Suppose a Gallup Poll using a sample of 400 individuals found that 25 of them supported a particular opinion. An interval that is 95 certain to contain the truth about the population percent who support that opinion is
a. 25 0.05 or 24.95 to 25.05.
b. 25 0.25 or 24.75 to 25.25.
c. 25 5 or 20 to 30.
d. 25 20 or 5 to 45.
Question 2
Which of the following is true about the margin of error for the most common types of surveys?
a. If the number of individuals in the sample were to be substantially increased, the margin of error would decrease.
b. If the number of individuals in the sample were to be substantially decreased, the margin of error would also decrease.
c. If the number of individuals in the sample were to be substantially increased, the margin of error would not change.
d. If the number of individuals in the sample were to be substantially decreased, the margin of error would not change.
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