Week 1
Week 2
Week 3
Terminology
Misc Trivia
100
A ______ variable places an individual into one of several distinct groups.
Categorical
100
What is the formula for finding a Z-score?
(X - μ) / σ
100
In a certain year scores on one part of the SAT follow the normal distribution N(504, 111). What score corresponds to z = -1.73?
x = 312
100
A researcher wants to use education level to explain differences in income.
What is the explanatory variable? What is the response variable?
Explanatory: Education level
Response: Income
100
Explain the difference between a cluster and stratisfied sampling method
Both involve breaking population into groups.
Stratified takes proportional representation (H of R)
Cluster takes all individuals in selected group(s)
200
What proportion of individuals are between the ages of 20 and 40?
0.3 or 30%
200
In a certain year scores on one part of the SAT follow the normal distribution N(504, 51). What is the z-score for a test score of 555?
z = 1
200
What are the Calculator and Excel functions for converting a z-score to a proportion (list both).
normalcdf and norm.S.dist
200
__________ is when individuals are inclined to supply incorrect information
Response bias
200
Finish the famous movie quote:
"This is the ____ of a _____, Bella"
"This is the skin of a killer, Bella"
- Twilight
300
What kind of chart is depicted?
Bar Graph
300
In a normal distribution, what is the probability that a randomly selected data point falls within two standard deviations above the mean?
47.5%
(68, 95, 99.7% rule)
300
Scores on an exam follow N(81, 5). How high must a student score in order to place in the top 10% of all students.
87.4
300
Name the types of bad sampling designs.
(that we talked about)
- Convenience (the easiest to reach)
- Voluntary response (opt-in surveys & studies)
300
When was the last time the US landed on the moon?
1972 (Apollo 17)
400
In the 5-number summary of a data set, what percent of individuals have scores lying between Q1 and MAX?
75%
400
Describe (or draw) the density curve of the outcome of rolling a 6-sided die
400
Scores on an exam follow N(76, 6). If a student scored a 92, what percentage of students scored higher than them?
0.4%
400
A __________ is a variable that is not included in the response or explanatory variables, but can influence the interpretation of relationships between the variables.
Lurking or Confounding Variable
400
Name one of the top 3 most streamed albums in 2025
Bad Bunny’s DeBÍ TiRAR MáS FOToS
KPop Demon Hunters Soundtrack
Billie Eilish’s HIT ME HARD AND SOFT
500
Calculate IQR and determine if there are any outliers
{12, 23, 34, 45, 54, 56, 67, 78, 89, 98}
IQR=44
44 x 1.5 = 66
34-66=-32
66+78=144
[-32,144]
No outliers
500
Use the 68-95-99.7 rule to approximate what proportion of observations in a N(15, 3) distribution fall between 12 and 21.
81.5%
500
A final exam has scores with a distribution that is roughly N(77, 12). Letter grades are assigned according to the usual rule (90 and above A’s, 80 to 90 B’s, etc.) What portion of students got a B?
26.2%
500
A group of researchers wants to know about the behavior of individuals in a certain region with arthrogryposis (a condition in which joints may be less flexible, or entirely inflexible). 685 individuals with the disease have been contacted, 411 of whom identify as male. The researchers use a random number generator to select 60 men and 40 women from the population. What kind of sample is being taken.
Stratified random sample
500
What is atomic number 8 on the periodic table
Oxygen