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A sample of size 30 has sample mean 20.4 and sample standard deviation 2.1. What is the lower end point for a 95% confidence interval for the population mean based on this data? Give your answer to
Which one of the following statements is correct regarding the width of a confidence interval?
Assume MBA graduates have incomes normally distributed with a mean of $100,000 and a standard deviation of $20,000. Law school graduates also have normally distributed incomes, with a mean of $90,00
An investigator wants to test if there is a difference in endotoxin levels in children who are exposed to endotoxin (what type of variable is this?) as a function of their proximity to operating far
A new analytical method to detect pollutants in water is being tested. This new method of chemical analysis is important because, if adopted, it could be used to detect three different contaminates
In a test of the hypothesis H0: u -=60 versus H: u =60, a sample of n = 50 observations possessed mean x = 60.6 and standard deviation s= 2.5. Find the p-value for this test.
If on average 10% passengers who have booked fail to turn up for their flights, what is the aveage probability that at least one passenger who has a booking will end up without a seat on particular
A discrete random variable has moment generating function mx(t) = e^(2(e^t-1)).
Hand-calculate the sample size that will be required to detect an increase or decrease of 1.5(sigma) from the mean of one population at alpha = 0.05 and beta = 0.05 for a hypothesis test.
Hand-calculate the sample size that will be required to detect an increase or decrease of 1.5(sigma) from the mean of one population at alpha = 0.05 and beta = 0.05 for a hypothesis test. (Note: The
Does the confidence interval from part (a) gives limits in which we expect 95% of the sample data to lie? why or why not. Does the confidence interval from part (a) gives limits in wich we expect 95%
Find E(x) where X is the outcome when one rolls a six-sided balanced die.Find the mgf of X. Also, using the mgf of X, compute the variance of X.
A crate of mass 45.0 kg is being transported on the flatbed of a pickup truck. The coefficient of static friction between the crate and the truck's flatbed is 0.300, and the coefficient of kinetic f
A tube of Listerine Tartar Control toothpaste contains 4.2 ounces. As people use the toothpaste, the amount remaining in any tube is random. Assume the amount of toothpaste remaining in the tube fo
Objects with masses m1 = 12.0 kg and m2 = 8.0 kg are connected by a light string that passes over a frictionless pulley as in the figure below. If, when the system starts from rest, m2 falls 1.00 m
The coefficient of static friction between the m = 2.95-kg crate and the 35.0° incline of the figure below is 0.330. What minimum force vector F must be applied to the crate perpendicular to the
A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 126 N at an angle of 27.0° above the horizontal. The box has
A 3.00-kg block starts from rest at the top of a 33.0° incline and slides 2.00 m down the incline in 1.50 s. Find the acceleration of the block.
Find the mean and the standard deviation for the number of househ10. Refer to Question 9. If in a sample of 8 houses selected at random only 3 houses had cable TV, can it be considered an unusually
A paper studied various aspects of bus service and presented data on travel times from several different routes. The accompanying frequency distribution is for bus travel times from origin to destin
In a certain noisy factory, workers are provided with earplugs and are expected to wear them. An industrial hygienist inspecting the plant found that 100 of the 500 workers in the factory were not w
Find the standard deviation of the distribution in the following situations. (a) MENSA is an organization whose members have IQs in the top 2% of the population. IQs are normally distributed with me
Damien is 68 inches tall. Use the equation of the regression-line exactly as given in the first question to predict the height of his sister Tonya. Give your answer to two decimal places.
What was the cumulative incidence rate of hearing loss in workers who did not wear earplugs? What was the relative risk of hearing loss in workers who did not wear earplugs, compared with those who di