question

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