Question

Question 12 pts

Which of the following statements is true regarding the normal distribution?

The mean and the median are roughtly equal to one another

The mean is always greater than the median

The mean is always less than the median

The mean is always 1

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Question 22 pts

A smaller standard deviation for the normal probability distribution results in

flatter curve that is more spread out around the mean

skinnnier, taller curve that is more tightly grouped around the mean

a distribution that looks identical to one with a larger standard deviation

a curve that is uniformly distributed

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Question 32 pts

Which is true regarding the z-score for a value that falls below the mean?

It will have a positive z-score

It will have a negative z-score

It will have a z-score of exactly 0

We do not know anything about that z-score until we calculate it

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Question 42 pts

In _____________ sampling, the kth member of the population is chosen for the sample.

systematic

simple random

non probability

cluster

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Question 52 pts

Deanna has been hired to visit the local shopping mall to conduct a survey about the upcoming political election. She needs to select respondents at the mall and ask them questions about their voting tendencies. Voting records show that 50% of the population are registered as republicans, 35% as Democrats, and the remaining as Independents. Deanna wants to be sure that her final sample has a similar proportion of voters. Which of the following sampling techniques best describes Deanna's methods?

cluster

convenience

simple random

stratified

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Question 62 pts

The Central Limit Theorem requires _______________________________

the population be normally distributed to ensure that the sample means are normally distributed

the bootstrap method be used to select the sample

a sample size of at least 30 be used to ensure that the samples means are normally distributed

the sample size to be less than 5% of the size of the population

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Question 72 pts

As the sample size increases

the standard error becomes smalller

the sampling error increases

the population standard deviation increases

the standard error becomes larger

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Question 82 pts

The purpose of the finite corretion factor for the standard error of the mean is to reflect the fact that the

sampling error is higher for a finite population when compared to an infinite population

sampling error is lower for a finite population when compared to an infinite population

sample size is not at least 30

the population standard deviation is higher

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Question 92 pts

The sampling distribution of the proportion follows the normal distribution when

n is at least 30

n/N is at least 5%

np >= 5 and n(1-p) >=5

N is infinite

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Question 102 pts

Increasing the sample size when calculating a confidence interval while keeping the confidence level constant will

reduce the margin of error, resulting in a more narrow confidence interval

increase the margin of error

result in no change to the margin of error

reduce the margin of error, resulting in a wider confidence interval

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Question 112 pts

A ________________ is defined as the probability that the interval will include the population parameter of interest.

margin of error

confidence level

level of significance

standard error

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Question 122 pts

As the confidence level increases the width of the confidence interval ______________.

increases

decreases

stays the same

doubles

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Question 132 pts

The pvalue for a hypothesis test is defined as the probability of observing a ____________________________________.

critcal value at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is true

critcal value at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is false

sample mean at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is true

sample mean at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is false

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Question 142 pts

The probability of a Type I Error is denoted by ____________.

Alpha

Beta

Sigma

Mu

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Question 152 pts

We start out with the assumption that the __________ hypothesis is correct and see if we have proof to the contrary.

Alternate

Null

Upper Tailed

Significant

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Question 162 pts

Which of the following could NOT be a an example of an Alternative Hypothesis?

H1: u < 25

H1: u > 25

H1: u = 25

H1: u /= 25

Answer 1

Q)Which of the following statements is true regarding the normal distribution?

ANS: The mean and the median are roughly equal to one another.

Q)A smaller standard deviation for the normal probability distribution results in

ANS: skinnier, taller curve that is more tightly grouped around the mean

Q)Which is true regarding the z-score for a value that falls below the mean?

ANS: It will have a negative z-score

Q)In _____________ sampling, the kth member of the population is chosen for the sample.

ANS:  systematic

Q).Which of the following sampling techniques best describes Deanna's methods?

ANS: stratified

Q).The Central Limit Theorem requires

ANS: a sample size of at least 30 be used to ensure that the samples means are normally distributed

Q).As the sample size increases

ANS:the population standard deviation increases

Q).The purpose of the finite correction factor for the standard error of the mean is to reflect the fact that the

ANS: sampling error is lower for a finite population when compared to an infinite population.

Q).The sampling distribution of the proportion follows the normal distribution when

ANS: np >= 5 and n(1-p) >=5

Q) Increasing the sample size when calculating a confidence interval while keeping the confidence level constant will

ANS:reduce the margin of error, resulting in a more narrow confidence interval

Q) The probability of a Type I Error is denoted by ____________.

ANS: Alpha (α )