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An 18-minute Oil and Lube service claims that their average service time is no more than 18 minutes. A random sample of 40 service times was collected, and the sample mean was found to be 20.5 minutes, with a sample standard deviation of 3.8 minutes. Is there evidence to reject the claim at the alpha = 0.01 level? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
Create a 90% confidence interval for mean score on this placement exam for all students.
Would it be reasonable to conclude that the population mean is 63 pounds?
Cumulative frequency distribution, histogram, ogive and stem and leaf display. Calculate appropriate summary statistics. Incorporate these graphs and statistics into a well written summary
Your customers have been divided into 3 groups. The first group represents 15% of customers, and these customers spent an average of $29.76 last year.
Develop a seasonally adjusted forecast model for these sandwich sales data. Forecast demand for each season for 2004 using a linear trend line estimate for sales in 2004. Do the data appear to have a seasonal pattern?
Evaluate each of the functions below at x = 1, 2, 4, 8, and 16. Plot the graph of each function. Classify each as linear, quadratic, polynomial, exponential, or logarithmic, and explain the reasons for your classifications.
What is the aim of multiple linear regression? Discriminate analysis? Canonical correlation? Multivariate analysis of variance?
Micron Electronics makes both desktop and laptop personal computers that they sell directly to customers by phone or over the Internet.
"Use the data in the following payoff matrix and regret matrix to answer the following questions. What is the optimal decision regarding at which location(s) to purchase property using the MAXIMIN decision rule?
Let X be the number obtained on the blue die minus the number obtained on the red die. Draw a histogram for its probability function and a graph for its distribution function.
Attended a religious service at least once a month, 20 stopped to help a person with car trouble. At the 0.05 significance level, test the claim that the two proportions are equal.
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