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A painter has learned that the time it takes her to paint a random room in a house is normally distributed with a mean of 4 hours and a standard deviation of 45 minutes. id she is just starting work
Calculate a point estimate of the standard deviation. (Round your answer to two decimal places.) What proportion of the observed variation in runoff volume can be attributed to the simple linear reg
To determine the efficiency of the current ticket operation, Mike wishes to examine several queue operating characteristics. Find the average number of moviegoers waiting in line to purchase a ticket.
However, if she gives a medium or easy test, there is a 0.5 probability that her next test will be of the same difficulty and a 0.25 probability for each of the other two levels of difficulty. Const
Let X0,X1,X2, be a Markov chain with state space {1, 2} and transition probabilities given as follows: p11 = 0.3, p12 = 0.7, p21 = 0.5, p22 = 0.5. Find the invariant probability of the chain. Find P
Use the given sample data to test the claim that p1 > p2. Use a significance level of 0.01
The mean weight for a random sample of 16 ball bearings is 28.4 g with a standard deviation of 4.2 g. At the 0.05 significance level, test the claim that the sample comes from a population with a me
Random variable N has a Poisson(?) distribution and Y |N = n has a Binomial (n, 1/2) distribution. Find the moment generating function for Y , E[etY ]
What is the best point estimate of the population mean net change in LDL cholesterol after the garlic treatment? Please show all work how you got the answer.
A clinical trial tests a methods designed to increase the probability of conceiving a girl. In the study 540 babies were born, 297 of them were girls. Use the sample data to construct a 99% confiden
Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).
A random sample of 16 students from the student body of a large university had an average age of 25 years and a sample standard deviation of 2 years. Test at a 5% level of significance to see if the
A manufacturer produces two types of computer monitors: monochrome and color. Past sales experience shows that at least twice as many monochrome monitors are sold as color monitors.
How many different samples of two baskets each are there? List all possible samples of size two and compute the mean of each sample. Calculate the population mean and compare it to the mean of the sam
A precision instrument is guaranteed to read accurately to within 2 units. A sample of four instrument readings on the same object yielded the measurements 353, 351, 351, 355.
A project was planned using PERT with three times estimates. The expected completion time of the project was determined to br 40 weeks. The variance of the critical path is 9.
Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 4 IQ points of the true mean. Assume t
Consider a regression situation in which y = hardness of molded plastic and x = amount of time elapsed since termination of the molding process. Summary quantities included the following.
In order to determine any difference between the average daily sales of two branches of a department store, the data below has been gathered. At a 5% level of significance, test to determine if ther
In order to estimate the difference in the yearly incomes of marketing managers in the East and West of the United States, the information below was gathered. Compute and explain a 95% confidence in
The ground-to-air missle battalion needs people with a score of 7 or higher on the exam. What is the probability that a new recruit will meet that criteria?
Here are the golf scores of 12 members of a college women's golf team in two rounds of tournament play. (A golf score is the number of strokes required to complete the course, so that low scores are
Assume that if the placebo is ineffective, the probability of a patients condition improving is 0.48. For the hypotheses that the proportion who improve is 0.48 against that it is greater than 0.48,