PRETEST Statistics and Sampling Concepts

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•
Mathematics
•
7th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the mean of a data set?
Back
The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.
2.
FLASHCARD QUESTION
Front
What happens to the mean when the lowest score is removed?
Back
Removing the lowest score typically increases the mean of the remaining scores.
3.
FLASHCARD QUESTION
Front
What is a representative sample?
Back
A representative sample accurately reflects the characteristics of the larger population from which it is drawn.
4.
FLASHCARD QUESTION
Front
What is the interquartile range (IQR)?
Back
The interquartile range is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, representing the middle 50% of the data.
5.
FLASHCARD QUESTION
Front
How do you calculate the interquartile range?
Back
To calculate the IQR, first find Q1 (25th percentile) and Q3 (75th percentile), then subtract Q1 from Q3 (IQR = Q3 - Q1).
6.
FLASHCARD QUESTION
Front
What is data in the context of experiments?
Back
Data refers to the information collected from experiments, which can be organized into charts and graphs.
7.
FLASHCARD QUESTION
Front
What is a biased sample?
Back
A biased sample is one that does not accurately represent the population, often due to the method of selection.
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