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Sagot :
The correct answer is: (the margin of error for 99% confidence is about 3.59 miles.
The delivery company's statistics on the average driving miles show that the true statements are:
- 95% confidence interval ... 82.87 to 88.33 miles.
- Margin of error 99% confidence ... 3.59 miles.
What is the 99% confidence interval?
Z score for 99% confidence interval is 2.576 so this can be found as:
= 85.6 ± (2.576 x 9.85) / √50
= (82.01 to 89.19)
What is the 95% confidence interval?
Z score for 95% confidence interval is 1.960 so this can be found as:
= 85.6 ± (1.96 x 9.85) / √50
= (82.87 to 88.33)
What is the 95% confidence margin of error?
With a Z score of 1.960:
= (1.96 x 9.85) / √50
= 2.70 miles
What is the 99% confidence margin of error?
= (2.576 x 9.85) / √50
= 3.59 miles
The correct options are therefore 2 and 5.
Find out more on the margin of error at https://brainly.com/question/10218601.
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