Measures of Center
Variance
Standard Deviation
CV and Z scores
100
Placing the data in order from least to greatest and finding the data point in the middle gives you the ____.
median
100
What is the symbol for?
variance of the population
100
What is this the symbol for?
S
Standard deviation of the sample.
100
To find out how unusual a data point is you should find the _______.
z score
200
Subtracting the lowest data point from the highest data point will give you the __________.
range
200
What is the symbol for variance of the sample?
S2
200
How do you find the standard deviation if you have the variance?
Take the square root of the variance.
200
What is the formula for finding the coefficient of variation for a population?
300
(sum(n))/n
what will this formula yield?
The mean of the data
300
Roger's scores on a spelling test were
98 99 72 89 90
Which formula would you use if this is all of his test grades from spelling?
300
What is this the symbol for?
standard deviation of the sample
300
What is the coefficient of variation for a set of data that has a mean of 121 and a standard deviation of 12? Round to the nearest tenth.
0.1
400
The scores on a spelling test were
98 99 72 89 90 100 50 99 79 87
Find the 10% trimmed mean rounded to the nearest tenth.
89.1
400
Roger's scores on a spelling test were
98 99 72 89 90
Find the variance of the data. Round to the nearest hundredth.
93.84
400
Find the standard deviation of the following data:
A convenience sample was chosen using the first row on a bus. The ages of the students in the first row of a bus are:
4, 8, 10 and 11
Find the standard deviation and round to the nearest tenth.
3.1
400
The scores on a spelling test were
98 99 72 89 90 100 50 99 79 87
Find the coefficient of variation. Round to the nearest tenth
0.2
500
Roger made the following grades in math:
Tests: 89, 92
Quizzes: 78, 100, 90
He has done no homework.
If tests count 40%, quizzes count 30% and homework counts 30%, what is his weighted average?
63
500
Roger's 1st 5 out of 10 scores on a spelling test were
98 99 72 89 90
Find the variance of the data. Round to the nearest hundredth.
117.3
500
The scores on a spelling test were
98 99 72 89 90 100 50 99 79 87
Find the standard deviation rounded to the nearest tenth.
15
(14.9703)
500
The scores on a spelling test were
98 99 72 89 90 100 50 99 79 87
Find the z score for the 100. Round to the nearest tenth.
0.9