Statistics Review

Question 1

Three cards are drawn from a deck. What's the probability all are clubs?

Accepted Answer

Neither

Question 2

Which of the following words does NOT describe the shape?

Accepted Answer

Skewed

Question 3

What is the expected value of the number of pets a student owns?

Accepted Answer

1.1

Question 4

Which of the following is defined as the average value of a set of data?

Accepted Answer

mean

Question 5

Interpret the expected value of a single roll of a six-sided die.

Accepted Answer

The long-run average of a single roll is 3.5.

Question 6

Which of these measures the spread of the middle 50% of values in a data set?

Accepted Answer

Interquartile Range

Question 7

What's the probability that the first time a coin lands TAILS is the fourth toss?

Accepted Answer

Geometric

Question 8

What is the expected value of the roll of a single six-sided die?

Accepted Answer

3.5

Question 9

The 90% conf. interval for the proportion of students who can drive is (.30, .40). Interpret.

Accepted Answer

I'm 90% confident between 30% and 40% of students can drive.

Question 10

In a skewed-right distribution, which of the following is true about the mean and median?

Accepted Answer

Mean > Median

Question 11

Three cards are drawn from a deck. What's the probability all are clubs?

Accepted Answer

(13/52)(12/51)(11/50)

Question 12

Which is correct?

Accepted Answer

A good statistic estimates a parameter.

Question 13

What's the probability that the first time a coin lands TAILS is the fourth toss?

Accepted Answer

(0.5)3(0.5)1

Question 14

In a skewed-left distribution, which of the following is true about the mean and median?

Accepted Answer

Mean < Median

Question 15

What's the probability of flipping two heads in a row on a coin?

Accepted Answer

25%

Questions 15