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The manager fo the Petroco Service Station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor. The owner has accumulated the following data on demand for unleaded gasoline from sales during the past ten months:
Month Gasoline Demanded (gal)
Oct 800
Nov 775
Dec 630
Jan 500
Feb 645
March 690
April 730
May 810
June 1,200
July 980
Compute an exponentially smoothed forecast using an symbol a which stand for a weighting factor referred to as the smoothing constant of a value of .30
Compute an adjusted exponentially smoothed forecast with a which stand for a weighting factor referred to as the smoothing constant =.30 and B.20
Compute the two forecast by using MAPD and indicate which seems to be more accurate
Do the data indicate that the lengths of one supplier's 2x4's are subject to more variability than those of the other supplier? Assume α = 0.05. (HINT: F Test for Differences in Two Variances)
On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.
Computing the Z scores for the given data and evaluate µ and σ for the population.
Determine the probability of selecting sample with a mean of more than $100,000 but less than $112,000.
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
Compute the appropriate Test Statistic to test null hypothesis that mean of population is 4.3 against alternative hypothesis μ ≠ 4.3.
What is the probability of finding 1 or more children with chronic bronchitis in a population where the incidence rate of chronic bronchitis is 10% (like the one above?)
Write introduction to STATISTICAL PROCESS CONTROL and Explain the use of SPC tools used at D2D
P-value for test statistic is .085, determine the minimum level of significance needed to reject null hypothesis?
Calculate the mean and standard deviation for this set of data. Convert your answer back to dollars and cents and give the correlation value between number of beers consumed and BAC?
The distribution of diastolic blood pressures for the population of female diabetics between the ages of 30 and 34 has an unknown mean μd and a standard deviation σd = 9.1 mm Hg.
Find a 95% confidence interval for the mean dielectric strength of the oil.
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