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Make an Excel graph of the data on U.S. diesel new car sales. (b) Discuss the underlying causes that might explain the trend. (c) Use Excel, MegaStat, or MINITAB to fit three trends (linear, quadratic, and exponential) to the time series. (d) Which trend model do you think is best to make forecasts for the next 3 years? Why? (e) Use each of the three fitted trend equations to make numerical forecasts for 2004, 2005, and 2006. How much difference does the choice of model make? Which forecasts do you trust the most, and why? (f) If you have access to Ward's Automotive Yearbook, check your forecasts. How accurate were they?
U.S. Diesel New Car Sales, 1993-2003Year Sales1993 2,8001994 3,5771995 3,1391996 8,4691997 7,3311998 10,9721999 13,5732000 22,6342001 15,0772002 31,4302003 38,524
Find the critical value for different types of sample size and level of significance:
About 5.5 percentage points in either direction from what would have been obtained by seeking out all Ohio State University female students." Do your results agree with this statement?
Findout the percentage of trainees earns less than $900 a month utilizing normal distribution.What percentage of trainees earns less than $900 a month?
What advantage does correlation have over a cross-tab?
A 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the other will fail? Show all steps carefully.
In a random sample of 10 on-line statistics students, information was collected about their minutes studied and their chapter test scores. Is this relationship positive, negative or no relation?
Dating In Chances- Risks and Odds in Everyday Life, James Burke claims that about 70 percent of all single men would welcome a woman taking the initiative in asking for a date. A random sample of 20 single men was asked if they would welcome the woma..
Suppose that the probability is 1 in 3,900,000 that a single auto trip in the U.S. would result in the death of the driver. Over a lifetime, an average U.S. driver takes 50,000 trips.
With the sample standard deviation of 12 lbs. Determine the 90% confidence interval of true mean weight of all college wrestlers.
To find out whether two categorical variables are independent, one should use the.
The diameters of oranges in the certain orchard are normally distributed with the mean of 5.26 inches and a standard deviation of 0.50 inches.
The announced margin of error is plus or minus 3 percentage points. The announced confidence level is 95%. What is the value of the sample proportion.
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