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The number of employees on the payroll at a food processing plant is recorded at the start of each month. These data are provided in the attached file. a. Is there a seasonal pattern in these data? If so, how do you explain this seasonal pattern? Also, if necessary, deseasonalize these data using the ratio-tomoving-average method. b. Forecast this time series for the first 4 months of the next year using the most appropriate method. Defend your choice of forecasting method.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
Determine the mean and standard deviation of this distribution?
Utilize the given degree of confidence also sample data to construct a confidence interval for population proportion.
Marie claims she can predict the sex of pregnant women's babies for first-time new mothers. She sees 1000 women a year, and she always predicts a female. She charges $1000 for a prediction
How should she proceed? What additional data (if any) is needed? Which statistical analysis technique should be used? Can an analysis be performed? Why or why not?
Discuss any limitations (inaccurate data; incomplete information; not enough samples for testing)can have an regression analysis.
Given a sample size of 9,245, a sample mean of 38, a standard deviation of 8.15, and a confidence level of 97%, calculate the lower bound of the confidence interval.
A study suggested that personality type is related to heart disease. Specifically, type A people,who are competitive, driven, pressured, and impatient, are more prone to heart disease.
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
In other words, could you generate two sets of random numbers (of length, say, 50) and set out the calculations in detail to determine whether the random variables are independent using chi-squared.
The standard deviation is estimated to be 0.279. Use the 99% level of confidence.
Five test vehicles of each kind were crashed, with results given below. Research question: Are mean crash damages the same for these 3 vehicles?
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