Chapter 9.3, Problem 109E

(a)

To determine

To find: that the only phone is a cell phone.

Answer to Problem 109E

Not included

Explanation of Solution

The margin of error only includes sampling error:

There are three types of error that are NOT included in sampling error.

*Selection bias can excluded a part of the population

*Measurement or response bias can use a technique that provides completely different worth from the true value

*Non response bias is the results of not having knowledge for everyone within the sample.

Not all individuals has the chance to be within the sample, therefore the error is choice bias, that all know isn’t enclosed within the margin of error. .

(b)

To determine

To find: that the some people whose numbers were chosen never answered the phone in several calls or answered but refused to participate in the poll.

Answer to Problem 109E

Not included

Explanation of Solution

The margin of error only includes sampling error:

There are three types of error that are NOT enclosed in sampling error.

*Selection bias will excluded a part of the population

*Measurement or response bias can use a technique that provides completely different worth’s from the truth value

*Non response bias is that the results of not having knowledge for everyone within the sample.

Not every person in the sample responded, therefore the error is non-response bias, that all know isn’t enclosed within the margin of error.

(c)

To determine

To find: that there is chance variation in the random selection of telephone numbers.

Answer to Problem 109E

Included

Explanation of Solution

The margin of error only includes sampling error:

There are three types of error that are NOT enclosed in sampling error.

*Selection bias can excluded a part of the population

*Measurement or response bias can use a technique that provides completely different worth’s from the truth value

*Non response bias is that the results of not having knowledge for everyone within the sample.

The error is due to chance, that falls below sampling error and therefore the error is enclosed within the margin of error.