WorksheetsWednesday Exit Ticket- Measure of Variation
Total questions: 25
Worksheet time: 1hrs 5mins
What is the range in statistics?
(Highest + lowest)/2
Highest - lowest
(Highest - lowest)/2
(Highest - lowest)2
What does variance represent?
How many different variations are in the data set.
How the population varies compared to the sample.
How spread out each data value is from the mean.
The range, but with a bunch of other stuff going on.
Before you can begin calculating the variance, you must first:
find the mean
find the median
find the mode
find the range
Once you've calculated the mean, and listed the values in a table, what is the next step to calculating the variance?
Square each value in the data set
Subtract each value in the data set from the mean
Subtract the mean from each value in the data set
Add the mean to each value in the data set
What is the difference between the formulas for population variance and sample variance?
The sample variance is the square root of the population variance.
The population variance divides the sum of the squares by n-1, while sample divides by N.
The population variance divides the sum of the squares by N, while sample divides by n-1.
There is no difference.
How do you calculate the standard deviation?
Divide the variance by 2.
Its a long process and I can't explain it right now.
Find the mean and multiply it by the variance.
Take the square root of the variance.
Calculate the mean.
μ = 10
μ = 10.5
x̄ = 10.5
μ = 11
The standard deviation describes the spread about which of the following?
median
mode
mean
range
Once you've calculated the mean, and listed the values in a table, what is the next step to calculating the variance?
Square each value in the data set
Subtract each value in the data set from the mean
Subtract the mean from each value in the data set
Add the mean to each value in the data set
What is the outlier in this data set?
{23, 60, 30, 21, 25, 35, 29}
35
21
30
60
At Donald's Donuts the number of donut holes in a bag can vary. Help Donald find the mode.
12,10,10,10,13,12,11,13,10
13
12
11
10
Which is the formula for population standard deviation?
σ=NΣ(x−μ)2
s=n−1Σ(x−x)2
Which is the formula for population mean?
x=nΣx
μ=NΣx
True or False: The variance is calculated differently depending on if you have a population or a sample.
True
False
What is the correct expression for finding sample variance?
nSSx
nΣd
(n−1)SSx
(n−1)Σd
Which Dot Plot shows the Least Variability?
A
B
