Question 1

Given zcrit = -2.33, which of the following obtained z-values will result in rejecting the null hypothesis?

Accepted Answer

A)   zobt = +2.40
B)   zobt = -2.40
C)   zobt = +2.09
D)   zobt = -2.09E) None of the above
F) All of the above

Question 2

In conducting a z-test with a nondirectional alternative hypothesis, we would

Accepted Answer

A)   use a two-tailed test.
B)   use a one-tailed test.
C)   not divide the alpha level in two.
D)   both "b" and "c" are correct.E) B) and C)
F) None of the above

Question 3

Step four of the hypothesis testing procedure involves

Accepted Answer

A)   stating the hypothesis.
B)   determining critical values.
C)   calculating the statistics.
D)   making a decision and reporting the results.E) None of the above
F) B) and C)

Question 4

In hypothesis testing, if we obtain a sample mean that is larger than the population mean,

Accepted Answer

A)   we can reject the null hypothesis.
B)   we can reject the alternative hypothesis.
C)   the difference could be due to random sampling error.
D)   we can conclude that our treatment was effective.E) None of the above
F) A) and C)

Question 5

Assume a study is being conducted to determine if a sample mean would be significantly different from the population mean of 35. Write the symbolic notation for both the null and alternative hypotheses for 
a. a nondirectional test, and
b. a directional test that specifies that the treatment will improve scores.

Accepted Answer

a. H₀: μ = 35, H₁: μ...

Question 6

Obtained sample values that fall in the rejection region of a sampling distribution

Accepted Answer

A)   have a high probability of occurrence if H₀ is true.
B)   have a low probability of occurrence if H₀ is true.
C)   suggest that the independent variable was effective.
D)   both "b" and "c" are true.E) A) and D)
F) A) and C) D

Question 7

It is more difficult to reject H₀

Accepted Answer

A)   with a one-tailed test.
B)   with a two-tailed test.
C)   with α = .05 rather than .01.
D)   with α = .01 rather than .001.E) A) and B)
F) A) and C)

Question 8

A researcher is on the verge of a breakthrough for a medical procedure that has little risk but that could be of great benefit to patients. What alpha level should she choose?

Accepted Answer

A)   .05
B)   .02
C)   .01
D)   .001E) A) and C)
F) A) and B)

Question 9

Procedures that test hypotheses about populations are called

Accepted Answer

A)   parametric tests.
B)   statistical tests.
C)   empirical tests.
D)   descriptive statistics.E) A) and B)
F) None of the above

Question 10

Hypothesis testing is based on the assumption that

Accepted Answer

A)   the null hypothesis is true.
B)   the null hypothesis is false.
C)   the independent variable will be effective.
D)   differences between μ and M are true differences, rather than chance differences.E) All of the above
F) B) and C)

Question 11

In hypothesis testing if a significant effect is found, you should

Accepted Answer

A)   do nothing.
B)   reject the alternative hypothesis.
C)   fail to reject the null hypothesis.
D)   reject the null hypothesis.E) B) and C)
F) A) and D)

Question 12

The score that marks the beginning of the rejection area in a sampling distribution is the

Accepted Answer

A)   obtained z-score.
B)   obtained sample mean.
C)   population mean.
D)   critical value.E) A) and B)
F) B) and D)

Question 13

Which of the following statements about the alpha level is NOT true?

Accepted Answer

A)   It is a probability level.
B)   It is a population parameter.
C)   It defines the point at which H₀ should be rejected.
D)   It defines the point at which the critical region begins.E) All of the above
F) None of the above

Question 14

If zcrit = ±2.33 and zobt = +2.12, the correct statistical decision would be to ______________.

Accepted Answer

A)   retain H₁
B)   fail to reject H₁
C)   reject H₀
D)   fail to reject H₀E) All of the above
F) A) and B)

Question 15

A study resulted with a zobt = +2.34. zcrit was ±2.03 with α = .05. Based on these results,

Accepted Answer

A)   we should fail to reject H₀.
B)   we should reject H₁.
C)   p > .05
D)   p < .05E) A) and B)
F) A) and C)

Question 16

If we have committed a Type II error, we have

Accepted Answer

A)   used the wrong alpha level.
B)   claimed a treatment to be effective when it wasn't.
C)   failed to recognize a treatment that was effective.
D)   rejected a null hypothesis that was actually true.E) B) and C)
F) All of the above C

Question 17

If our obtained sample mean falls in the critical region of a sampling distribution, have we gained support for H₀ or H₁? Explain.

Accepted Answer

H₁ is supported if our obtained sample m...

Question 18

Step 2 of the hypothesis testing procedure instructs us to

Accepted Answer

A)   calculate the relevant statistics.
B)   indicate the alpha level and determine critical values.
C)   formulate our hypotheses.
D)   make a decision and report the results.E) A) and C)
F) B) and C) B

Question 19

If we are using a directional alternative hypothesis for a z-test with α = .01, what critical value(s)  should be used for rejecting the null hypothesis?

