Shapes of Distributions
The name for a distribution where the left and the right sides are approximately the same.
Symmetric
What is the middle value of a data set called?
Median
The minimum value possible for the correlation coefficient (r) is…
-1
P(A or B) = ?
P(A) + P(B) - P(A and B)
How many questions will be on your test?
30
Positive skew is also known as…
Right skew
When should you use the median instead of the mean to measure the center of a data set?
When it is skewed
2 variables with a correlation coefficient (r) of 0.85 would have what type of relationship?
Strong positive
P(A|B) = ?
P(A and B) / P(B)
Are you allowed a cheat sheet?
Yes. Same size as last test.
When a distribution is skewed left the mean will be …. the median.
Less than
What measure of spread is used if the center is described using median?
IQR
Give an example correlation coefficient of a distribution with a moderate negative relationship.
-0.7 < r < -0.4
If P(A and B) = 0, we know the 2 events are …
Mutually Exclusive
Do you need a calculator for this exam?
Yes… preferably a 580 (570’s can’t do a few of the functions)
What proportion of the data from a normal distribution falls within 1 standard deviation of the mean?
68%
What numbers are included in the 5-number summary?
Min, 1st Quartile, Median, 3rd Quartile, Max
Draw a scatter plot that would have a strong negative linear correlation
compact and sloped downward
When to use nPr vs nCr?
When the order is important (123 =/= 321)
How many colors of camels were there in Camel Up?
7
Red, blue, green, purple, yellow, black, white
A distribution is ~N with a mean of 58 and a SD of 11. What 4 things would you input into your calculator’s if you wanted to find the probability that a data point lies between 44 and 67?
Lower Bound - 44, Upper Bound - 67, mean 58, and SD 11
What function(s) are used on your calculator to find the standard deviation of a data set?
Stats -> 1-Var Stats
Draw a scatter plot with a nonlinear relationship
something curved?
How many was can the letters of “correct” be rearranged to make a password such that it begins and ends with ‘r’? (there’s a trick)
60. 5 non-r letters = 5!, but the 2 c’s mean we double count some passwords. Divide by 2!.
r c1 o e c2 t rr c2 o e c1 t r
Which subjects do I teach here at Wellspring?
AP Stats, Probability and Stats, Algebra 2