03. Practice 5.6 Confidence Intervals

If the 95% Confidence Interval for a population mean is from 114.56 to 125.54, then is it likely that the the mean (µ) is greater than 130?

• Yes

• No

• Not enough information

• I have no idea what you're asking of me

Which of the following is another way of representing the range 60.8% to 67.2%?

• 64 ± 3.2%

• 60 ± 0.8%

• 64 ± 0.2 %

• 67 ± 0.2%

A poll showed that 58% of people living in Canada know that the cost of living for the average Inuit is 50% higher than the cost of living for other Canadians. The results of the survey are considered accurate within ± 3.1%, 19 times out of 20. Which of the following represents the confidence level:

• 58%

• 3.1%

• 50%

• 95%

A poll showed that 58% of people living in Canada know that the cost of living for the average Inuit is 50% higher than the cost of living for other Canadians. The results of the survey are considered accurate within ± 3.1%, 19 times out of 20. Which of the following represents the margin of error:

• 58%

• 3.1%

• 50%

• 95%

A poll showed that 58% of people living in Canada know that the cost of living for the average Inuit is 50% higher than the cost of living for other Canadians. The results of the survey are considered accurate within ± 3.1%, 19 times out of 20. Which of the following represents the confidence interval:

• 58% ± 3.1%

• 3.1% ± 58%

• 50% ± 58%

• 95% ± 19%

A poll showed that 64% of grade 11 Math students reported better dental checkups after using Winterfresh Toothpaste. The results of the survey are considered accurate within ± 3.4%, 9 times out of 10. What is the confidence level:

• 90%

• 3.4%

• 64%

• 95%

A poll showed that 64% of grade 11 Math students reported better dental checkups after using Winterfresh Toothpaste. The results of the survey are considered accurate within ± 3.4%, 9 times out of 10. What is the confidence interval:

• 90% to 100%

• 3.4% to 64%

• 60.8% to 67.2%

• 90% to 95%

A poll showed that 64% of grade 11 Math students reported better dental checkups after using Winterfresh Toothpaste. The results of the survey are considered accurate within ± 3.4%, 9 times out of 10. If 54 students used this toothpaste, what is the range of the mean number of classmates who could expect better dental checkups?

• 33 to 36 people

• 32 to 37 people

• 35 people

• 2 to 4 people