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What is the weighted mean price per share? (Round your answer to 2 decimal places. Omit the "tiny_mce_markerquot; sign in your response.)
Compute the row percentages and identify the percent frequency distributions of in-come for households in which the head is a high school graduate and in which the headholds a bachelor's degree? fro
An electrical engineer has two boxes containing different types of resistors. the first box contains 3 resistors of one type and the second box contains 2 resistors of another type.
The owners of a two-person business make their decisions independently of each other and then compare their decisions. If they agree, the decision is made; if they do not agree, then further conside
With 90% confidence levels, determine wheter the two samples are statistically the same or different. Find the range for the true(or population) mean for each set with 90% confidence levels.
Consider a population having a standard deviation equal to 9.90. We wish to estimate the mean of this population. How large a random sample is needed to construct a 95 percent confidence interval for
A consumer testing agency obtains 4 cars randomly from each of the folliwng three makers: 1, 2, 3. We wish to compare gasoline efficincy of the cars produced by the three makers. Suppose the mean me
A new drug is claimed to have effect on reducing heart rate for patients with unstable angina by 15 beats per minute over 24 hours. Suppose heart rate(beat per minute) of population follows a normal
1. Students take an average of 45 minutes and standard deviation of 8 minutes to complete a certain statistics test. If a student is selected at random, what is the probability that the student take
Estimate the mean and standard deviation of the time-to-failure for Network A, the time-to-failure for Network B.
Suppose probability samples of size n=2 are selected from {1, 2, 3, 4} with probabilities d1=.4, d2=.4, d3=.1, and d4=.1. Demonstrate that tau_hat is still an unbiased estimator
If a drinking water supply contains a sodium concentration of 0.050% Sodium by mass, how many liters of this water must be consumed to exceed the FDA recommendation of Sodium? Assume that the densit
What is the Probability that the selected screw came from Lot 1? What is the Probability that the selected screw was defective? If the screw was defective what is the probability that it came from Lot
In a certain very large city, the Department of Transportation (D.O.T.) has organized a complex system of bus transportation. In an advertising campaign, citizens are encouraged to use the new "GO-D
Suppose that 1% of a large population carries antibodies to HIV in its blood. Draw a tree diagram with this information and use it to answer the following question.
Find x1 such that P(X>x1) = 0.6. Consider an interval for X, (a<X<b). Calculate a and b such that the interval is shortest and P(a<X<b) = 0.3
Using Minitab, generate a set of n observations from a binomial distribution with 1 trial and an event probability of 0.002, where n is your answer from
If the test says that pollutants are not present in a particular sample, what is the probability that is fact there are pollutant in the sample in question?
let X be random variable with the following probability distribution
Estimate the mean and standard deviation of the time-to-failure for Network A, the time-to-failure for Network B, and the difference between the time-to-failure for the two networks. Can you be at
P(X > 1.2)(Give decimal answer to two places past decimal.) Find the median time the book is checked out. (Give decimal answer to two places past the decimal.)
You are considering four independent variables for inclusion in a regression model. You select a sample of 30 observations, with the follwings results:
Suppose probability samples of size n=2 are selected from {1, 2, 3, 4} with probabilities d1=.4, d2=.4, d3=.1, and d4=.1. Demonstrate that tau_hat is still an unbiased estimator of the population t
You are asked to determine whether or not brunette students have a higher IQ score than other students. To do so, you administer an IQ test to a random sample of 300 brunette students. It is known t
Each of four persons, named 1, 2, 3, 4 fires one shot at a target. Let Ak denote the event that person k hits the target, where k = 1, 2, 3, 4. Assume A1, A2, A3, A4 are independent events. If P(A1)