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A car manufacturer asserts that with the new collapsible bumper system, the mean body repair cost for the damage sustained in a collision impact of 15 miles per hour does not exceed $400. To test the validity of this claim, 6 cars are crashed into a barrier at 15 miles per hour and their repair costs recorded. The mean and standard deviation are found to be $458 and $48, respectively. At the α = .05 signi?cance level, does the test data contradict the manufacturer's claim that the repair cost does not exceed $400? You may assume the sample was taken from a normal population.
In forecasting, MacDonald's Wing® discovered that when it opened its store to the public, it was able to sell 5,000 parachutes in the first year. Given the equation; y=a+bx. Where ‘y' represents the number of sales and ‘a' is the number they start..
Can we use that sample for to calculate the point estimate of population mean? What are the values for estimator of population mean with and without trim?
The marketing manager of a company that manufactures and distributes farming equipment (such as combine harvesters, ploughs and tractors) recorded the number of farming units sold quarterly for the period 2008 to 2011.
Regression and inferential statistics: A news headline states "a recent study found that the financial performance of an hospital seems to be related
Identify the null and research hypotheses for a one-sided test, using both words and mathematical symbols.
In Eurelia there are three categories of bicycle license, with different fees for each. The table below is based on a random sample of 122 Eurelian bicycle-license holders.
A tire manufactturer claims that its tires will last an average of 40,000 miles with Standard Deviation of 3000 miles.
What is the probability that the boat dock will be idle? If required, round your answer to two decimal places.
The partially completed ANOVA table for a randomized block design is presented here:
Do all three prototypes have the same average range? Construct an ANOVA table, and carry out the test. Explain your results.
At the end of two weeks, she has traveled both routes five times and can compare their average commuting times. Why should she not use the t -tools for two independent samples? What should she use?
Suppose data collected by observers at randomly selected intersections across the country revealed that in a sample of 85 drivers 60 were using their cell phones. Compute a 97% confidence interval for p, the true driver cell phone use rate.
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