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In a random sample of 1002, 701 said they voted in a recent presidential election.
(a) Find the best point estimate of the population proportion of people who said they voted.
(b) Construct a 99% confidence interval for the population proportion of people who said they voted. List the margin of error and critical value. Intrepret the confidence interval.
A CFR system with λ = 0.0004 has been operating for 1000 hr. What is the probability that it will fail in the next 100 hr? The next 1000 hr?
Which promises the profit of $24,000 with the probability of .7 or a loss (due to bad weather, strikes, and such) of $8000 with the probability of .3. Determine the expected profit?
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
A major department store chain is interested in estimating the average amount its credit card customers spent on their first visit to the chain's new store in the mall.
Set up dummy coded dummy variables to contrast each of the other groups to Group 2, medium Anxiety; run a regression to predict exam performance (Y) from these dummy coded dummy variables.
are you annoyed with spam e-mail? suppose a random sample of 200 penn state students was asked this question of which
A monthly budget of $100,000 is available for both advertising and purchase of the fragrances. Develop and solve a linear optimization model to determine how much of each type of perfume should be produced to maximize the net profit.
how does variablity in a population influence standard error of the mean? if you were studying the effect of puppies on
The Kirschner Company has a contract to produce garden hoses for a customer. Kirschner has 5 different machines that can produce this kind of hose. Write the constraint that indicates they have to use at least three of the five machines in their p..
Write a correct null and alternative hypothesis for testing the claim that the mean life of a battery for a cell phone is at least 115 hours.
If random samples, each with n = 4 scores, are selected from a normal population with MK = 80 and o=10
If a group is chosen from a population on the basis of sharing the same percentages of trait features as known to exist in the population, then the group so chosen would constitute:
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