Which of the following measures show how scores differ from the mean?
answer
variability
question
Which of the following is not a measure of variability?
answer
mean
measures are: range, standard deviation, variance
question
In order to calculate the variance, which of the following must you know?
answer
mean
if you know the standard deviation of a set of scores you know the variance
question
What is another term for variability?
answer
spread or dispersion
question
What are the three tools used to assess variability?
answer
range, standard deviation, variance
question
Which measure of variability is easiest to calculate?
answer
range
question
Which measure of variability is most general, and hence least useful?
answer
range
question
Which measure of variability should never be used alone to reach conclusions regarding the variance of a distribution?
answer
range
question
Which measure of variability is a measure of the average distance from the mean?
answer
standard deviation
question
What is the range for the following set of scores: 29, 48, 22, 37, 55?
answer
55-22=33
question
What is the range for the following set of scores: 34, 14, 17, 57, 22?
answer
43
question
What is the range for the following set of scores: 117, 249, 326, 47, 442?
answer
395
question
If you have a lowest score of 21 and a range of 47, your highest score will be:
answer
68
question
Which of the following measures how different scores are from one particular score?
answer
variability
question
What is the most common measure of variability?
answer
standard deviation
question
When reporting descriptive data such as the Mean, what additional information should also be reported that expresses how different the scores are in the distribution?
answer
( averages and variability)
question
If you subtract the smallest number in the distribution from the largest, what type of variability is being calcuated?
answer
range
question
In the formula for computing the range, what does the letter "h" represent?
answer
highest score in the data set
question
In the formula for computing the range, what does the letter "l" represent?
answer
lowest score in the data set
question
This is used to represent the range:
answer
r
question
The highest score minus the lowest score is equal to:
answer
the exclusive range r=h-l
question
The highest score minus the lowest score plus one is equal to
answer
the inclusive range r=h-l+1
question
In the formula for calculating the standard deviation, what does the Greek letter ""sigma represent?
answer
find the sum of what follows ( summation)
question
In the formula for calculating the variance, what does the letter "n" represent?
answer
sample size
question
When calculating the standard deviation, what must be done in order to obtain an unbiased estimate?
answer
subtract 1 from n n-1
question
Which of the following sets of scores has the greatest variability?
answer
7,10,11,15,19
question
Which of the following sets of scores has the least variability?
answer
5,4,5,6,5
question
Variability is a measure of how much individual scores differ from the ______________.
answer
mean
question
What is the formula for calculating the exclusive range?
answer
r= h-l
question
What is the formula for calculating the inclusive range?
answer
r= h-l+1
question
The sum of the absolute value of the deviations from the mean divided by the number of scores is equal to:
answer
mean deviation ( also called the mean absolute deviation)
question
The sum of the deviations from the mean will always be equal to ______________.
answer
zero (0)
question
What is obtained by squaring the standard deviation
answer
we get rid rid of the negative sign so that when we do eventually sum them, they do not add up to 0
question
What is obtained by taking the square of the variance?
answer
the same units with which we originally started
question
Which of the following is one way to represent the standard deviation?
answer
S or SD
question
Which of the following is one way to represent the variance?
answer
s2=sigma ( x-x)2/ n-1
2.342 or 5.48
question
Unbiased estimates are described as:
answer
when we subtract 1 from n
page 43
question
Unbiased estimates
answer
page 43
question
What is the range for the following set of scores: 10,15,12,18,19,16,12?
answer
9
question
What is the standard deviation for the following set of scores: 10,15,12,18,19,16,12?
answer
3.36
question
What is the variance for the following set of scores: 10,15,12,18,19,16,12?
answer
11.28
question
What is the range for the following set of scores: 20,24,26,22,18,16,18?
answer
10
question
What is the standard deviation for the following set of scores: 20,24,26,22,18,16,18?
answer
3.60
question
What is the variance for the following set of scores: 20,24,26,22,18,16,18?
answer
12.935
question
Which of the following sets of data has no variability?
answer
the one with less change between numbers
ex 4,4,4,4
question
What is the square of the standard deviation?
answer
is step #4 page 41 ??
variance
question
What is the square root of the variance?
answer
simply the standard deviation squared
s2=s x s
question
If (X-M)=235, and n = 29, what is "s"?
answer
2.85???
question
Which of the following must also be known in order to compute the standard deviation?
answer
mean
question
Biased estimates can be used:
answer
only to describe the characteristics of the sample
question
Unbiased estimates can be used:
answer
if you intend to use the sample as an estimate of a population parameter
question
When using sample estimates to estimate population parameters, you should use:
answer
unbiased statistic
question
As your sample size grows larger, the n-1 adjustment for the standard deviation has a:
answer
unbiased estimate
force the standard deviation to be larger
question
As your sample size grows larger, your standard deviation will be:
answer
the less of a difference there is between the biased and the unbiased estimates of the standard deviation.
question
If n = 24 and s = 1.56, what is the variance?
answer
2.43????
question
If you have a variance of 9, your standard deviation will be:
answer
3
square root of 9
question
The variance is more difficult to interpret than the standard deviation
answer
false
question
Unbiased estimates are considered to be less conservative estimates.
answer
false?? page 43
question
The standard deviation is sensitive to extreme scores.
answer
true
question
The exclusive range is more commonly used in research articles as compared with the inclusive range.
answer
true
question
A greater standard deviation indicates less variance.
answer
false??
A small standard deviation (relative to the mean score) indicates that the majority of individuals (or data points) tend to have scores that are very close to the mean.
. a sample with a large standard deviation (relative to the mean score) tends to have cases that are more widely spread-out from the mean
question
A standard deviation equal to 0 indicates no variance in your data.
answer
true??
question
It is possible for a set of data to have no variability.
answer
true
question
If you have a standard deviation of 5, your variance will be:
answer
25
square of 5 x5
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