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 based 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.

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.