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We want to design a new placebo-controlled trial to evaluate an experimental medication to increase lung capacity. The primary outcome is peak expiratory flow rate, a continuous variable measured in liters per minute. The primary outcome will be measured after 6 months on treatment. The expected peak expiratory flow rate in adults is 300 with a standard deviation of 50. how many subjects should be enrolled to ensure 80% power to detect a difference of 15 liters per minute with a two-sided test and significance level of 0.05?
Rosa's Italian restaurant wants to develop forecasts of daily demand for the next week. Develop a forecasting chart, using MS Excel. Include the steps used in your forecast.
Develop a 99% confidence interval for the population proportion.
Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
Determine the probability distribution associated with these data.
The difference between expected payoff under certainity and expected value of the best act without certainity is the expected:
Find a 95% confidence interval for the difference in the proportion of deaths between the streptokinase and the control group.
A random sample of 77 eighth grade students' scores on a nation mathematics assessment test has a mean score of 278 with a standard deviation of 31.
The random variable x is known to be uniformly distributed between 70 and 90. The probability of x having a value between 80 to 95 is
A manufacturer of printed circuit boards uses exponential smoothing with trend to forecast monthly demand of its product. At the end of December, the company wishes to forecast sales for January.
What is Excel formula in B9 giving first value of coefficient in the objective function?
Select either the Least Squares Method, the Moving Average Method, or the Weighted Moving Average and provide step-by-step instructions you would employ to plot the associated trend line.
he Department of Motor Vehicles (DMV) can service customers at a rate of 20 per hour (or 1/3 per minute) when it comes to license renewals. The service time follows an exponential distribution.
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