True or false, areas under the standard normal curve cannot be ...

[james9437]

True or false, areas under the standard normal curve cannot be negative, whereas z-scores can be positive or negative.
 
  A) True B) False

Question 2

Before opening a new dealership, an auto manufacturer wants to gather information about car ownership and driving habits of the local residents.
 
  The marketing manager of the company randomly selects 1000 households from all households in the area and mails a questionnaire to them. Of the 1000 surveys mailed, she receives 140 back. Determine the type of bias.

[peilian]

Answer to Question 1

A

Answer to Question 2

Nonresponse bias

[james9437]

Thanks for the timely response, appreciate it

[zacnyjessica]

Excellent