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Manufacturer of mole and gopher poison has experienced the following monthly demand for an environmentally sound pesticide poison.
Month Actual demand (in cases)February 640March 840April 770May 950June 875
a. Using a Average method, what would the forecast have been for July?b. What would the unweighted three-month simple moving average have been for July?c. Which forecasting method would you recommend? Why?
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
Bill is completing a project for you in the marketing department. In conducting his anaysis regarding consumer behavior and a new product that has been released, he tells you the correlation between these two variables is 1.09.
Determine fraction of employees cost between $1,500 and $2,000 per year?
If employee is chosen at random, determine the probability that employee is female and salaried staff? Choose the best answer from the following.
A sample proportion is calculated from a sample size of 394. How large of a sample would we need in order to decrease the standard error by a factor of 9?
Choose one time-series describing Airlines and make a line chart. Describe the trend (if any) and discuss possible causes. Fit both a linear and an exponential trend to the data.
What is the standard error of estimate? Describe with an example. What are the coefficients of the linear regression model and what do they mean? What are the various statistics reported in a regression output?
The national average SAT score (for Verbal and Math) is 1028. If we assume a normal distribution with σ = 92, what is the 90th percentile score? What is the probability that a randomly selected score exceeds 1200?
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
Study is conducted as to whether there is relationship between joggers and consumption of nutritional supplements.
The average time a subscriber spends reading the Wall Street Journal is 49 minutes. Assume that the standard deviation is 16 minutes and the time are normally distributed .
Discuss the use of standard deviation. Explain how it might be useful to you in your research and how you would explain results using standard deviation.
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