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A resercher wishes to estimate, with 90% confidence, the proportion of adults who have high-speed internet access. Her estimate must be accurate within 4% of the true proportion.
A randomly selected value from a normal distribution is found to be 2.1 standard deviations above its mean. What is the probability that a randomly selected value from the distribution will be great
A distribution center receives shipments of a product from three different factories in the quantities of 60,40, and 20. Three times a product is selected at random, each time without replacement. F
Determine the minimum sample size required to construct a 99% confidence interval using a population standard deviation of 0.25 in. Repart a using a standard deviation of 0.30 in. Which standard dev
Change the sample size to n=80. Construct a 90% confidence interval for the population mean repai cost. Which confidence interval is wider. Explain
Edward's hometown, Forks, Washington is usually very cloudy and rainy, but lately it has been very sunny with an 80% chance that it will be sunny each day for the foreseeable future. Assume that the
An American roulette wheel has 38 slots: 18 are red, 18 are black and 2 are green. Let R be the number of spins until you observe red. Let B be the number of spins until you observe black. Let G be
A shipment of 250 netbooks contains 3 defective units. Determine how many ways a vending company can buy three of these units and receive:
You are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers, 35 daisies and 42 lilies. Your mother likes daisies the best and you want to have 15 of those in
A particular competitor hits the target 90% of the time while lying down if it is not windy, but only 80 % of the time if it is windy. It is windy 40 % of the time. What is the probability that it w
Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Find the probability that a randomly selected adult has a
The wolf pack needs to kill 3 large animals in order to feed the whole pack. What is the probability that it will need to chase 20 large animals to feed the pack?
James teaches a class of 300 students, and only 6 have done their homework assignment which is due today. He calls on a student at random to put a problem on the board and check to see whether he or
Determine if the following data set is a Population or a sample: the average electric bill for the 50 United States and the District of Columbia?
Create a 95% confidence interval for the percentage of all American adults who favor the death penalty. Show what the error for the confidence interval is also.
How many would you have to survey in order to be at least 95% sure that you find at least 1 who is colorblind? What is the expected value and variance of X?
How many spins should you expect it to take to observe 4 blacks? What is the variance of the number of spins that it takes to observe 4 blacks?
Edward and his friends cannot go outside when it is sunny because they are vampires. Edward's hometown, Forks, Washington is usually very cloudy and rainy, but lately it has been very sunny with an
For your study on the food consumption habits of teenage males, you randomly select 10 teenage males and ask each how many 12-ounce servings of soda he drinks each day.
Consider a random sample of size n from a Bernoulli distribution, Xi ~ BIN(1,p). For a uniform prior density, p ~ UNIF(0,1), and squared error loss, find the following:
Consider a random sample of size n from a Poisson distribution, Xi ~ POI(m).
Consider the following. (Give your answers correct to two decimal places.) (a) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3982.
Specimens of blood from 10 different animals were analyzed for blood count, say, Y (in units of 100) and packed cell volume count X (in mm^3) with results as given below. Assuming normality, test th