
deviation)^2
variance definition
Answer:
Question:
the variance is roughly the average of the squared differences
between each observation and the mean
standard deviation
Answer:
the standard deviation is the square root of the variance
,Question:
What should we use to measure spread if the median was calculated?
Answer:
IQR
Question:
What should we use to measure spread if the mean was calculated?
Answer:
standard
deviation
Question:
What is the IQR? How much of the data does it represent?
Answer:
Q3-Q1; 50%
Question:
How do you calculate standard deviation?
Answer:
1. Type data into L1
2. Find mean with 1 Variable Stats
3. Turn L2 into (L1-mean)
, 4. Turn L3 into (L2)^2
5. Go to 2nd STAT over to MATH, select sum(
6. Type in L3
7. multiply it by (1/n-1)
8. Square root it
Question:
What is the formula for standard deviation?
Answer:
Question:
Categorical variables vs. Quantitative Variables
Answer:
Categorical: individuals can be assigned
to one of several groups or categories
Quantitative: takes numberical values
Question:
If a possible outlier is on the fence, is it an outlier?
Answer:
No
Question:
and Answers Verified Solutions
Latest Update (2026/2027)
Question:
How do you check if there is outliers?
Answer:
calculate IQR; anything above Q3+1.5(IQR) or
below Q1-1.5(IQR) is an outlier
Question:
If a graph is skewed, should we calculate the median or the mean? Why?
Answer:
median; it is
resistant to skews and outliers
Question:
If a graph is roughly symmetrical, should we calculate the median or the
mean? Why?
Answer:
mean; generally is more accurate if the data has no outliers
,Question:
What is in the five number summary?
Answer:
Minimum, Q1, Median, Q3, Maximum
Question:
Relationship between variance and standard deviation?
Answer:
Question:
variance=(standard
deviation)^2
variance definition
Answer:
Question:
the variance is roughly the average of the squared differences
between each observation and the mean
standard deviation
Answer:
the standard deviation is the square root of the variance
,Question:
What should we use to measure spread if the median was calculated?
Answer:
IQR
Question:
What should we use to measure spread if the mean was calculated?
Answer:
standard
deviation
Question:
What is the IQR? How much of the data does it represent?
Answer:
Q3-Q1; 50%
Question:
How do you calculate standard deviation?
Answer:
1. Type data into L1
2. Find mean with 1 Variable Stats
3. Turn L2 into (L1-mean)
, 4. Turn L3 into (L2)^2
5. Go to 2nd STAT over to MATH, select sum(
6. Type in L3
7. multiply it by (1/n-1)
8. Square root it
Question:
What is the formula for standard deviation?
Answer:
Question:
Categorical variables vs. Quantitative Variables
Answer:
Categorical: individuals can be assigned
to one of several groups or categories
Quantitative: takes numberical values
Question:
If a possible outlier is on the fence, is it an outlier?
Answer:
No
Question:
