PSY201 9.11.13 To Post

78 falls between 84 and 98 your z score step 4 find

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

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.

Ask a homework question - tutors are online