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A study of 35 brown gerbils showed that their average weight was 4.7 ounces. The standard deviation of the population is 0.7 ounces. Which of the following is the 99% confidence interval for the mea
A machine is shut down for repairs if a random sample of 100 items selected from the daily output of the machine reveals at leas 15 percent defectives.
Resistors to be used in a circuit have average resistance 200 ohms and standard deviation 10 ohms. Suppose 25 of these resistors are randomly selected to be used in a circuit. What is the probabilit
The fracture strength of tempered glass averages 14 (measured in thousands of pounds per square inch) and has standard deviation 2. What is the probability that the average fracture strength of 100
On the basis of this information, make an inference about customer reaction to the new policy. (Round your answers to 2 decimal places. Omit the "%" sign in your response.)
The National Basketball Associaton had 39 black top executives (presidents or vice presidents) among its 388senior managers. Meanwhile Major League Baseball had only 11 blacks among its 307 top adm
What happens to the standard deviation of the distribution of sample means (DSM) as the sample size increases? Does the standard deviation of the DSM also increase? Why or why not? Explain.
An initial work sampling survey to estimate the percentage of time that MRI equipment is idle between 8:00 A.M. and 8:00 P.M., found that the MRI was idle in 9 of the 120 observations.
Consider a society concerned about crime. A measure of success could be the number of crimes of various types that occur in a given year. What else should we measure?
Compute the value of the appropriate test statistic.
This exercise illustrates that poor quality can affect schedules and costs. A manufacturing process has 100 customer orders to fill. Each order requires one component part that is purchased from a s
Suppose the unemployment rate in one country exceeds the rate in another country. Explain why the country with the lower rate can have, from the perspective of the other country, a higher unemployme
A coin with a probability p of heads is tossed independently n times. Let Xi=1 if the ith toss results in a head, and let Xi = 0 if the ith toss is a tail. What is E(X1X2X3.......Xn)?
Suppose the average number of lions seen on a day one tour in a safari park is 5, what is the probability that on a particular day tourist will see frwer than 4 lions?
Airlines use a measure of meeting the schedule when they focus on-time departure. Suppose they record whether the event "left the gate within 5 minutes of schedule" to reflect that they met the sche
All the major stock market indexes posted heavy losses in 2008. The mean one-year return for stocks in the S&P 500, a group of very large companies, was -38.5%.
Distribution of systolic and diastolic blood pressure for female diabetes between the ages of 30 and 34 have unknown means. The standard deviation are s=11.8mm Hg and d= 9.1mm Hg respectively [8].
A die is rolled and the square of the number of dots is recorded as the random variable X (for example, a roll of 3 results in X=9). Find the expected value and standard deviation of the random vari
Suppose an experiment consists of tossing a fair coin until a three heads occur. What is the probability that the experiment ends after exactly six flips of the coin with a head on the fifth toss as
Calculate the probability of observing a sample proportion of voters 0.55 or higher supporting the incumbent governor
A test consists of 10 true/false questions. To pass the test a student must answer at least 7 questions correctly. If a student guesses on each question, what is the probability that the student wil
Suppose that Y is a binomial random variable based on n trials and success probability p. Use the conjugate beta prior with parameters a and b to derive the posterior distribution of p|y.
Estimate the percentage of Germans who are at least 30 years old, but not yet 40 years old. It may help to construct a histogram of the data.
At the 0.05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportions of students who were absent due to contracting the flu at the schools?