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Then identify what you think is the best measure of variability to use for your example and explain why you believe it to be better than the others.
the breaking strenght of a certain rope is known to have a mean of 2000 pounds and a variance of 2500 pounds. Let X be the mean of any sample of 100 ropes selected at random. find the expected value
Suppose that the teachers in the previous exercise each receive a 5% raise. the amount of the raise will vary from $1500 to $3000, depending on present salary. Will a 5% across-the-board raise incr
A study of the scores on an in plant course in management principles and the years of service of the employees enrolled in the course yielded the following statistics: Test Scores: mean=100 variance
The number of viewers of American Idol has a mean of 29 million with a standard deviation of 5 million. Assume this distribution follows a normal distribution.
Assume you are conducting a one-way analysis of variance using a 0.05 level of significance and have found that the p-value = 0.02. Which of the follow is correct regarding what you can conclude?
A major hurricane is a hurricane with wind speeds of 111 miles per hour or greater. During the 20th century, the mean number of major hurricanes to strike the U.S. mainland per year was about 0.7. F
two players A and B take turns in tossing (repeatedly) a biased coin having P(heads)=p, p ? (0,1). the first to get heads wins the game. Suppose A starts first. What is the probability that A wins?
In a random sample of 500 Southwest Airlines flights departing Phoenix Sky Harbor Airport in January 2008, 141 departed 15 minutes or more later than scheduled. At the .05 level of significance, is
What is the probability that a patient who takes the drug will experience relief of at least one of two symptoms?
A sample of 65 business people was randomly selected and given a leadership test, which measures motivation and "internal strength." The mean score on this test was 84.4, with a standard deviation o
cash back when they make a purchase at a shoe store. or C. an entry into a sweepstakes when they make a purchase. I need to determine the probability of each option.
Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. What is the p-value associated with your test of hypothesis?
59 percent of men consider themselves basketball fans. You randomly select 10 men and ask each if he considers himself a basketball fan. Find the probability that the number who consider themselves
Compute the probability that 8 or more women would be laid off at random. Based on your answer, do you think that management really laid off these people randomly? Explain.
A poll of 1100 randomly selected students in grades 6 through 8 was conducted and found that 47% enjoy playing sports. Would confidence in the results increase if the sample size were 3600 instead
Assume that x has a normal distribution, with the specified mean and standard deviation.
Democrats and 70% of the Republicans favor the bill. The bill needs a simple majority to pass. Using a probability tree, determine the probability that the bill will pass.
The distribution of dates was more or less mound-shaped and symmetrical about the mean. Use the empirical rule to estimate a range of years centered about the mean in which about 99.7% of the data (
The marketing department has been given the assignment of designing color codes for the 44 different lines of compact disks sold by Goody Records.
Generate a 95% CI for the difference in proportions of participants reporting a reduction of symptoms between the experimental and the placebo groups?
Assuming that the heights of college women are normally distributed with mean 68 inches and standard deviation 2.5 inches, what percentage of women are shorter than 63 inches?
Find the probability that you will find 2 or more artifacts in the 30 liters of sediment. Round your answer to the nearest ten thousandth.
Generate a 95% confidence interval for the difference in proportions of patients with hypertension between groups.
The SAT scores of entering freshmen at a certain university have a mean of 1200 and a standard deviation of 90. A random sample of 100 freshmen is taken and , the sample mean of their SAT scores, is