Test of Two Variances Quiz
The question sheet
Reveal any answer as you study-
In Manuel's coinage study, which coinage had the highest mean silver content?
- First Coinage
- Third Coinage
- Fourth Coinage
- Second Coinage
Reveal answer
Answer: Second Coinage
Source evidence
PDF page 544: First Second Third Fourth
PDF page 544: Mean 6.7444 8.2429 4.875 5.6143 Variance 0.2953 1.2095 0.2025 0.1314
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According to the coin data, which coinage had the smallest variance?
- Fourth Coinage
- First Coinage
- Third Coinage
- Second Coinage
Reveal answer
Answer: Fourth Coinage
Source evidence
PDF page 544: First Second Third Fourth
PDF page 544: Mean 6.7444 8.2429 4.875 5.6143 Variance 0.2953 1.2095 0.2025 0.1314
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What significance level is used for the rat weight-gain variance test?
- 5%
- 0.5%
- 10%
- 1%
Reveal answer
Answer: 10%
Source evidence
PDF page 541: Determine whether or not the variance in weight gain is statistically the same among Javier’s and Linda’s rats. Test at a significance level of 10%.
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In the commuting mileage study, how many individuals were randomly surveyed?
- 20
- 30
- 12
- 24
Reveal answer
Answer: 24
Source evidence
PDF page 542: people the most, since they commute the farthest to work. Suppose that the group randomly surveyed 24 individuals and asked them their daily one-way commuting mileage. The results are as follows.
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What significance level is specified for the commuting mileage variance test?
- 10%
- 5%
- 1%
- 2%
Reveal answer
Answer: 5%
Source evidence
PDF page 542: Determine whether or not the variance in mileage driven is statistically the same among the working class and professional (middle income) groups. Use a 5% significance level. Use the following information to answer the next two exercises. The following table lists the number of pages in four different types of magazines.
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In the mall spending study, results were compared between which two days?
- Weekday and weekend
- Saturday and Sunday
- Sunday and Monday
- Friday and Saturday
Reveal answer
Answer: Saturday and Sunday
Source evidence
PDF page 543: for the amount of money that shoppers spend on Sundays at the mall? Suppose that the Table 12.21 shows the results of a study.
PDF page 543: Saturday Sunday Saturday Sunday
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In the income study comparing East and West, what level of significance is used?
- 0.02
- 0.05
- 0.10
- 0.01
Reveal answer
Answer: 0.05
Source evidence
PDF page 543: the results of a study. Income is shown in thousands of dollars. Assume that both distributions are normal. Use a level of significance of 0.05.
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In the income study, income is shown in what units?
- Thousands of dollars
- Millions of dollars
- Dollars
- Hundreds of dollars
Reveal answer
Answer: Thousands of dollars
Source evidence
PDF page 543: the results of a study. Income is shown in thousands of dollars. Assume that both distributions are normal. Use a level of significance of 0.05.
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What did the grassroots group claim about the proposed gas tax increase?
- It would help commuters
- It would lower incomes
- It would hurt working-class most
- It would raise mileage
Reveal answer
Answer: It would hurt working-class most
Source evidence
PDF page 542: 56. A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt working-class
PDF page 542: people the most, since they commute the farthest to work. Suppose that the group randomly surveyed 24 individuals and asked them their daily one-way commuting mileage. The results are as follows.
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In the caffeine experiment, which doses were given to the men?
- 0, 50, 100 mg
- 0, 100, 200 mg
- 0, 200, 400 mg
- 100, 200, 300 mg
Reveal answer
Answer: 0, 100, 200 mg
Source evidence
PDF page 544: with each receiving one of three doses of caffeine: 0 mg, 100 mg, 200 mg. This is approximately the amount in no, one, or two cups of coffee. Two hours after ingesting the caffeine, the men had the rate of finger tapping per minute recorded. The experiment was double blind, so neither the recorders nor the students knew which group they were in. Does caffeine affect the rate of tapping, and if so how? Here are the data:
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In the caffeine study, what was recorded two hours after ingestion?
- Heart rate
- Sleep duration
- Rate of finger tapping
- Blood pressure
Reveal answer
Answer: Rate of finger tapping
Source evidence
PDF page 544: with each receiving one of three doses of caffeine: 0 mg, 100 mg, 200 mg. This is approximately the amount in no, one, or two cups of coffee. Two hours after ingesting the caffeine, the men had the rate of finger tapping per minute recorded. The experiment was double blind, so neither the recorders nor the students knew which group they were in. Does caffeine affect the rate of tapping, and if so how? Here are the data:
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The caffeine experiment was described as which type of study?
- Double blind
- Observational
- Open label
- Single blind
Reveal answer
Answer: Double blind
Source evidence
PDF page 544: with each receiving one of three doses of caffeine: 0 mg, 100 mg, 200 mg. This is approximately the amount in no, one, or two cups of coffee. Two hours after ingesting the caffeine, the men had the rate of finger tapping per minute recorded. The experiment was double blind, so neither the recorders nor the students knew which group they were in. Does caffeine affect the rate of tapping, and if so how? Here are the data:
Introductory Business Statistics
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