Ch. 2 Review (2.1, 2.4, 2.5, 2.6)
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Mathematics
•
12th Grade
•
Hard
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the mean in a data set?
Back
The mean is the average of all data points, calculated by summing all values and dividing by the number of values.
Tags
CCSS.6.SP.B.5C
2.
FLASHCARD QUESTION
Front
What does standard deviation measure?
Back
Standard deviation measures the amount of variation or dispersion in a set of values.
3.
FLASHCARD QUESTION
Front
What is a percentile?
Back
A percentile indicates the value below which a given percentage of observations fall.
Tags
CCSS.6.SP.B.5C
4.
FLASHCARD QUESTION
Front
What is the empirical rule in statistics?
Back
The empirical rule states that for a normal distribution, approximately 68% of data falls within one standard deviation of the mean, 95% within two, and 99.7% within three.
Tags
CCSS.HSS.ID.A.4
5.
FLASHCARD QUESTION
Front
If a test has a mean of 80 and a standard deviation of 9, what is the z-score for a score of 76?
Back
Z-score = (X - mean) / standard deviation = (76 - 80) / 9 = -0.44.
6.
FLASHCARD QUESTION
Front
What is the significance of a z-score?
Back
A z-score indicates how many standard deviations an element is from the mean; it helps in understanding the position of a score in a distribution.
7.
FLASHCARD QUESTION
Front
What percent of data lies within one standard deviation of the mean in a normal distribution?
Back
Approximately 68% of the data.
Tags
CCSS.HSS.ID.A.4
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