Molly uses the school directory to select, at random, 25 students from her school for a survey on which sports people like to watch on television. She calls the students and asks them, “Do you think basketball is the best sport to watch on television?”

a. Did Molly survey a random sample or a biased sample of the students at her school?

b. Was the question she asked an unbiased question? Explain your answer.

There are 2,300 licensed dogs in Clarkson. A random sample of 50 of the dogs in Clarkson shows that 8 have ID microchips implanted. How many dogs in Clarkson are likely to have ID microchips implanted?

A store gets a shipment of 500 MP3 players. Twenty-five of the players are defective, and the rest are working. A graphing calculator is used to generate 20 random numbers to simulate a random sample of the players.

A list of 20 randomly generated numbers representing MP3 players is :

a. Let numbers 1 to 25 represent players that are _____

b. Let numbers 26 to 500 represent players that are _____

c. How many players in this sample are expected to be defective?

d. If 300 players are chosen at random from the shipment, how many are expected to be defective based on the sample? Does the sample provide a reasonable inference? Explain.