Yahoo Answers: Answers and Comments for Statistics question 10 point reward !? [Mathematics]
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enCA
Sat, 09 Jan 2010 09:00:24 +0000
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Yahoo Answers: Answers and Comments for Statistics question 10 point reward !? [Mathematics]
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https://ca.answers.yahoo.com/question/index?qid=20100109090024AAwNKzQ
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From Emily: Look up your ztable for 0.96 to get the z val...
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Sat, 09 Jan 2010 09:09:37 +0000
Look up your ztable for 0.96 to get the z value (should be about 2). The 96% CI will be:
22,500 +/ (1500 * zvalue).

From Jackie: approx 2.0545 x 1500...so 22500 + 3081.75 is ...
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Sat, 09 Jan 2010 09:18:18 +0000
approx 2.0545 x 1500...so 22500 + 3081.75 is the 96% range of salaries.

From None: Look up a table of the single tail normal dist...
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Sat, 09 Jan 2010 09:13:20 +0000
Look up a table of the single tail normal distribution to see how many standard deviations away from the mean will include 48% of the values. Then multiply this by 2 x $1500.
Hint: 2 standard deviations from the mean includes 47.7 % of the data on one side, or 95.4% of all the data for both tails, so your answer should be just a little over $3000

From Guillermo: X : salary of employees
xmean = 22500...
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Sat, 09 Jan 2010 09:12:47 +0000
X : salary of employees
xmean = 22500
sx = 1500
Pf(22500  1500*2.055< μx < 22500 + 1500*2.055) = 0.96
Pf( 19417.5 < μx < 25582.5 ) = 0.96