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Chapter 8: Q. 38 (page 496)

Teens" online profiles Describe a possible source of error that is not included in the margin of error for the 95% confidence interval in Exercise 36

Short Answer

Expert verified

There are 3possible sources of errors.

Step by step solution

01

Concept Information

Showing the possible sources of error that are not included in the margin of error.

02

Explanation

Three different causes of error are not taken into consideration by the margin of error (because the margin of error only measures the sampling error).

Due to selection bias, a segment of the population will be omitted.

When a process is utilized that yields findings that differ from the true value, response bias is measured (could be caused by people answering untruthfully).

When there isn't enough data for everyone in the sample, nonresponse bias occurs.

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Most popular questions from this chapter

Use Table B to find the critical value t* that you would use for a confidence interval for a population mean M in each of the following situations. If possible, check your answer with technology.

(a) A 98% confidence interval based on n=22observations.

(b) A 90%confidence interval from an SRS of 10observations.

(c) A 95% confidence interval from a sample of size7.

One reason for using a tdistribution instead of the standard Normal curve to find critical values when calculating a level C confidence interval for a population mean is that

(a) zcan be used only for large samples.

(b) zrequires that you know the population standard deviation 蟽.

(c) zrequires that you can regard your data as an SRS from the population.

(d) the standard Normal table doesn't include confidence levels at the bottom.

(e) a zcritical value will lead to a wider interval than a tcritical value.

93% confidence Find z*fora93%confidence interval using Table A or your calculator. Show your method.

In a poll,

I. Some people refused to answer questions.

II. People without telephones could not be in the sample.

III. Some people never answered the phone in several calls.

Which of these sources is included in the 卤2%margin of error announced for the poll?

(a) I only

(b) II only

(c) III only

(d) I, II, and III

(e) None of these

Many television viewers express doubts about the validity of certain commercials. In an attempt to answer their critics, Timex Group USA wishes to estimate the proportion of consumers who believe what is shown in Timex television commercials. Let prepresent the true proportion of consumers who believe what is shown in Timex television commercials. What is the smallest number of consumers that Timex can survey to guarantee a margin of error of 0.05or less at a 99%confidence level?

(a) 550

(b) 600

(c) 650

(d) 700

(c)750
See all solutions

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