Praxis 5003 Practice Question
Scenario/Extract:
Each of the last two years, Melanie went on an 8-day camping trip with her friends to a state park.
Both years, Melanie kept track of the number of hummingbirds she saw each day and recorded the data.
Last year's data: 0, 1, 2, 5, 5, 6, 7, 10
This year's data: 3, 4, 5, 5.5, 7, 12, 13
Which statistical measure changed from last year to this year?
Correct Answer: A
Rationale: The mean is sensitive to changes in data values, making it the most likely statistical measure to fluctuate from one year to the next. If any data points change, the mean will reflect that shift.
The median, which represents the middle value in a dataset, may remain unchanged unless the data distribution significantly shifts. The mode, or the most frequently occurring value, can also stay the same despite changes elsewhere in the dataset. Lastly, the range, defined as the difference between the highest and lowest values, might not change if the extreme values remain stable, even if other data points vary.
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