Accepted Answer

A)   -2.33 only or +2.33 only.
B)   either ±2.33
C)   -2.58 only or +2.58 only.
D)   either ±2.58.E) A) and B)
F) B) and D)

Question 20

A non-directional alternative hypotheses for a z-test can be represented as

Accepted Answer

A)   H₁: μ ≤ 60.
B)   H₁: μ ≠ 60.
C)   H₁: μ ≥ 60.
D)   either "a" or "c" above.E) A) and B)
F) None of the above

Exam 8: Hypothesis Testing

Given z_crit = -2.33, which of the following obtained z-values will result in rejecting the null hypothesis?

Correct Answer
verified

In conducting a z-test with a nondirectional alternative hypothesis, we would

Correct Answer
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Step four of the hypothesis testing procedure involves

Correct Answer
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In hypothesis testing, if we obtain a sample mean that is larger than the population mean,

Correct Answer
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Correct Answer
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a. H₀: μ = 35, H₁: μ...
View Answer

Obtained sample values that fall in the rejection region of a sampling distribution

Correct Answer
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D

It is more difficult to reject H₀

Correct Answer
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A researcher is on the verge of a breakthrough for a medical procedure that has little risk but that could be of great benefit to patients. What alpha level should she choose?

Correct Answer
verified

Procedures that test hypotheses about populations are called

Correct Answer
verified

Hypothesis testing is based on the assumption that

Correct Answer
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In hypothesis testing if a significant effect is found, you should

Correct Answer
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The score that marks the beginning of the rejection area in a sampling distribution is the

Correct Answer
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Which of the following statements about the alpha level is NOT true?

Correct Answer
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If z_crit = ±2.33 and z_obt = +2.12, the correct statistical decision would be to ______________.

Correct Answer
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A study resulted with a z_obt = +2.34. z_crit was ±2.03 with α = .05. Based on these results,

Correct Answer
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If we have committed a Type II error, we have

Correct Answer
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C

If our obtained sample mean falls in the critical region of a sampling distribution, have we gained support for H₀ or H₁? Explain.

Correct Answer
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H₁ is supported if our obtained sample m...
View Answer

Step 2 of the hypothesis testing procedure instructs us to

Correct Answer
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B

If we are using a directional alternative hypothesis for a z-test with α = .01, what critical value(s) should be used for rejecting the null hypothesis?

Correct Answer
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A non-directional alternative hypotheses for a z-test can be represented as

Correct Answer
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Exam 8: Hypothesis Testing

Given zcrit = -2.33, which of the following obtained z-values will result in rejecting the null hypothesis?

Correct AnswerverifiedShow Answer

In conducting a z-test with a nondirectional alternative hypothesis, we would

Correct AnswerverifiedShow Answer

Step four of the hypothesis testing procedure involves

Correct AnswerverifiedShow Answer

In hypothesis testing, if we obtain a sample mean that is larger than the population mean,

Correct AnswerverifiedShow Answer

Correct Answerverifieda. H₀: μ = 35, H₁: μ...View AnswerShow Answer

Obtained sample values that fall in the rejection region of a sampling distribution

Correct AnswerverifiedD

It is more difficult to reject H₀

Correct AnswerverifiedShow Answer

A researcher is on the verge of a breakthrough for a medical procedure that has little risk but that could be of great benefit to patients. What alpha level should she choose?

Correct AnswerverifiedShow Answer

Procedures that test hypotheses about populations are called

Correct AnswerverifiedShow Answer

Hypothesis testing is based on the assumption that

Correct AnswerverifiedShow Answer

In hypothesis testing if a significant effect is found, you should

Correct AnswerverifiedShow Answer

The score that marks the beginning of the rejection area in a sampling distribution is the

Correct AnswerverifiedShow Answer

Which of the following statements about the alpha level is NOT true?

Correct AnswerverifiedShow Answer

If zcrit = ±2.33 and zobt = +2.12, the correct statistical decision would be to ______________.

Correct AnswerverifiedShow Answer

A study resulted with a zobt = +2.34. zcrit was ±2.03 with α = .05. Based on these results,

Correct AnswerverifiedShow Answer

If we have committed a Type II error, we have

Correct AnswerverifiedC

If our obtained sample mean falls in the critical region of a sampling distribution, have we gained support for H₀ or H₁? Explain.

Correct AnswerverifiedH₁ is supported if our obtained sample m...View AnswerShow Answer

Step 2 of the hypothesis testing procedure instructs us to

Correct AnswerverifiedB

If we are using a directional alternative hypothesis for a z-test with α = .01, what critical value(s) should be used for rejecting the null hypothesis?

Correct AnswerverifiedShow Answer

A non-directional alternative hypotheses for a z-test can be represented as

Correct AnswerverifiedShow Answer

Given z_crit = -2.33, which of the following obtained z-values will result in rejecting the null hypothesis?

Correct Answer
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Correct Answer
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a. H₀: μ = 35, H₁: μ...
View Answer

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D

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If z_crit = ±2.33 and z_obt = +2.12, the correct statistical decision would be to ______________.

Correct Answer
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A study resulted with a z_obt = +2.34. z_crit was ±2.03 with α = .05. Based on these results,

Correct Answer
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Correct Answer
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C

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H₁ is supported if our obtained sample m...
View Answer

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B

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