Question 1

Degrees of freedom are represented by the abbreviation.

Accepted Answer

A)  df
B)  fd
C)  def
D)  degfr

Question 2

Which of the following would be an appropriate alternative hypothesis for the one-sample t test of the hypothesis that the mean reaction time of a population of 45 year-old drivers is 0.653 seconds?

Accepted Answer

A)    H1:Xˉ=0.653H _ { 1 } : \bar { X } = 0.653H1​:Xˉ=0.653 
B)    H1:Xˉ≠0.653H _ { 1 } : \bar { X } 
eq 0.653H1​:Xˉ=0.653 
C)    H1:μ=0.653H _ { 1 } : \mu = 0.653H1​:μ=0.653 
D)    H1:μ≠0.653H _ { 1 } : \mu 
eq 0.653H1​:μ=0.653

Question 3

Statistical tests require both a(n)  and a(n)  hypothesis.

Accepted Answer

A)  null; alternative
B)  primary; secondary
C)  empirical; theoretical
D)  conceptual; testable

Question 4

In general, the t distribution is than the normal distribution.

Accepted Answer

A)  more symmetrical
B)  more peaked and less wide
C)  more negatively skewed
D)  flatter and wider

Question 5

The rejection region represents the values of a test statistic that have a probability alpha if is true.

Accepted Answer

A)  greater than; H0
B)  greater than; H1
C)  equal to or less than; H0
D)  equal to or less than; H1

Question 6

The statistical symbol α is known as.

Accepted Answer

A)  gamma
B)  delta
C)  beta
D)  alpha

Question 7

The degrees of freedom for the one-sample t test are found by.

Accepted Answer

A)  N
B)  N - 1
C)  N + 1
D)  N - 2

Question 8

The degrees of freedom determine the the sampling distribution of t.

Accepted Answer

A)  mean of
B)  range of values for
C)  variance of
D)  shape of

Question 9

Which of the following could be an appropriate null hypothesis for a statistical test concerning the mean income of 17-year old males?

Accepted Answer

A)    H0:Xˉ=$2617 H_{0}: \bar{X}=\$ 2617 H0​:Xˉ=$2617 
B)    H0:μ=$2617 H_{0}: \mu=\$ 2617 H0​:μ=$2617 
C)    H0:Xˉ≠$2617 H_{0}: \bar{X} 
eq \$ 2617 H0​:Xˉ=$2617 
D)    H0:μ≠$2617 H_{0}: \mu 
eq \$ 2617 H0​:μ=$2617

Question 10

A Type I error occurs if the null hypothesis is when it is.

Accepted Answer

A)  rejected; true
B)  not rejected; true
C)  rejected; false
D)  not rejected; false

Question 11

Which of the following would be an appropriate null hypothesis for the one-sample t test of the hypothesis that the mean reaction time of a population of 45 year-old drivers is 0.653 seconds?

Accepted Answer

A)    H0:Xˉ=0.653 H_{0}: \bar{X}=0.653 H0​:Xˉ=0.653 
B)    H0:Xˉ≠0.653 H_{0}: \bar{X} 
eq 0.653 H0​:Xˉ=0.653 
C)    H0:μ=0.653 H_{0}: \mu=0.653 H0​:μ=0.653 
D)    H0:μ≠0.653 H_{0}: \mu 
eq 0.653 H0​:μ=0.653

Question 12

Underlying the use of the one-sample t test is the assumption that the.

Accepted Answer

A)  distribution of scores in the sample is symmetrical
B)  population variance is equal to the sample variance
C)  degrees of freedom are greater than 30
D)  scores in the population are normally distributed

Question 13

Which of the following z values is least likely to occur by chance?

Accepted Answer

A)  z = +0.50
B)  z = -1.00
C)  z = -1.50
D)  z = +2.00

Question 14

If zobs does not fall into a rejection region, then the.

Accepted Answer

A)  alternative hypothesis is accepted
B)  alternative hypothesis is not rejected
C)  null hypothesis is rejected
D)  null hypothesis is not rejected

Question 15

If tobs does not fall into a rejection region, then the decision is to.

Accepted Answer

A)  reject the null hypothesis
B)  fail to reject the null hypothesis
C)  accept the alternative hypothesis
D)  decrease the value of alpha

Question 16

One characteristic of the two hypotheses formulated for a statistical test is that the hypotheses must.

Accepted Answer

A)  be statements about the same sample
B)  specify the sample value
C)  be written as a sentence
D)  include all possible values of the parameter in the population

Question 17

When H0 is true, expected values of t are distributed symmetrically around a value.

Accepted Answer

A)  of zero
B)  of 1.0
C)  of either +1.0 or -1.0
D)  that varies with degrees of freedom

Question 18

The probability of making a Type II error is given by.

Accepted Answer

A)    α\alphaα 
B)    1−α1-\alpha1−α 
C)    β\betaβ 
D)    1−β1 - \beta1−β

Question 19

A parametric statistical test involves hypotheses about.

Accepted Answer

A)  sample statistics such as the mean and standard deviation
B)  measures of central tendency such as the mode and median
C)  population values such as the mean and variance
D)  sample measures of central tendency and variability

Question 20

A Type I error.

Accepted Answer

A)  is more likely to occur with a smaller significance level
B)  is determined by the value of beta
C)  can occur only when the null hypothesis is true
D)  is more likely to occur than a Type II error

Exam 8: Is There Really a Difference Introduction to Statistical Hypothesis Testing

Statistical tests require both a(n) and a(n) hypothesis.

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A Type I error occurs if the null hypothesis is when it is.

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The degrees of freedom determine the the sampling distribution of t.

Correct AnswerverifiedShow Answer

Which of the following would be an appropriate null hypothesis for the one-sample t test of the hypothesis that the mean reaction time of a population of 45 year-old drivers is 0.653 seconds?

Correct AnswerverifiedShow Answer

Which of the following z values is least likely to occur by chance?

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Which of the following could be an appropriate null hypothesis for a statistical test concerning the mean income of 17-year old males?

Correct AnswerverifiedShow Answer

The degrees of freedom for the one-sample t test are found by.

Correct AnswerverifiedShow Answer

A parametric statistical test involves hypotheses about.

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If zobs does not fall into a rejection region, then the.

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When H0 is true, expected values of t are distributed symmetrically around a value.

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The probability of making a Type II error is given by.

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A Type I error.

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The statistical symbol α is known as.

Correct AnswerverifiedShow Answer

One characteristic of the two hypotheses formulated for a statistical test is that the hypotheses must.

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Underlying the use of the one-sample t test is the assumption that the.

Correct AnswerverifiedShow Answer

If tobs does not fall into a rejection region, then the decision is to.

Correct AnswerverifiedShow Answer

Which of the following would be an appropriate alternative hypothesis for the one-sample t test of the hypothesis that the mean reaction time of a population of 45 year-old drivers is 0.653 seconds?

Correct AnswerverifiedShow Answer

In general, the t distribution is than the normal distribution.

Correct AnswerverifiedShow Answer

The rejection region represents the values of a test statistic that have a probability alpha if is true.

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Degrees of freedom are represented by the abbreviation.

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