Question: Identify the Type I error corresponding to the hypothesis that the percentage of adults who have a job is less than 88%.
Answer Choices:
A. Fail to reject the null hypothesis that the percentage of adults who have a job is equal to 88% when that percentage is actually less than 88%.
B. Fail to reject the null hypothesis that the percentage of adults who have a job is less than 88% when the percentage is actually equal to 88%.
C. Reject the null hypothesis that the percentage of adults who have a job is less than 88% when that percentage is actually less than 88%.
D. Reject the null hypothesis that the percentage of adults who have a job is equal to 88% when that percentage is actually equal to 88%.
Answer: D. Reject the null hypothesis that the percentage of adults who have a job is equal to 88% when that percentage is actually equal to 88%.
Question: Express 0.4 < 𝑝 < 0.7 0.4<p<0.7 in interval notation.
Answer Choices:
A. (0.4, 0.7)
B. [0.4, 0.7]
Answer: A. (0.4, 0.7)
Question: Memory works like a recording and is exact.
Answer Choices:
True
False
Answer: False
Question: Express 0.675 < 𝑝 < 0.785 0.675<p<0.785 in interval notation.
Answer Choices:
A. [0.675, 0.785]
B. (0.675, 0.785)
Answer: B. (0.675, 0.785)
Question: Identify the Type II error corresponding to the hypothesis that the percentage of adults who have a job is less than 88%.
Answer Choices:
A. Reject the null hypothesis that the percentage of adults who have a job is equal to 88% when the percentage is actually equal to 88%.
B. Fail to reject the null hypothesis that the percentage of adults who have a job is less than 88% when the percentage is actually equal to 88%.
C. Reject the null hypothesis that the percentage of adults who have a job is less than 88% when that percentage is actually less than 88%.
D. Fail to reject the null hypothesis that the percentage of adults who have a job is equal to 88% when that percentage is actually less than 88%.
Answer: D. Fail to reject the null hypothesis that the percentage of adults who have a job is equal to 88% when that percentage is actually less than 88%.
Question: In the hypothesis test about replacing passwords with biometric security, identify the type of test.
Answer Choices:
Two-tailed
Left-tailed
Right-tailed
Answer: Two-tailed
Question: How do the requirements for constructing a confidence interval for σ or σ² differ from those for constructing a confidence interval for μ?
Answer Choices:
A. For confidence interval estimates of σ or σ², the requirement of a normal distribution is less strict, and the normality requirement cannot be waived for large samples.
B. For confidence interval estimates of σ or σ², the requirement of a normal distribution is stricter, and the normality requirement cannot be waived for large samples.
C. For confidence interval estimates of σ or σ², the requirement of a normal distribution is stricter.
D. For confidence interval estimates of σ or σ², the requirement of a normal distribution is less strict.
Answer: B. For confidence interval estimates of σ or σ², the requirement of a normal distribution is stricter, and the normality requirement cannot be waived for large samples.
Question: Choose the correct interpretation of the confidence interval for the population proportion.
Answer Choices:
A. One has 95% confidence that the sample proportion is equal to the population proportion.
B. One has 95% confidence that the interval from the lower bound to the upper bound actually does contain the true value of the population proportion.
C. 95% of sample proportions will fall between the lower bound and the upper bound.
D. There is a 95% chance that the true value of the population proportion will fall between the lower bound and the upper bound.
Answer: B. One has 95% confidence that the interval from the lower bound to the upper bound actually does contain the true value of the population proportion.
Question: State the conclusion about the null hypothesis when the P-value is 0.0257 and α = 0.05.
Answer Choices:
A. Fail to reject H₀ because the P-value is less than or equal to α.
B. Reject H₀ because the P-value is greater than α.
C. Reject H₀ because the P-value is less than or equal to α.
D. Fail to reject H₀ because the P-value is greater than α.
Answer: C. Reject H₀ because the P-value is less than or equal to α.
Question: Identify which of the following would be considered hypotheses and which would not. Remember that hypotheses must be “testable predictions.”
Answer Choices:
If high school students get 8 hours of sleep, then they will have improved reaction time.
