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Fuel Consumption and Cars The purpose of an automobile's timing belt is to provide a connection between the camshaft and the crankshaft. This allows the valves to open and close in sync with the pistons. Suppose the duration of a timing belt (in miles) can be modeled by an exponential random variable with mean 100,000 miles.a. Find the value of λ.b. Find the probability that a randomly selected timing belt lasts for more than 120,000 miles.c. Find the probability that a randomly selected timing belt lasts for between 75,000 and 125,000 miles.d. If the timing belt on a new car breaks within 70,000 miles, the dealer will install a new belt free of charge. What is the probability the dealer will be forced to install a new timing belt free of charge on a randomly selected car?
Populations sampled and margins of error. Consider the following two scenarios. Which sample should have the smaller margin of error? Explain your answer
Figures for the yearly crime rate (the number of crimes per 1,000 population) in Mississippi, USA from 1993 to 2002 are as follows:
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments
each year management accounting reports the results of a salary survey of the members of the institute of management
the following table shows the results of recent study regarding gender of individuals and their selected field of
Make parallel boxplots of petal lengths for the two species.- Describe the differences seen in the boxplots.- Write a 95% confidence interval for this difference.
There is a throwing accuracy game in which a velcro board is hung on the wall (see Figure) and players throw small prickly balls that stick on the board.
It provides answers to frequently asked questions (FAQs) about forecasting. For example, one of the FAQs.
Assume the standard deviation of the distribution is 2.5pounds, what is the probability that the mean of a sample of 55 families is between 17 and 18 pounds.
Each party's position must be statistically sound. Include as suitable graphs, computations, and statistical tests.
In its Traffic Safety Facts 2005, the National Highway Traffic Safety Administration reported that 6.3% of licensed drivers were between the ages of 15 and 20, yet this age group was behind the wheel in 15.9% of all fatal crashes.- Use these stati..
A company files its sales vouchers according to their value so that they are effectively in four strata. A sample of 200 is selected and the strata means calculated.
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