stat100_ch8

stat100_ch8 - Chapter 8 Topics percentiles and their...

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Chapter 8 Topics - percentiles and their meaning - normal curve: special type of symmetric - standardized scores - standardized scores for a normal curve or normal distribution: the standard normal - percentiles and proportions for standard normal scores using Table 8.1 - finding observed value from a percentile We talked last week about shapes of data (symmetric or bell-shaped, right or positively skewed, and left or negatively skewed) and the relationships between the mode, mean and median in such distributions, especially when the shape is skewed. Now we are going to discuss a special bell- shaped curve called the “normal curve” and a table associated with this normal curve called the “standard normal table”. This table is Table 8.1 of your text on page 157. NOTE: for exams and quizzes you will be told in the question whether to consider the data to be normal or approximately normal (consider these two the same!). A standardized score or z-score is simply the number of standard deviations an individual falls above or below the mean for the whole group. The z-score formula looks like this:

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stat100_ch8 - Chapter 8 Topics percentiles and their...

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