Randomly selected people
The daily intakes of milk (in ounces) for ten randomly selected people were:
19.9 20.2 18.7 31.5 13.8 12.6 15.2 31.4 13.4 24.5
Find a 99% confidence interval for the population standard deviation.
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Several psychology students are unprepared for surprise true/false test with 15 questions, and all of their answers or guesses. Determine the mean and the standard deviation for the number of correct answers for such students.
How much must be deposited in the account that pays 3.9% interest compounded continuously to make annual payments of $4,000 starting eight years from now?
To accumulate $5,000, the individual makes 6 semiannual payments into the sinking fund which pays 6.2% interest compounded semi-annually.
Amount is to be repaid on 7.1 of same year. What amount is required to settle debt at the end of term? Use four possible combinations of time and interest.
A machine produces nails with the target mean length of 3 inches and historical standard deviation of 0.09 inches. A sample of 30 nails is selected, and it is found that the sample mean is 2.90 inches.
How much, if any, of he contribution can be claimed as the deduction for 2013? What occurs to any portion not deductible for 2013?
What is needed by the homogeneity of variance assumption? The pooled variance has a value between the two sample variances.
Thus, sample statistics are usually not identical to their corresponding population parameters. The error or discrepancy between a statistic and the corresponding parameter is called sampling error.
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