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| Bounty | Status | Category | Sub-Category | Question | Due | $0.75 | Closed, closed | Mathematics | Statistics |
Statistics Question
A random sample of 41 observations was selected from a normally distributed population. The sample mean was x bar= 46, and the sample variance was s 2 = 68.0. Does the sample show sufficient reason... |
Dec. 16, 2009 | $0.50 | Closed, closed | Mathematics | Statistics |
Statistics Question
A sample of size n = 20 is selected from a normal population to construct a 98% confidence interval estimate for a population mean. The interval was computed to be (6.80 to 11.20). Determine the... |
Dec. 16, 2009 | $0.75 | Closed, closed | Mathematics | Statistics |
Statistics Question
A machine produces 3-inch nails. A sample of 12 nails was selected and their lengths determined. The results are as follows: 3.02 2.95 2.96 2.96 2.90 2.92 3.02 2.93 3.07 3.07 3.00 2.91... |
Dec. 16, 2009 | $2.00 | Closed, closed | Mathematics | Statistics |
Statistics Question
Two groups of ten sprinters run 100 meters. The times required by sprinters in the first group are as follows: 10.7 11.6 14.9 12.4 13.2 10.3 10.4 12.1 11.8 10.8 The times required by... |
Dec. 13, 2009 | $2.00 | Closed, closed | Mathematics | Statistics |
Statistics Question
A telephone survey gives 11 consumers two choices: Do they prefer Coke or Pepsi? Exactly 9 of those surveyed state that they prefer Coke. Assuming that = 0.02, test the hypothesis that the... |
Dec. 13, 2009 | $1.00 | Closed, closed | Mathematics | Statistics |
Statistic Question
The US Mint selects ten pennies from the production line to test the hypothesis that the mean weight of each penny is 4 grams. The normally-distributed weights (in grams) of these pennies are as... |
Dec. 13, 2009 |
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