The confidence interval for a proportion uses which of the following formulas?

The confidence interval for a proportion uses which of the following formulas?

a.p ±ZSp
b.Sp ±ZP
c. ±ZSs
d.none of these choices


Answer: A: p ±ZSp

If 35 percent of TV viewers recalled seeing an ad for a Toyota Prius on a particular television program based on a sample of 800 viewers, the 95 percent confidence interval for this study would be between approximately _____.

If 35 percent of TV viewers recalled seeing an ad for a Toyota Prius on a particular television program based on a sample of 800 viewers, the 95 percent confidence interval for this study would be between approximately _____.

a.
30 percent and 40 percent
b.
32 percent and 38 percent
c.
28 percent and 42 percent
d.
20 percent and 30 percent


Answer: B: 32 percent and 38 percent

An estimate of the population mean in the form of a single value, usually the sample mean, is called a _____.

An estimate of the population mean in the form of a single value, usually the sample mean, is called a _____.

a.confidence interval estimate
b.standard deviation
c.point estimate
d.variant


Answer: C: Point estimate

If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120, the 95 percent confidence interval about the mean is between approximately _____.

If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120, the 95 percent confidence interval about the mean is between approximately _____.

a.44.37 and 51.63
b.46.12 and 49.88
c.47.88 and 48.12
d.40.0 and 50.0


Answer: B: 46.12-49.88