5.1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What's a normal distribution? | a continuous probability distribution for random variable x.
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| What's a normal curve? | a graph of norm dist.
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| What's normal distribution property #1 | 1. mean, median, mode are equal.
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| What's normal distribution property #2 | 2. normal curve is bell shaped and symmetric about the mean.
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| What's normal distribution property #3 | 3. total area under normal curve equals 1.
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| What's normal distribution property #4 | 4. normal curve approaches, but never touches, the x-axis as it extends further away from mean.
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| What's normal distribution property #5 | 5. B/w u-o & u=o (in the center of the curve) graph curves upward to the left of u-o & to the right of u+o.
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| what are inflection points | points at which curve changes from curving upward to curving downward
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| what's the formula to find the z-score? | (x-u)/o
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| What's a standard normal distribution? | normal distribution with mean of 0 and standard deviation of 1
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| what are the properties of a standard normal distribution? | (1).cumulative area (CA) is close to 0 for z-scores close to z=-3.49 (2) CA increases as z-scores increase (3) CA for z=0 is .5000 (4) CA is close to 1 for z-scores close to z=3.49
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| how do you find the area to left of z score | use stand norm table.
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| dow do you find area to right of z score | b. 1 - (left of z, use table to find)
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| how do you find area between 2 z-scores | find area to left of each z-score using table. Subtract high from low #.
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| what's the area to LEFT of z=1.23? | Area to left=.8907 (coordinates: 1.2, .03)
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| What's the area BETWEEN z=1.23 and z=-.75? | 1.23=.8907, -.75=2266, so area b/w=.8907-.2266=.6641
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| What's the area to RIGHT of z=1.23? | Area to right=1-.8907=.1093
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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