1. The sample deviation of sodium concentration in whole blood (mEq.pdf

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1. The Retread Tire Company recaps tires. The fixed cost of the recapping operations is $60,000. The variable cost of recapping a tire is $9. The company charges $25 to recap a tire. A. For an annual volume of 12,000 tires, determine the total cost, total revenue, and profit. B. Determine the break-even volume for the Retread Tire Company operation. Solution (A)Formula is : Total cost = Fixed Cost + Total Variable Cost * Fixed Cost-60,000 *Total Variable Cost= 108,000 ( 9 x 12,000) *Total Cost= 168,000 (108,000+60,000) * Profits- 132,000 (300,000 -168,000) *Total Revenue- 300,000 ( 12,000 x 25) Answer: The total cost is 168,000, the total revenue is 300,00, and the profit is 132,000. (B)Answer: The break even volume for retread Tire Company operation is 3750 because you subtract 9-25, then divide it by 60,000= 3750. So the break even volume is 3750..

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1. The sample deviation of sodium concentration in whole blood (mEq/L) for m=20 marine eels
was found to be s1= 40.5, whereas the sample standard deviation of concentration for n=20
freshwater eels was s2= 32.5. Assuming normality of the two concentration distributions, test at
level .10 to see whether the data suggests any difference between concentration variances for the
two types of eels. (use f test)
Solution
F=s1^2/S2^2=(40.5^2/32.5^2)=1.552
for (19,19 df and 90% confidence ) F from table is:1.822
since the calculated value is less than table value there is no difference in variance

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