Assignment _1 solutions

Assignment _1 solutions - Homework Assignment #1 Solutions...

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Unformatted text preview: Homework Assignment #1 Solutions DSCI 305 1.86 (a) From Table A, P(z < 2.85) = .9978; or using an Excel function, NORMSDIST(2.85) (b) P(z > 2.85) = 1- P(z < 2.85) = 1 - .9978 = .0022; or using an Excel function, 1 NORMSDIST(2.85) (c) P(z > - 1.66) = 1- P(z < - 1.66) = 1- .0485 = .9515; or using an Excel function, 1 - NORMSDIST(- 1.66) (d) P(- 1.66 < z < 2.85) = P(z < 2.85) P(z < - 1.66) = .9978 - .0485 = .9493; or using an Excel function, NORMSDIST(2.85) NORMSDIST(- 1.66) 1.88 (a) The z-score for the proportion of .25 is - .675 (average of - .67 and - .68); or using an Excel function, NORMSINV(.25) (b) The z-score for the proportion of 1 - .40 or .60 is .255 (average of .25 and .26); or using an Excel function, NORMSINV(1 - .40) 1.104 (a) 2 266 2 16 234 - =- = and 2 266 2 16 298 + = + = . Between 234 and 298 days. (b) 234 days or less (c) It is unlikely since 218 is three standard deviations below the mean. Only 0.15% of all women give birth in 218 days or less. women give birth in 218 days or less....
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This note was uploaded on 04/12/2011 for the course DSCI 305 taught by Professor Kim during the Spring '11 term at Western Washington.

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Assignment _1 solutions - Homework Assignment #1 Solutions...

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