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Round to 2 decimal places. 3.79984
3.80
Round to 2 decimal places. 3.41279
3.41
Find the sample standard deviation. Round to 2 decimal places. 24 36 21 22
6.95
Find the population variance. 2 decimal places. 24 36 21 22
36.19 or 36.24
Find the median. 24 36 21 22
23
A score of 90 is at the 50th percentile. What does this mean?
50% of the scores are 90 or below.
How do you find the range of a data set?
max - min
The empirical rule says that in a bell shaped distribution, 95% of the distributions data lies within ____ standard deviation(s) of the mean.
2
In a right skewed distribution, which is greater, the mean or the median?
mean
What does a z-score of -1.23 mean?
The value is 1.23 standard deviations below the mean.
Ally scored an 87 on her test. The class average was a 86 with a standard deviation of 4.9. Find Ally's z-score.
0.20
Find the z-score if the mean is 72, the standard deviation is 3.2, and the value is 70. Round to two decimal places.
-0.63
What is the third quartile of the boy's heights?
72
What is the first quartile of the girl's heights?
63
What is the interquartile range of the girl's heights?
5
What is the range of the girl's heights?
8
What is the median height of boys?
69
What shape is this distribution?
right skewed
What shape is this distribution?
left skewd
What are the 3 measures of central tendency?
mean, median, and mode
When you find sample standard deviation in your calculator, how do you get sample variance?
Square the sample standard deviation.
What does this stand for?
sample variance
What does this symbol stand for?
population variance
The 5 number summary consists of ___________
Min, Q1, Med, Q3, Max
The median is the same as which quartile?
Second OR Q2
The z-score tells us how many __________ a value is from the mean.
Standard Deviations
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