STATS 2- Distributions, z-scores & p-values

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9 Terms

1
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normally distributed data

  • bell-shaped curve

  • peak = mean

  • width = sd

  • area under curve = 1

2
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2 types of non-normally distributed data

  • skewed (positive/negative

  • bimodal (2 modes)

3
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how to work out probability

number of possible outcomes consistent with event/total possible outcomes

4
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what is conditional probability

probability of an event when something else is known/assumed

5
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what do you use z-scores for

  • normally distributed population

  • finding probability of selecting a specific variable

6
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how to calculate z-score

  • x= number given in question

  • z= number of sd’s away from the mean

  • can be positive or negative

<ul><li><p>x= number given in question</p></li><li><p>z= number of sd’s away from the mean</p></li><li><p>can be positive or negative</p></li></ul>
7
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what is the standard normal distribution table used for

  • converting z-scores into probabilities

  • 2 columns proportion/probability above & below

8
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what to do when converting -z scores into probability

ignore the -

9
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what to do when finding probability in between 2 values

  • calculate z-scores for each value & convert to probabilities

  • minus probabilities from 1

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