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8 Cards in this Set
- Front
- Back
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Explain a left-skewed distribution
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Right has more data than on the left (Mean < median.)
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what is a statistical outlier?
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An observation that falls outside the overall pattern of the data set. Can be detected by checking:
observation < Q1 – 1.5 IQR or observation > Q3 + 1.5 IQR. |
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How do you interpret a box plot?
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based on the five number summary. A line is drawn from the minimum observation to Q1; a box is drawn from Q1 to Q3 with a vertical line at the median and a line is drawn from Q3 to the maximum
observation. Good for side |
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Which of the following graphical displays can be drawn using only the 5 number summary?
A. Scatterplot B. Bar graph C. Stemplot D. Histogram E. Boxplot |
E. Boxplot
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Which one of the following is a FALSE statement about statistical problem solving?
A. Each step in statistical problem solving can be manipulated either innocently or deliberately to influence people’s opinion. B. Determining what should be measured is an important part of question formulation. C. Subjects should always be chosen without human subjectivity or bias. D. Numbers should always be reported in context E. Giving measure of confidence is not necessary when reporting results of statistical inference. |
E. Giving measure of confidence is not necessary when reporting results of statistical inference.
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What does the standard deviation of a distribution measure?
A. Shape B. Spread C. Center D. Skewness |
B. Spread
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Coach Sloan is testing a new method of shooting free throws and plans to randomly assign 20 players to the new method 25 players to the traditional method. The mean percentage of free throws will then be compared between these two groups. What type of study is this?
A. An observational study B. A simple random sample C. A matched pairs experiment. D. A completely randomized experiment. E. A randomized block experiment. |
D. A completely randomized experiment
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A financial adviser told you that it is better to invest your money in the stock market than putting it in the bank. Assume that the distribution of stock returns is normal with mean µ=10.05% and standard deviation, σ=12.12% per year. Find the proportion of people who invested in the stock market that get less than 8% return on a typical year.
A. 0.0668 B. 0.3085 C. 0.4325 D. 0.6915 E. 0.4984 |
C. 0.4325
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