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Question: Seatbelts II. Police estimate that 80% of drivers now wear their seatbelts. They set up a safety roadblock, stopping cars to check for seatbelt use.
a) How many cars do they expect to stop before finding a driver whose seatbelt is not buckled?
b) What's the probability that the first unbelted driver is in the 6th car stopped?
c) What's the probability that the first 10 drivers are all wearing their seatbelts?
d) If they stop 30 cars during the first hour, find the mean and standard deviation of the number of drivers expected to be wearing seatbelts.
e) If they stop 120 cars during this safety check, what's the probability they find at least 20 drivers not wearing their seatbelts?
Make up a scatter diagram with 10 dots for each of the following:
Translate the following arguments into symbolic form.- If asbestos workers sue their employers, then if punitive damages are awarded, then their employers will declare bankruptcy.
Is there any evidence that the true mean amount of fuel in these cartridges is less than the advertised amount? Assume σ = 3.6 and use a = 0.05.
What is a scatterplot? - What happens when a scatterplot shows the relationship to be curvilinear?- What is a regression equation? How might an employer use a regression equation?
Recently, research efforts have focused on the problem of predicting a manufacturer's market share by using information on the quality of its product.- Estimate the simple linear regression relationship between market share and product quality rati..
The number of hours spent online by college students is claimed to be 22.5 hours per week with a standard deviation of 2.1 hours.
What is the expected value of X?- Write a sentence that interprets the expected value of X in this situation.- Create a table that gives the cumulative probability distribution for X.
A local television station plans to drop four Friday
test the slope of the regression line for the following data. use alpha equals .01.x 139 118 104 88 66 29 25y 26 30 48
The experiment data in below table was to evaluate the effects of three variables on invoice errors for a company. Invoice errors had been a major contributor to lengthening the time that customers took to pay their invoices and increasing the acc..
Assume normality. Find a 99% confidence interval for the population mean penetration depth.- Is there any evidence to suggest the population mean penetration depth is less than 120 feet?
What is the null and alternative hypothesis? What is your final conclusion?
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