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 →
What is the median of 1, 2, 3, 7, 7, 9?
5
from “Median and Mode”
What is the mode of 1, 2, 3, 4, 4, 8?
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”
The table holds 15 scores. Which value is the middle score, in 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”
What is the midpoint of the interval 10 to 30?
20
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”
The lowest value is 4 and the highest is 29. What is the range?
25
from “Range and IQR”
The readings are 14, 18 and 23, with one outlier at 48. What is the range?
34
from “Range and IQR”
What is the range of 2, 5, 8?
6
from “Measures of Spread”
What is the range of 2, 6, 9?
7
from “Measures of Spread”
Three intervals hold 6, 3 and 3. What is the running total after the second interval?
9
from “Cumulative Frequency”
Three intervals hold 6, 8 and 4. What is the running total after the second interval?
14
from “Cumulative Frequency”
There are 200 people. At what cumulative frequency do you read across for the median?
100
from “Quartiles from the Curve”
There are 80 people. At what cumulative frequency do you read across for the lower quartile?
20
from “Quartiles from the Curve”
300 people were surveyed. At what cumulative frequency is the 70th percentile read?
210
from “Percentiles”
400 people were surveyed. At what cumulative frequency is the 40th percentile read?
160
from “Percentiles”
The lower quartile is 12 and the upper quartile is 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”
The minimum is 0, the quartiles are 15 and 35, the median is 30 and the maximum is 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”
Both sets have the same mean. Which has the smaller standard deviation: 9, 10, 11 or 2, 10, 18?
9, 10, 11
from “Standard Deviation”
Both sets have the same mean. Which 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”
The mean is 6 and a value is 4. What is the squared distance from the mean?
4
from “Standard Deviation: Ungrouped”
The interval 0 to 10 holds 4 values. What do they contribute to the total?
20
from “Standard Deviation: Grouped”
The interval 20 to 30 holds 6 values. What do they contribute to the total?
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”
The scores 0, 1 and 2 have counts 6, f, 4; the mean is 0.9. What is f?
10
from “Finding a Frequency from the Mean”
The scores 1, 2 and 3 have counts 6, f, 2; the mean is 1.8. What is f?
12
from “Finding a Frequency from the Mean”