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A recent survey indicated that the average yearly salary of middle school teachers in Wichita, Kansas, is 45,000 with a median of 38,000. Is this salary distribution normal? If not, which direction
An investigator at a diet center is interested in the habits of clients entering his center's weight loss program. Given the pairs of observations below, where X = number of hours per week spent wat
In clinical trials a certain drug has an 8% success rate of curing a known disease. If 8 people are known to have the disease. What is the probability of:
A population has a standard deviation of 22 units. (Give your answers correct to two decimal places.) Find the standard error for the mean if n = 14.
What is the probability that the officer checks Tom's meter 4 times and gives him a ticket on the 4th time? (The officer did not give a ticket the first 3 times.)
A box contains 18 working transistor and 7 defective transistors. You select 5 transistors from this box and solder them onto a circuit board. If you solder any defective transistors onto the circui
Assume a flipping a coin has a 50 - 50 chance of heads or tails. You flip a coin until the first time it comes up tails. What is the probability that it will take exactly three flips.
The time X it takes to reboot a certain system has Gamma distribution with E(X) = 20 min and Std(X) = 10 min. Compute parameters of this distribution.
In a recent survey of 1000 U.S adults, 19% are concerned that their taxes will be audited by the Internal Revenue Service. The surveys margin of error is plus or minus 3%. Translate the statement in
An electronic fuse is produced by two production lines in a manufacturing operation. Assume that both production lines are independent and produce fuses at the same rate and the probability of a de
What is the point estimate of the population mean. A significance level of .05 is the same as a confidence level of ? What is the 90% confidence interval estimate of the mean if n is 45?
For each of the following combinations of values, decide whether the combination is possible or impossible, and if it's impossible, explain why.
Define random variables Y1 and Y2. What distribution does Y1+Y2 follow? What distribution does Y1 and Y2 follow? Given that there are a total of 6 defective fuses among both lines, what is the probab
Discuss the following statements and explain why they are true or false: Increasing the number of predictor variables will never decrease the R^2.
In a raffle with 100 tickets, 10 people buy 10 tickets each. Ifthere are 3 winning tickets drawn at random find the probability that:
A random sample size 43 is to be selected from a population that has a mean = 46 and a standard deviation of 17. Find the mean of this sampling data (nearest whole number). What is the probability t
What is the probability a single color vehicle will have exactly 2 paint defects? What is the probability a two-tone vehicle will have exactly 1 paint defect? What is the probability a single color ve
One of the requirements of linear regression is homoscedasticity of the residuals. This means that ___________________.
To test the significance of an individual regression coefficient, we would conduct a _________________ and look for p-values smaller than 0.05.
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. What is the probability that in this grou
Suppose that the amount of time between consecutive surges in an electricity network has an exponential distribution with rate of one surge every fifteen days.
The owner of a small convenience store is trying to decide whether to discontinue selling magazines. He suspects that only 5% of the customers buy magazines and thinks that he might be able to sell
Use graphical sensitivity analysis to determine the range of values of the probability of state of nature s1 over which each of the decision alternatives has its largest expected value.
Compare the standard deviation of Wayne's estimate with the standard deviation of the sample mean. Given your answer to (b), why does Wayne's estimate not make good sense scientifically?
John retired a little less than a year ago after 25 years in the Lake Oswego police department. He had steadily moved up the ranks and retired as a captain.