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

In statistical terms, ______ the sample size ______ the width of the confidence interval about the mean at a given confidence level.

In statistical terms, ______ the sample size ______ the width of the confidence interval about the mean at a given confidence level.

a.increasing; decreases
b.increasing; increases
c.decreasing; decreases
d.none of these choices


Answer: A: increasing; decreases

Which of the following is a step in determining sample size?

Which of the following is a step in determining sample size?

a.estimate the standard deviation of the population
b.make a judgment about the allowable magnitude of error
c.determine a confidence level
d.all of these choices


Answer: D: All of these choices

The formula below is used to calculate the ______ .

The formula below is used to calculate the ______ .

(ZS/E)2

a.sample standard deviation
b.population standard deviation
c.sample size
d.sample variance


Answer: C: Sample Size

Which of the following represents the standard deviation of the sampling distribution?

Which of the following represents the standard deviation of the sampling distribution?

a.range
b.standard median
c.dispersion
d.standard error of the mean


Answer: D: Standard error of the mean

Which theory states that as sample size increases, the distribution of sample means of size n, randomly selected, approaches a normal distribution?

Which theory states that as sample size increases, the distribution of sample means of size n, randomly selected, approaches a normal distribution?

a.prospect theory
b.central-limit theorem
c.dispersion theory
d.entropy


Answer: B: Central-limit theorem

All of the following are characteristics of the standardized normal distribution EXCEPT _____.

All of the following are characteristics of the standardized normal distribution EXCEPT _____.

a.symmetrical about its mean
b.has an infinite number of cases
c.mean identifies the normal curve's highest point (the mode)
d.has a mean of 1 and a standard deviation of 0


Answer: D: Has a mean of 1 and a standard deviation of 0

If the population mean is assumed to be 20 and the sample standard deviation is 5, a score of 15 would have a Z-value of _____.

If the population mean is assumed to be 20 and the sample standard deviation is 5, a score of 15 would have a Z-value of _____.

a.+1.00
b.-7.00
c.-1.00
d.+5.00


Answer: C: -1.00

A frequency distribution of the population elements is called a _____.

A frequency distribution of the population elements is called a _____.

a.normal distribution
b.sample statistic
c.population distribution
d.standard error


Answer: C: Population distribution

A frequency distribution of a sample is called a(n) _____.

A frequency distribution of a sample is called a(n) _____.

a.sample distribution
b.inferred distribution
c.secondary distribution
d.standard distribution


Answer: A: Sample distribution

Which of the following is the symbol for the population standard deviation?

Which of the following is the symbol for the population standard deviation?

a.S
b.σ
c.μ
d.S2


Answer: B:σ

The _____ distribution is a symmetrical, bell-shaped distribution that describes the expected probability distribution of many chance occurrences.

The _____ distribution is a symmetrical, bell-shaped distribution that describes the expected probability distribution of many chance occurrences.

a.bell-weather
b.common
c.normal
d.unique


Answer: C: Normal

One of the most common probability distributions in statistics is the _____ distribution.

One of the most common probability distributions in statistics is the _____ distribution.

a.normal
b.bell
c.central
d.confidence interval


Answer: A: Normal

Which of the following is the symbol for the sample standard deviation?

Which of the following is the symbol for the sample standard deviation?

a.S
b.μ2
c.σ
d.σ2


Answer: a. S

Find the approximate standard deviation of the following set of scores: 3, 6, 2, 7, 8 .

Find the approximate standard deviation of the following set of scores: 3, 6, 2, 7, 8 .

a.2.24
b.2.59
c.3.32
d.6.70


Answer: B: 2.59

Which of the following eliminates the drawback of having the measure of dispersion in squared units rather than in the original measurement units?

Which of the following eliminates the drawback of having the measure of dispersion in squared units rather than in the original measurement units?

a.standard deviation
b.variance
c.deviation
d.mean


Answer: A: Standard deviation

If the average units produced in a month by a Ford Motor Co. plant for Ford Explorers is 22, but only 18 Explorers are produced on a given day in that same month, the deviation score for this one day is _____.

If the average units produced in a month by a Ford Motor Co. plant for Ford Explorers is 22, but only 18 Explorers are produced on a given day in that same month, the deviation score for this one day is _____.

a.+4
b.-4
c.40
d.2


Answer: B: -4