Chapter 6. Review

Identify the confidence interval used in the figure below if each shaded area is equal to 0.05.

• 90%
• 95%
• 98%
• 99%

• 7

• 72

• 65

• 79

• Neither random condition nor Large Count condition is met

• The Random condition is met for each sample and the Large Counts condition is also met for each sample.

• The Random condition is met for each sample but the Large Counts condition is not met for at least one sample.

• The Random condition is not met for each sample, but the Large Counts condition is met for each sample.

A survey of 280 homeless persons showed that 63 were veterans. Construct a 90% confidence interval for the proportion of homeless persons who are veterans.

• (0.167, 0.283)

• (0.184, 0.266)

• (0.176, 0.274)

• (0.161, 0.289)

When 410 college students were surveyed, 150 said they own their own car. Find a point estimate p the population proportion of students who own their cars.

• 0.577

• 0.366

• 0.268

• 0.634

The amount added and subtracted to the statistic.

• Margin of Error

• Point Estimator

• Statistic

• Population

Which of the following sources of error is included in the margin of error

• chance variation in choosing a random sample.
• undercoverage.
• some of the subjects did not understand the questions.
• voluntary response.

Which of the following changes to a study would result in a smaller confidence interval?

• increasing the confidence level, increasing the sample size

• increasing the confidence level, decreasing the sample size

• decreasing the confidence level, decreasing the sample size

• decreasing the confidence level, increasing the sample size.

A random sample of 100 WHS students found that 53 of them were in possession of a pencil. What is the p-hat for this sample?

• 0.53
• 0.5
• 0.47
• 1

: The chi-square statistic is similar to all other test statistics we have discussed  in that it compares observed values to values that would be expected if Ho were true. 

• True
• False