Question

1. Which of the following z-scores is located furthest AND below the mean of a distribution?

a.z = -3.0

b.z = -1.0

c.z = +1.0

d.z = +3.0

2. All of the following apply to the concept of variability EXCEPT:

a.it is a form of inferential statistics

b.it is a form of descriptive statistics

c.it measures the extent to which scores deviate from the mean

d.it measures distance/spread of scores in a distribution

3. Which statement best describes the concept of a z-score?

a.they standardize a distribution, but do not provide any information about location

b.they standardize a distribution and allow for comparisons between different distributions

c.they standardize a distribution and are always equal to raw scores

d.they do not standardize a distribution, but do provide information about location

4.What does the Unit Normal Table tell you about a distribution?

a.the standardized proportions of a normal distribution corresponding to raw scores

b.the standardized proportions of a skewed distribution corresponding to raw scores

c.the standardized proportions of a normal distribution corresponding to z-scores

d.the standardized proportions of a skewed distribution corresponding to z-scores

5.With respect to probability and sampling:

a.each individual in a population should have an equal chance of being selected for a sample

b.sampling should occur with replacement

c.both answers a and b

d.none of the above

27. Chapter 7: Question 27

Which statement best defines the concept of the distribution of sample means?

a.it is a distribution of all the possible means of a specified (n) taken from a population

b.it is a distribution of sample statistics (a sampling distribution)

c.it is a distribution of all the possible raw scores taken from a population

d.both answers a and b

29. Chapter 7: Question 29

All of the following are characteristics of a distribution of sample means EXCEPT:

a.sample means should occur mostly near this distribution's mean

b.with larger n's, this distribution becomes more variable

c.with smaller n's, this distribution becomes more variable

d.all of the above

31.) Hypothesis testing is a form of _________, which uses _________ data to evaluate a hypothesis about a _________.

            a. descriptive statistics; population; sample

            b. inferential statistics; population; sample

            c. inferential statistics; sample; population

            d. descriptive statistics; sample; population

33.Which of the following is true about the concept of statistical power?

a.it is a useless piece of information with respect to hypothesis testing

b.it is the probability that a hypothesis test will erroneously reject a true null hypothesis

c.it is the probability that a hypothesis test will correctly reject a false null hypothesis

d.it is also known as Type I Error (?)

35.) Which of the following does NOT apply to Type II Errors?

            a. Type II Error influences the power of a hypothesis test

            b. they occur when a researcher fails to reject a false null hypothesis

            c. the probability of a Type II Error is known as beta (β)

            d. all of the above apply

36. Chapter 9: Question 36

Under which conditions will it be very difficult to detect a treatment effect using the t-statistic?

a.with a small sample size and low sample variance

b.with a small sample size and high sample variance

c.with a large sample size and high sample variance

d.with a large sample size and low sample variance

37. Chapter 9: Question 37

All of the following are assumptions of the one-sample t-test EXCEPT:

a.scores come from independent observations

b.the population that is sampled is skewed

c.the population that is sampled is normal

d.none of the above (all of the above are assumptions)

39. Chapter 9: Question 39

What is the term for the estimated standard distance between a sample mean (M) and the population mean (u)?

a.estimated standard variance

b.estimated standard deviation

c.estimated standard error

d.estimated standard treatment effect

Answer 1

1. Which of the following z-scores is located furthest AND below the mean of a distribution?

Answer: a. z = -3.0

2. All of the following apply to the concept of variability EXCEPT:

Answer: a. it is a form of inferential statistics

3. Which statement best describes the concept of a z-score?

Answer: b. they standardize a distribution and allow for comparisons between different distributions

4.What does the Unit Normal Table tell you about a distribution?

Answer: a. the standardized proportions of a normal distribution corresponding to raw scores

5.With respect to probability and sampling:

Answer: c. both answers a and b

27. Which statement best defines the concept of the distribution of sample means?

Answer: a. it is a distribution of all the possible means of a specified (n) taken from a population

29. All of the following are characteristics of a distribution of sample means EXCEPT:

Answer: b. with larger n's, this distribution becomes more variable

31.) Hypothesis testing is a form of _________, which uses _________ data to evaluate a hypothesis about a _________.

Answer: c. inferential statistics; sample; population

33.Which of the following is true about the concept of statistical power?

Answer: c. it is the probability that a hypothesis test will correctly reject a false null hypothesis

35.) Which of the following does NOT apply to Type II Errors?

Answer: c. the probability of a Type II Error is known as beta (β)

36. Under which conditions will it be very difficult to detect a treatment effect using the t-statistic?

Answer: b. with a small sample size and high sample variance

37. All of the following are assumptions of the one-sample t-test EXCEPT:

Answer: b. the population that is sampled is skewed

39. What is the term for the estimated standard distance between a sample mean (M) and the population mean (u)?

Answer: c. estimated standard error