Unit 1
What do we call variables that are represented by numbers?
Quantitative
What do we know about the correlation of two variables that has an r of -.96
they have a STRONG NEGATIVE correlation
What do we call the "fake" pill?
Placebo
What is the probablity of Ac if P(A) = 0.6
0.4
What is the probability of landing with in 1 standard deivation of the mean in either direction?
68%
What shape is a distribution if the mean is 8 and the median is 10?
Skewed Left
what do you call a point that is far from the data but does not necesarily go agains the trend
high-leverage point
What type of sample gives every person in the population an equally likely chance to be chosen? (often shown by pulling names out of a hat)
Simple Random Sample (SRS)
How do we know if 2 events are independent
P(A)*P(B) = P(A and B)
P(A|B) = P(A)
same proportion in 2-way table
one event happening does not affect the probability of the other event happening
What does it mean for 2 variables to have a negative correlation
As one increases, the other tends to decrease
The distibution of scores in AP Stats is aproximatey normal with a mean of 80 and standard deviation of 5, What is the z-score for a person who earns an 87?
z= 7/5 or 1.4
For a linear model to be a good fit, what must be true about the residial plot
It must have NO PATTERN
What is the type of experiment when subjects are split into non-overlapping groups on a characteristic that might impact the outcome of the experiment?
Blocking
The probability of a person owning a dog if 55%. Find the probability that the first person you find who owns a dog is the 3rd person you sample.
0.111375
What sampling method seperates the population into groups based on location, then randomly chooses an entire group(s) to be a part of their sample?
Cluster Sample
Rank the following distributions from lowest to highest standard deviation without a calculator.
A. 1, 2, 3, 4, 5, 6, 7, 8
B. 100, 100, 100, 100, 100, 100
C. -10, -10, -10, 0, 0, 0, 10, 10, 10
D. -10, -8, -6, -4, -2, 0, 2, 4, 6, 8, 10
B, A, D, C
Calculate the residual of a point that has an x of 5 and a y of 20 when the line of best fit is
y-hat = 5x-3
-2
What do you call a variable that may throw off results in an experiment
Confouding Variable
If the standard deviation of x = 4 and the standard deviation of y = 3, what is sigma of (x+y)?
5
Mr. Purvis flips a coin 10 times, what is the probability that he gets heads 6 or more times? (at least 6)
0.377
What are the cutoff for outliers if the min = 3, Q1 = 6, Med = 10, Q3 = 15 and Max = 15?
-7.5 and 28.5
What 5 things are necesary to include when desrcibing an association bettween 2 variables
Direction
Unusual Features
Form
Strength
CONTEXT!
What are the 4 components of experimental design? (you must have all 4 correct to earn the points)
1. Randomization
2. Replication
3. Control
4.comparison
For the biniomial distribution there are 4 requirements. Name all 4 (you must have all correct to earn the points)
1. Binary (Only 2 outcomes)
2. Independent Events
3. Set number of trials (n)
4. Same Probability each time
What score do you need on the AP exam to get a 5?
At least a 68%