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STAT 201 Week 7 Power Point

# STAT 201 Week 7 Power Point - STAT201Recitation Week7...

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Click to edit Master subtitle style  9/26/11 STAT201 Recitation Week 7

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9/26/11 Typical Questions for sampling Distribution Sample mean  (…take  a sample of  …, what is the probability  that the  mean/average  will….)   Sample proportion  ( … of …do sth… take  a sample of  …,  what the probability that ..% or … in the sample will..) / x z n μ σ - = Parameters  u,  , n, x- σ bar Z- chart Prob .? (1 ) p z n π π π - = - Parameters , П p, n Z- chart Prob .?
9/26/11 Example on Sample Mean  The Baily Hill Bicycle Shop sells mountain bikes and  offers a maintenance program to its customers. The  managers has found the average repair bill during the  maintenance program’s first year to be \$15.30 with a  standard deviation of \$7.00. What is the probability a random  sample of 40 customers will have a mean repair cost  exceeding \$16.00? μ=\$15.30 ; =\$7.00; n=40; x-bar=16 x 16 16 15.30 0.63 / 7 / 40 x z n μ σ - - = = = Z-chart (0.2357)

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9/26/11 Example on Sample Proportion A major video rental chain recently decided to allow
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STAT 201 Week 7 Power Point - STAT201Recitation Week7...

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