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Response times for telephone repair calls. A study examined the time required for the telephone company Verizon to respond to repair calls from its own customers and from customers of a CLEC, another phone company that pays Verizon to use its local lines. Here are the data, which are rounded to the nearest hour:
(a) Does Verizon appear to give CLEC customers the same level of service as its own customers? Compare the data using graphs and descriptive measures and express your opinion.
(b) We would like to see if times are significantly longer for CLEC customers than for Verizon customers. Why would you hesitate to use a t test for this purpose? Carry out a rank test. What can you conclude?
What is the level of measurement for there is no significant difference between marital ages of men and women? and ther eis a significant difference between marital ages between men and women.
a lake contains 4 distinct types of fish. suppose that each fish caught is equally likely to be any one of these types.
Let X1, X21 • • • Xio denote a random sample of size 10 from a population which has a normal distribution with unknown mean 0 and variance a2 = 2. (a) Find the Uniformly Most Powerful (UMP) test of size a = 0.01 for testing the simple hypotheses
During 2007, sales of new, privately owned homes in the total United States and in the western states were broken down into price categories as follows: Source:
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
an instructor believes that 20 or less of the students who finish a statistics course get an a grade. a sample of 90
Find the proportion of men who died from cardiovascular disease in the high-blood-pressure group. Then calculate the odds.
What is the probability that Bob will win that wonderful trip on the basis of his gasoline sales this month?
Find the probability of each outcome.- The first two you choose are both good.- At least one of the first three works.- The first four you pick all work.
1. Interpret both the logit and the relative risk ratio on Older for the category of "None" from Model 1 and Model 3 in Table 6. What substantive conclusion do you draw from those coefficients?
Calculate the Optimal Level of Output and Maximum Profit
What is the estimate of the proporation of employees who do not use the ATM in a month? Develop a 95 percent confidence interval for the mean number of transactions per month.
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