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A study is made by an auto insurance company to determine if there is a relationship between the driver's age and the number of automobile accident claims submitted during a one-year period. From a sample of 300 claims, the following information was recorded:
Age (Years)
# of Accidents Less than 25 25-50 Over 50 Total
0 37 101 74 212
1 16 15 28 59
2 or more 7 9 13 29
Total 60 125 115 300
At the time she was hired as a server at the Grumney Family restaurant, Beth Brigden was told, "You can average at least $20 a day in tips." Over the first 35 days she was employed at the restaurant
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
The dean of students believes that teh costs are greater this semester. What is the test value for this hypothesis?
To determine the public's opinion of the police department, the police chief obtains a cluster sample of 15 census tracts within his jurisdiction and samples all households in the randomly selected tracts. Uniformed police officers go door to door..
Which of the following is true about a 95% confidence interval of the mean of a given sample:
Using the .05 level of significance, what should we conclude about the theory that 24 hours is the natural cycle? (That is, does the average cycle length under these conditions differ significantly from 24 hours?)
Let T have the exponential distribution with parameter lambda, and let Y=Sqroot(T).
Your company ships a lot of packages needing quick delivery and short notice. In the past, you have used Speedy Air Delivery Service, but you are beginning to receive complaints from customers who say they are not receiving their packages on time.
etting the significance level at a very high cutoff (such as 15%) increases chances of what type of error? Why do Type II errors concern scientists? Why have confidence levels of significance been set at 5% and 1%?
a. what is the point estimate of the population mean? b. what is the point estimate of the population standard deviation?
Explain the chi-square test of homogeneity and show the formula for the test statistics for the test of homogeneity. Describe a sign and test and show the six steps of the test-of-hypothesis procedure.
An important idea in data interpretation is choosing which graph to use under which circumstances. Describe the benefits of different graphs for different sets of data:
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