HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP HELP THE ARE 2 QUESTIONS
Question 1.
(MULTIPLE CHOICE: MORE THAN ONE IS RIGHT)

The manager of a sawmill wants to find out what percentage of the boards that the mill produced are defective.

Which sampling methods are likely to be biased?

Select each correct answer.

The manager sends an email to 20 customers who buy lumber from the mill, asking each how many of the boards they bought the past week were defective. Results from the first 5 customers to respond are tallied.

On 1 day, an hour after the sawmill begins production, 30 boards in a row are selected and examined.

Every 40th board produced over the course of 1 week is selected and examined.

The manager selects 20 boards at random each day for 5 days and examines them.

2ND QUESTION
A radio talk show host asks listeners to call the radio station and give their opinions on a proposed new city ordinance. He uses the opinions of 200 callers to conclude that the voters are overwhelmingly opposed to the ordinance.

Why is this sample likely to be biased?

The entire population of the city was not surveyed.

Radio listeners are more likely to be opposed to city ordinances.

There are not enough people in the sample.

The survey is voluntary and includes only listeners of this radio program.

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