Confidence Interval (Home Costs) Quiz
The question sheet
Reveal any answer as you study-
What confidence level is the student asked to calculate for the mean cost of a home?
- 95 percent
- 99 percent
- 80 percent
- 90 percent
Reveal answer
Answer: 90 percent
Source evidence
PDF page 457: • The student will calculate the 90 percent confidence interval for the mean cost of a home in the area in which this
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How many randomly selected homes' sale prices should be recorded?
- 30
- 35
- 25
- 40
Reveal answer
Answer: 35
Source evidence
PDF page 457: Collect the Data Check the Real Estate section in your local newspaper. Record the sale prices for 35 randomly selected homes recently listed in the county.
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According to the text, how often do many newspapers list home sale prices?
- Once per month
- Twice per week
- Only one day per week
- Every day
Reveal answer
Answer: Only one day per week
Source evidence
PDF page 458: Many newspapers list them only one day per week. Also, we will assume that homes come up for sale randomly.
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What assumption is made about how homes come up for sale?
- Seasonally
- Randomly
- Alphabetically
- By price order
Reveal answer
Answer: Randomly
Source evidence
PDF page 458: Many newspapers list them only one day per week. Also, we will assume that homes come up for sale randomly.
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Which is one of the student learning outcomes for this lab?
- Perform a chi-square test
- Interpret confidence intervals
- Calculate a regression line
- Build a histogram
Reveal answer
Answer: Interpret confidence intervals
Source evidence
PDF page 457: • The student will interpret confidence intervals.
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The student will determine the effects of changing conditions on the:
- Population mean
- Regression line
- Confidence interval
- Sample size
Reveal answer
Answer: Confidence interval
Source evidence
PDF page 457: • The student will determine the effects of changing conditions on the confidence interval.
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After finding the interval, the student counts how many data values lie within the:
- First quartile
- Confidence interval
- Error bound
- Sample mean
Reveal answer
Answer: Confidence interval
Source evidence
PDF page 458: the first page and count how many of the data values lie within the confidence interval. What percentage is this? Is
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The percentage of data within the interval is compared to about what value?
- 50 percent
- 75 percent
- 90 percent
- 100 percent
Reveal answer
Answer: 90 percent
Source evidence
PDF page 459: this percentage close to 90 percent? Explain why this percentage should or should not be close to 90 percent. Describe the Confidence Interval
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The confidence interval should be described for whom?
- Someone who has not taken statistics
- A math teacher
- A newspaper editor
- A professional statistician
Reveal answer
Answer: Someone who has not taken statistics
Source evidence
PDF page 459: someone who has not taken statistics.
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The table used to construct intervals lists confidence level, confidence interval, and:
- Sample size
- Slope
- Population mean
- EBM/error bound
Reveal answer
Answer: EBM/error bound
Source evidence
PDF page 459: Confidence Level EBM/Error Bound Confidence Interval
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What is recorded for each of the 35 selected homes?
- Sale prices
- Year built
- Square footage
- Number of rooms
Reveal answer
Answer: Sale prices
Source evidence
PDF page 457: Collect the Data Check the Real Estate section in your local newspaper. Record the sale prices for 35 randomly selected homes recently listed in the county.
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The limits of the confidence interval are compared with the:
- Median
- Mode
- Population mean
- Sample mean
Reveal answer
Answer: Sample mean
Source evidence
PDF page 458: limits of the confidence interval and the sample mean.
Statistics
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