Back to the on-screen lesson ·
Apply data across unfamiliar problems: original cases with explanations after your first response.
Paper packet. Every task here also exists on screen, where it is checked automatically; answers written on paper are not assessed by Nydus. When you are back at a device, enter your answers there.
Identify totals, denominators, units and interval boundaries in each display description. Compute the requested derived quantity before comparing categories or years.
A frequency table gives values 1,2,3 with frequencies 4,6,10. What is the mean?
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A histogram has counts 5,12,8,5 in intervals [0,10),[10,20),[20,30),[30,40). What percent of observations are at least 20? Enter a fraction or decimal.
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A line chart reports sales 80,100,90,135 in successive quarters. What is the percentage increase from the third to the fourth quarter?
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A circle chart assigns 72 degrees to travel expenses. Total expenses are 3500. How much is travel?
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A boxplot has minimum 2, Q1=5, median=9, Q3=14 and maximum 30. What is its interquartile range?
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Two bars show 45 and 75 employees in two offices. What fraction of all employees are in the larger office?
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A scatterplot's fitted line is y=2x+5. At x=7, the observed value is y=16. What is observed minus predicted?
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A cumulative table reports 8 observations below 10, 23 below 20, and 40 below 30. How many observations are in [10,20)?
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A table shows revenue 250 and cost 200 in year A, then revenue 300 and cost 225 in B. By what percent did profit increase?
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A survey chart reports 35 percent choosing X, 25 percent choosing Y and 40 percent choosing Z. There are 240 responses, each choosing exactly one. How many more chose Z than Y?
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A table gives distances 24,36 and 60 km and times 2,3 and 4 hours for three trips. What is the overall average speed in km/h? Enter a fraction.
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Two programs report success counts: A has 18 of 20 in an easy group and 8 of 20 in a hard group; B has 80 of 100 in the easy group and 3 of 10 in the hard group. Although A has a higher rate within each group, by how many percentage points does B's overall rate exceed A's? Enter an exact fraction.
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Check whether the question asks about counts, rates, profit or percent change; similar-looking columns can require different denominators.