Measuring Data flashcards
38 practice cards drawn from the Measuring Data lessons. Tap a card to turn it over. Every answer is checked against the lesson it came from.
Read the Measuring Data lessons in full →
Median of 1, 2, 3, 7, 7, 9
5
from “Median and Mode”
Mode of 4, 4, 7, 8, 9
4
from “Median and Mode”
Which average is barely moved by one very small value?
the median
from “Measures of Central Tendency”
Which average is barely moved by one very large value?
the median
from “Measures of Central Tendency”
15 scores in the table. Which value holds the middle score, position 8?
3
from “Averages from a Frequency Table”
3 games with 1 goal each, and 3 games with 2. How many goals in all?
9
from “Averages from a Frequency Table”
8 values in 20-30 and 2 in 30-40. Estimate the mean.
27
from “Mean of Grouped Data”
4 values in 10-20 and 1 in 20-30. Estimate the mean.
17
from “Mean of Grouped Data”
Which interval is the modal class?
0–9
from “The Modal Class”
What is wrong with reading a single mode off this grouped table?
the individual values were not recorded
from “The Modal Class”
Lowest 4, highest 29. What is the range?
25
from “Range and IQR”
Readings 14, 18, 23 and one outlier at 48. What is the range?
34
from “Range and IQR”
Range of 2, 5, 8
6
from “Measures of Spread”
Range of 2, 6, 9
7
from “Measures of Spread”
Intervals hold 6, 3 and 3. What is the running total after the second?
9
from “Cumulative Frequency”
Intervals hold 6, 8 and 4. What is the running total after the second?
14
from “Cumulative Frequency”
200 people. How far up do you read for the median?
100
from “Quartiles from the Curve”
80 people. How far up do you read for the lower quartile?
20
from “Quartiles from the Curve”
300 people were surveyed. How far up the count is the 70th percentile read?
210
from “Percentiles”
400 people were surveyed. How far up the count is the 40th percentile read?
160
from “Percentiles”
Lower quartile 12, upper quartile 24. How wide is the box?
12
from “Box and Whisker”
100 values are drawn as a box plot. How many of them sit inside the box?
50
from “Box and Whisker”
A box plot comes out perfectly symmetric. What does that establish?
the data may be normal, but symmetry alone does not show it
from “Judging Normality from a Box Plot”
Minimum 0, quartiles 15 and 35, median 30, maximum 45. What shape is this?
skewed to the left, so it is not normal
from “Judging Normality from a Box Plot”
The mean of 8, 12, 16, 20 is 14. What is the mean absolute deviation?
4
from “Mean Absolute Deviation”
The mean of 4, 8, 12, 16 is 10. What is the mean absolute deviation?
4
from “Mean Absolute Deviation”
Same mean, which set has the smaller standard deviation: 9, 10, 11 or 2, 10, 18?
9, 10, 11
from “Standard Deviation”
Same mean, which set has the smaller standard deviation: 4, 5, 6 or 1, 5, 9?
4, 5, 6
from “Standard Deviation”
What is the standard deviation of 2, 2, 10, 10?
4
from “Standard Deviation: Ungrouped”
Mean is 6 and a value is 4. What is the squared distance?
4
from “Standard Deviation: Ungrouped”
Interval 0 to 10 holds 4 values. What total do they contribute?
20
from “Standard Deviation: Grouped”
Interval 20 to 30 holds 6 values. What total do they contribute?
150
from “Standard Deviation: Grouped”
Two sets both average 25. One has a much smaller spread. Which is more consistent?
the one with the smaller spread
from “Comparing Data Sets”
Two sets both average 30. One has a much smaller spread. Which is more consistent?
the one with the smaller spread
from “Comparing Data Sets”
In statistics, does a total always agree with every group?
no
from “Simpson’s Paradox”
In statistics, can a trend reverse when groups are combined?
yes
from “Simpson’s Paradox”
Scores 0, 1, 2 have counts 6, f, 4; the mean is 0.9. What is f?
10
from “Finding a Frequency from the Mean”
Scores 1, 2, 3 have counts 6, f, 2; the mean is 1.8. What is f?
12
from “Finding a Frequency from the Mean”