Unit Test Unit Test Review – Flashcards
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Which set of population data is the least dispersed from its mean?
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6, 2, 2, 2
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Voluntary sampling is one type of sampling method that is not probability based. This means that
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the results of the survey cannot reliably be extended and generalized.
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The graph below shows the amount of time Misha spent outside over a 30-day period. How might the graph be considered misleading?
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The y-interval shows exponential increase rather than linear increase.
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The histogram below shows the estimated monthly salaries of company How might the graph be misleading?employees with different years of experience.
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The scale on the y-axis overemphasizes the difference in salaries between different experience levels
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If the graph is redrawn so that the scale on the y-axis begins with zero, which aspect of the graph will change the most?
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The difference in the heights of the bars will not appear as great.
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The histogram below shows the average number of days per year in 117 Oklahoma cities where the high temperature was greater than 90 degrees Fahrenheit.Which is an accurate comparison?
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The mean is likely greater than the median because the data is skewed to the right.
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A utility company hires pollsters to knock on random doors in different parts of town to survey residents about the cost of their electric bill. Which type of bias could affect this study?
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nonresponse
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A scientist calculated the mean and standard deviation of a data set to be mc026-1.jpg and mc026-2.jpg. She then found that she was missing one data value from the set. She knows that the missing data value was exactly 3 standard deviations away from the mean. What was the missing data value?
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147
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The president of the math club is conducting a survey to see where the twelfth-grade class wants to go on their field trip. Instead of asking the whole class, she surveys only the twelfth-grade members of the math club. She records their choices and plans to present the results to the school principal. What type of sampling did she use?
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convenience sampling
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A supervisor finds the mean number of miles that the employees in a department live from work. He finds mc022-1.jpg and mc022-2.jpg. Which statement must be true?
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z37 is between 2 and 3 standard deviations of the mean
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Opal is collecting data on water levels in different parts of town. She notices that her sample data has a low-value outlier. Which statement must be true?
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Removing the outlier will decrease the spread of the graph of the data set.
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A researcher wants to survey people from different age groups to analyze voting patterns. Which type of survey will best accomplish this goal?
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stratified sampling
