How to solve z-score problems
How to Solve z-Score Area Problems
Your book has two tables –
the “TAIL” table [pic] and the “BIG” table [pic].
REMEMBER: The whole normal curve has an area of 1.0000, and each half is .5000
“Tail” Problems
• z > POSITIVE [pic]
• z < NEGATIVE[pic]
• Just look up in “tail” table.
o Example: z > 2.41 ( .0080
o Example: z < -1.19 ( .1170
“Over Half” Problems
• z > NEGATIVE [pic]
• z < POSITIVE[pic]
• Just look up in “big” table.
o Example: z > -0.48 ( .6844
o Example: z < 2.22 ( .9868
“Same Side” Problems
• POSITIVE < z < POSITIVE [pic](between two positive numbers)
• NEGATIVE < z < NEGATIVE [pic](between two negative numbers)
• Look up both numbers in either table. (The example uses the “big” table.)
• Subtract (BIG – SMALL) to get answer.
o Example: 1.23 < z < 2.34 ( .9904 - .8907 = .0997
o Example: -1.91 < z < -0.34 ( .9719 - .6331 = .3388
“Both Sides” Problems
• NEGATIVE < z < POSITIVE [pic](between a negative and a positive)
• Look up both numbers in “tail” table
• Subtract both tails from 1 … 1 – FIRST – SECOND
o Example: -2.11 < z < 1.22 ( 1 - .0174 - .1112 = .8714
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.
Related searches
- how to solve for percent yield
- how to solve apy
- how to calculate z score
- how to solve dosage calculations
- how to solve significant figures
- how to solve for dividends
- how to solve pmt formula
- how to solve percent increase
- how to calculate z statistic
- how to solve for compound interest
- how to solve equivalent ratios
- how to solve geometry equations