AP Stat Semester

The two way table represents a set of marbles.

Find the probability of randomly drawing a large or small, given that the marble is black

• 0.35

• 0.28

• 0.22

• 0.20

• 0.80

You take a 100-question multiple choice test. Each question has five choices, and you guess at each question. Which of the following calculator commands would give you the probability of getting at least 30 questions correct?

• 1-binompdf(100,0.2,29)

• binomcdf(100,0.2,29)

• binomcdf(100,0.2,30)

• 1-binomcdf(100,0.2,30)

• 1-binomcdf(100,0.2,29)

You roll a six sided die, what is the probability of getting the first 4 in at most 5 rolls?

• 0.0804

• 0.5177

• 0.5981

• 0.9994

• 0.0539

For a normal distribution with a mean of 25 and a standard deviation of 4, what is the value at the 1st quartile?

• 25.668

• 21

• 25

• 27.69

• 22.3

P(x)= 0.25  P(y)= 0.3  X and Y are independent.  What is P(X or Y)

• 0.55

• 0.475

• 0.025

• unknown

If it is known that 750 out of 2000 people will contract a certain disease when exposed to it through direct contact, what is the probability that out of the next 100 people exposed, a majority of them will contract it?

• 0.8654

• 0.99594

• 0.004057

• 0.1346

• 0.2545

Which list has the smallest standard deviation?

• 1 2 3 4 5 6 7

• 3 3 3 3 3 3

• 2 2 2 6 6 6

• 2 9 9 9 9 9

Which transformation would not affect the variance/standard deviation (Select 2 that apply)

• Adding 5 to each number

• Squaring each number

• Doubling each number

• Multiplying each number times -1

The amount by which the predicted value of y changes when x increases by 1 unit.

• Slope

• Y Intercept

• Correlation

• Residual

When conducting a regression analysis on data, you get a correlation coefficient of r= -0.855 What should you conclude?

• There is a weak negative relationship between x and y

• There is a strong negative relationship between x and y

• -85.5% of the variation of y is explained by the variation in x

• There is no relationship between the variables

• There is a strong positive relationship between x and y