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Stats, Chapter 8
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Terms in this set (25)
If a distribution has a mean of 25 and a standard deviation of 2, what value would be -4 standard deviations from the mean?
17
_______ of scores fall within one standard deviation of the mean.
68%
The ____________ is the most commonly used standard score.
z score
Which of the following is a characteristic of the normal curve?
Mean, median, mode are the same
Both t scores and z scores are considered what type of score?
Standard scores
If a distribution has a mean of 50 and a standard deviation of 5, what value would be -1 standard deviation from the mean?
45
What is the foundation of inferential statistics?
Probability
z scores that fall above the mean will be _____________.
Positive
If a distribution has a mean of 100 and a standard deviation of 15, what value would be +2 standard deviations from the mean?
130
________ of scores fall on either side of the distribution.
50%
If a distributing has a mean of 1,000 and a standard deviation of 100, how many standard deviations is 600 from the mean?
-4
A score that is 2.5 standard deviations below the mean would have a z score of _______.
-2.5
The entire normal curve contains ________ of scores
100%
What is the t score of -1?
40
What is the basis for the national curve?
Probability
To calculate a z score, you subtract:
The mean from the raw score and divide this difference by the standard deviation
If a distribution has a mean of 30 and a standard of 5, how many standard deviations is 60 from the mean?
6
If a distribution has a mean of 50 and a standard deviation of 25, how many standard deviations is 0 from the mean?
-2
Which of the following is true of z scores that fall below the mean?
They are negative
A score that is there standard deviations above the mean would have a z score of ______.
3
In statistics, the most common standard is to have at least a _______ level of confidence.
95%
What is the t score for a z score of +3?
80
z scores that fall below the mean will be ________________.
Negative
Which of the following is another name for the normal curve?
Bell-shaped curve
Under the normal curve, approximately what percentage of scores fails between -1 and +1 standard deviations around the mean?
68%
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