Question

Suppose a geographic researcher interested in the variable detailing average distance traveled to the nearest health center decides to carry out a one sample Z test. The researcher collects a SRS of 79 households sampled from a population with a known standard deviation of 32.8 miles.

A) If the researcher wants to be 95% confident about his estimate, calculate the margin of error base

d on the above information.

B) Carry out the same calculation above, but assuming the researcher wishes to be “virtually certain” about his estimate. (Use Z=3.0)

C) Compare the margin of errors calculated above.

match with the correct answer

		A) 8.71 B) 15.67 C) Margin of error decreases when you apply a larger confidence level.
		A) 10.26 B) 19.11 C) Margin of error doubles when you apply a larger confidence level.
		A) 7.23 B) 11.07 C) Margin of error increases when you apply a larger confidence level.

Answer 1