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Give a 99% confidence interval for the proportion of all U.S. adults who attended church or synagogue during the week preceding the poll.
A television station estimates that 45% of college students watch the Super Bowl. For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch t
We have no idea Regarding the shape of the population distribution. What is the probability that the mean fee for a sample of 30 customers was less than $125?
Suppose that now we have the following ordered pairs: (1, 4), (2, 3), (3, 2). Calculate the correlation coefficient (r-value), and type in your answer rounded to 3 decimal places (if necessary).
Suppose a one tailed t test is being applied to find out if the population mean is less than $120. The level of significance selected is 0.01 and 26 bank accounts were sampled. The critical value is
When a large shipment of alternators is received at the plant, 100 are tested and if more than two are nonconforming, the shipment is returned to the alternator manufacturer. What is the probability
Transportation officials tell us that 80% of drivers wear seat belts while driving. What is the probability that between 538 and 546 drivers in a sample of 700 drivers wear seat belts?
As a part of the editorial a random sample of 260 households showed 170 own pets. Does this data disagree with the Pet Food Dealers Association data? Use a 0.05 level of significance.
Collect on its accounts receivable is 36 with a standard deviation of 11 days. What is the probability that a single AR account takes more than 30 days to collect?
A medicine company produces pills containing an active ingredient. the company is concerned about the mean weight of this ingredient per pill, but it also requires that the variance be no more than
Since Richard has not attended class recently, he doesn't know any of the answers. Assuming that Richard guesses on all ten questions, what is the probability he answers at least half correctly?
But the mean service time remains at 2 minutes. Does this make any difference in the model used and in the results? Explain.
Suppose that you wish to find P(-2 < x < 2) for a continuous uniform distribution having a minimum of -3 and a maximum of 3. If you incorrectly assume that the distribution is normal instead o
How can I determine the probability that a randomly selected player bats over 0.300? How can I determine the probability that a team of 25 players will have a mean above 0.275?
Past studies have revealed that only 85% of the booked passengers actually arrive for the flight. Find the probability that if the airline books 22 persons, not enough seats will be available.
The average IQ of 10 students in a Mathematics course is 114. If 9 of the students have IQs of 101, 125, 118, 128, 106, 115, 99, 118, and 109, what must be the IQs of the other student?
A standard deviation of 3 pounds. Find a 95% confidence interval for the population mean content weight of the bags of dog food.
What is probability that two randomly chosen numbers between 0 and 1 will have a sum less than or equal to 1 and a product no greater than 15/64?
Assume there are 18 homes in the Quail Creek area and 9 of them have a security system. Five homes are selected at random: what is the probability all five of the selected homes have a security syst
The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5725 in 1999 to 7977 in 2009. What is the geometric mean annual percent increas
What is the probability that half or more of the claims have been padded? Round your answer to the nearest thousandths place.
On the first day of class last semester, 10 sutdents were asked about the number of credit cards in their wallet. The resulting data were summarized in the following frequency table:FInd the varianc
Suppose a random sample of size 36 is drawn from a population with a mean of 278. If 86% of the time the sample mean is less than 280, what is the population standard deviation?
Obtain the transition probability matrix. Also determine the proportionate visits by him to each of the cities in the long run.
Has there been a significant shift upward in the percentage of persons who want to go to Europe? Using the .05 significance level for this study.