Stats Final- Unit 1 – Flashcards
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School administrators collect data on students attending the school. Which of the following variables is quantitative?
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Grade point average
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Which is true of the data shown in the histogram? (Normal model histogram)
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I. The distribution is approximately symmetrical and II. The mean and median are approximately equal
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A professor has kept records on grades that students have earned in his class. If he wants to examine the percentage of students earning the grades A, B, C, D, and F during the most recent term, which kind of plot could he make?
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Pie chart
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Your stats teacher tells you your test score was in the 3rd quartile for the class. Which is true?
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none of the choices
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The five-number summary of credit hour for 24 students in a statistics class is: (Min=13, QI=15, Median=16.5, Q3=18, Max=22) From this information we know that...
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There are no outliers in this data
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Which is true of the data shown in the histogram? (histogram in slanted upwards toward the right)
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II. The mean is probably smaller than the median and III. We should use the median and IQR to summarize these data
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Suppose that a normal model describes fuel economy (miles per gallon) for automobiles and that a Saturn has a standardized score (z-score) of +2.2. This means that Saturns...
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Achieve fuel economy that is 2.2 standard deviations better than the average car.
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The SPCA collects data about the dogs they house. Which data is categorical?
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Breed
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Which variable about German Shepherds is most likely to be described by a normal model?
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Weight
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The SPCA has kept these data records for the past 20 years. If they want to show the trend in the number of dogs they have housed, what kind of plot should they make?
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Timeplot
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The veterinary bill for the dogs are summarized in the ogive below. Estimate the IQR of these expenses. (Look at chart #4 on Unit 1 Test)
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$100
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Which is true of the data whose distribution is shown? (histogram #5 on Unit 1 Test)
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I only. The distribution is skewed to the right
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Last weekend police ticketed 18 men whose mean speed was 72 miles per hour, and 30 women going an average of 64 mph. Overall, what was the mean speed of all ticketed people?
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67 mph
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If we want to discuss any gaps and clusters in a data set, which of the following should not be chosen to display the data set?
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Box plot
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The standard deviation of the data displayed in this dot plot is most likely to be... (dot plot #9 on Unit 1 Test)
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12
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The advantage of making a stem-and-leaf display instead of a dot plot is that a stem-and-leaf display...
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preserves the individual data values
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Which of the following data summaries are changed by adding a constant to each data value?
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I. the mean and II. the median
