Statistics Review 2 (Topics 5 - 7)

One hundred and thirty-two individuals were selected at random and asked which brand of car they preferred.  They were then sorted by age. 

What is the probability that a person, selected at random, is in the 18-34 age group? Write your answer as a decimal rounded to four places.

One hundred and thirty-two individuals were selected at random and asked which brand of car they preferred.  They were then sorted by age. 

What is the probability that a person, selected at random, prefers Toyota? Write your answer as a decimal rounded to four places.

One hundred and thirty-two individuals were selected at random and asked which brand of car they preferred.  They were then sorted by age. 

What is the probability that a person, selected at random, is in the 35 - 49 age group and prefers Nissan? Write your answer as a decimal rounded to four places.

One hundred and thirty-two individuals were selected at random and asked which brand of car they preferred.  They were then sorted by age. 

What is the probability that a randomly selected person prefers Honda, given that they are in the 18 - 34 age group? Write your answer as a decimal rounded to four places.

One hundred and thirty-two individuals were selected at random and asked which brand of car they preferred.  They were then sorted by age. 

What is the probability that a person, selected at random, is in the 50 - 65 age group or prefers Toyota? Write your answer as a decimal rounded to four places.

One hundred and thirty-two individuals were selected at random and asked which brand of car they preferred.  They were then sorted by age. 

Does there appear to be an association between a person's age and what brand of car they prefer?

• Yes; A person's age and car brand preference seem to be associated because there is variation in the data.

• No; A person's age and car brand preference are independent.

N(0, 1)

Which of the following are properties of a Normal Distribution? Choose all that apply.

• symmetric

• bell-shaped

• positively skewed

• negatively skewed

• unimodal

What is the value of the mean of this Normal Curve?

What is the standard deviation of this Normal Curve?

This data is normally distributed. What percent of the data is in the shaded region?

• 50%

• 68%

• 95%

• 99.7%