AACC students who attend more class meetings have higher test scores.
Social media is bad for high school students.
Having a pet is good for college students.
Answer: Hypotheses:
If high school students get 8 hours of sleep, then they will have improved reaction time.
Not Hypotheses:
AACC students who attend more class meetings have higher test scores.
Social media is bad for high school students.
Having a pet is good for college students.
Question: What are the requirements for constructing a confidence interval estimate of σ or σ²?
Answer Choices:
A. The sample must be a simple random sample and the sample size must be greater than 30.
B. The sample must be a simple random sample.
C. The sample must be from a normally distributed population and the sample size must be greater than 30.
D. The sample must be a simple random sample and the sample must be from a normally distributed population.
Answer: D. The sample must be a simple random sample and the sample must be from a normally distributed population.
Question: Write a brief statement that interprets the confidence interval for the mean weight of Pepsi in a can.
Answer Choices:
A. One has 95% confidence that the sample mean weight of Pepsi in a can is equal to the population mean weight of Pepsi in a can.
B. There is a 95% chance that the true value of the population mean weight of Pepsi in a can will fall between the lower bound and the upper bound.
C. One has 95% confidence that the interval from the lower bound to the upper bound contains the true value of the population mean weight of Pepsi in a can.
D. Approximately 95% of sample mean weights of Pepsi in a can will fall between the lower bound and the upper bound.
Answer: C. One has 95% confidence that the interval from the lower bound to the upper bound contains the true value of the population mean weight of Pepsi in a can.
Question: In a t test with 38 video games observed, what does df denote?
Answer Choices:
A. The number of degrees of freedom
B. The sample standard deviation
C. The test statistic
D. The sample size
Answer: A. The number of degrees of freedom
Question: The original pulse rates are measured with units of “beats per minute”. What are the units of the corresponding z scores?
Answer Choices:
A. The z scores are measured with units of “beats.”
B. The z scores are measured with units of “minutes per beat.”
C. The z scores are measured with units of “beats per minute.”
D. The z scores are numbers without units of measurement.
Answer: D. The z scores are numbers without units of measurement.
Question: In the study by Loftus et al. (1978) the results showed the researchers’ hypothesis was
Answer Choices:
correct
incorrect
Answer: correct
Question: Which of the following does not show an operationalized definition for the given variable?
Answer Choices:
Researchers defined reaction time as the length of time in seconds that it takes a participant to hit a button from when a green light is flashed on a screen.
Researchers defined course success as a participant who obtained a final grade of A, B, or C.
Researchers defined depressed mood as when someone showed sadness.
A researcher defined adequate sleep as a minimum of 7.5 hours each night for a period of 7 straight days.
Answer: Researchers defined depressed mood as when someone showed sadness.
Question: Without using technical terms, state a final conclusion that addresses the original claim about adults erasing personal information online.
Answer Choices:
A. The percentage of adults that would erase all of their personal information online if they could is less than or equal to 46%.
B. There is sufficient evidence to support the claim that the percentage of adults that would erase all of their personal information online if they could is more than 46%.
C. The percentage of adults that would erase all of their personal information online if they could is more than 46%.
D. There is not sufficient evidence to support the claim that the percentage of adults that would erase all of their personal information online if they could is more than 46%.
Answer: B. There is sufficient evidence to support the claim that the percentage of adults that would erase all of their personal information online if they could is more than 46%.
Question: Loftus explains that her research has shown that when you give someone a false memory about something that happened when they were younger, the person
Answer Choices:
never really believes it and it has no effect on them later.
sometimes believes it really happened and it can have an impact on them later.
Answer: sometimes believes it really happened and it can have an impact on them later.
Question: In the Titus case, the victim:
Answer Choices:
Indicated that she was absolutely sure Titus was the one who raped her during the lineup, but later changed her mind.
Indicated that Titus was the closest to the person who raped her in a photo lineup and then later during the trial indicated that she was sure it had been Titus.
Indicated that Titus was not the person who raped her.
Answer: Indicated that Titus was the closest to the person who raped her in a photo lineup and then later during the trial indicated that she was sure it had been Titus.