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8.In order to use a normal distribution to compute confidence intervals for p, what conditions on n·p and n·q
need to be satisfied?
n·p < 5; n·q < 5
n·p 5
n·p > 5; n·q > 5
n·p > 5; n·q < 5
9.
You want to conduct a survey to determine the proportion of people who favor a proposed tax policy. How does increasing the sample size affect the size of the margin of error?
As the sample size increases, the margin of error increases.
As the sample size increases, the margin of error decreases.
As the sample size increases, the margin of error remains the same.
10.
What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of error of 0.1 in the following scenarios? (For each answer, enter a number. Round your answers up the nearest whole number.)
(a) a preliminary estimate for p is 0.36
(b) there is no preliminary estimate for p
 
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