1) A standard deviation measures what? The difference between the actual results
ID: 3501867 • Letter: 1
Question
1)
A standard deviation measures what?
The difference between the actual results and the predicted results
The probability of replicating a result
The difference in scores between two groups
The variation of scores within a group
2)If the correlation between variables A and B is zero, what can we conclude?
As A goes up, B does not consistently go either up or down.
A and B have the same mean, the same median, and the same distribution.
The mean value of either A or B must be zero.
If we know the value of A, we can predict the value of B with zero error.
3) What does a correlation measure?
It measures the changes in a group of people over time.
It measures the percentage of people who agree with a certain statement.
It measures the effect of an experimental procedure.
It measures the relationship between two variables.
a.The difference between the actual results and the predicted results
b.The probability of replicating a result
c.The difference in scores between two groups
d.The variation of scores within a group
Explanation / Answer
1. d.The variation of scores within a group (variance is a measure of how the data points differ from the mean . It is the average squared deviation from the mean of a set of data. Standard deviation is the square root of the variance. SD will be small if the data is close together and it will be large if the data is spread out)
2. a. As A goes up, B does not consistently go either up or down. (that is, there exisys no relationship between the two variables )
3. d. It measures the relationship between two variables. (it is a statistical procedure to measure the relationship between two variables)
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