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Unformatted text preview: ercentage (based on 50%
34%
14%) 50% + 34% = 84% Your Z score Step 3: Make a rough es@mate of shared area’s percentage (based on 50%
34%
14%) 50% + 34% + 14% = 98% Your Z score Step 3: Make a rough es@mate of shared area’s percentage (based on 50%
34%
14%) 6 9/10/13 50% + 34% + 14% = 98% Your Z score Step 3: Es@mate: Our Z
score of 1.78 falls between 84% and 98% Your Z score Step 4: Find exact percentage using the normal curve table, adding 50% if necessary Your Z score 7 9/10/13 Your Z score Is 46.25 our ﬁnal answer? Your Z score No, we have to add 50%... Final answer is 96.25% 8 9/10/13 Your Z score 96.25% of scores fall below a Z score of 1.78 Check that this ﬁts with our es@mate (84 to 98) Steps for ﬁguring percentage area above or below a par@cular raw or Z score: 1. Convert raw score to Z score 2. Draw a normal curve, locate the area where the Z score falls on it, and shade in the area for which ﬁnding percentage 3. Make rough es@mate of shaded area’s percentage (using 50%
34%
14% rule) Steps for ﬁguring percentage area above or below a par@cular raw or Z score (cont’d): 4. Find exact percentage using normal curve table (pp. 671
674) If needed, add or subtract 50% from this percentage Check that exact percentage is within es@mated range (from Step 3) 9 9/10/13 You can also use a similar process to: Find Z scores that correspond to a par@cular percentage of scores Find what percentage of scores occur between any two par@cular Z scores The length of conversa@ons between supervisors and workers in a certain store is normally distributed with a mean of 4.0 minutes and a standard devia@on of 0.8 minutes. a.
b.
c. What percentage of conversa@ons are longer than 4.4 minutes? Shorter than 2 minutes? Between 3 minutes and 5 minutes? Popula.on: En@re group of people for which researcher intends...
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This note was uploaded on 03/24/2014 for the course PSY 21201 taught by Professor Bernard during the Winter '13 term at SUNY Stony Brook.
 Winter '13
 bernard
 Psychology

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