True

False

Refer to the randomized systematic sample in the previous problem. The chance that each unit in the list is selected is

depends on the unit

1/10

1/100

The monthly Gallup Poll opinion survey is based on a sample of about 1,500 persons, “scientifically chosen as a representative cross section of the American public.”

The Gallup poll thinks that the sample is representative mainly because:

It resembles the population with respect to such characteristics such as race, sex, age, income, and education.

It was chosen using a probability method

A sorcerer has hidden an M&M in one of an infinite row of boxes. You need to find it as quickly as possible. As a matter of fact, you only have time to look in 11 boxes. The sorcerer says that he will give you a hint, by tossing a coin 100 times, and counting the number of heads, all in a flash. He will then tell you the sum of the number that the box is in, and the number of heads that he got out of 100 tosses.

If the sum is 75, you decide to look in boxes 20 through 30. What is the chance that you will locate the M&M? Choose the closest answer.

68%

73%

70%