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# Refer to the Darvas Box trading model of problem 6–38. The average profit was 11.46%.12 If the sample standard deviation was 8.2%, give a 90% confidence interval for average profit using this trading system. Problem 6–38. According to the Darvas Box stock trading system, a trader looks at a chart of stock prices over time and identifies box-shaped patterns. Then one buys the stock if it appears to be in the lower left corner of a box, and sells if in the upper right corner. In simulations with real data, using a sample of 376 trials, the average hold time for a stock was 41.12 days.11 If the sample standard deviation was 12 days, give a 90% con- fidence interval for the average hold time in days confidence interval for the proportion of people in the given age group who may be successfully treated with the facial cream.

Refer to the Darvas Box trading model of problem 6–38. The average profit was 11.46%.12 If the sample standard deviation was 8.2%, give a 90% confidence interval for average profit using this trading system.

Problem 6–38.

According to the Darvas Box stock trading system, a trader looks at a chart of stock prices over time and identifies box-shaped patterns. Then one buys the stock if it appears to be in the lower left corner of a box, and sells if in the upper right corner. In simulations with real data, using a sample of 376 trials, the average hold time for a stock was 41.12 days.11 If the sample standard deviation was 12 days, give a 90% con- fidence interval for the average hold time in days confidence interval for the proportion of people in the given age group who may be successfully treated with the facial cream.

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