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A 99% confidence interval determine for a population mean was computed to be (31.1, 48.3). Determine the mean of the sample, which was used to determine the interval estimate (show all work).
Suppose that a sample is drawn and z(?/2) = 1.65 and ? = 25. Answer the following questions: If the Maximum Error of Estimate is 0.04 for this sample, what would be the sample size? Given that the sam
Assume that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Determine the probability that the mean aptitude test score for a random
The modulus of rupture (MOR) for a particular grade of pencil lead is known to have a standard deviation of 250 psi. Process standards call for a target value of 6500 psi for the true mean MOR. For
The full-time student body of college is composed of 50% males and 50% females. Does random sample of students (30 male, 20 female) from introductory chemistry course show sufficient evidence to rej
Develop the sampling distribution of sample means for samples of size 2 selected from this set. Develop the sampling distributions of sample ranges for samples of size 2.
The current data set that the researchers show you contains 5 patients who underwent the old procedure and 3 who underwent the new procedure. For each patient, the recovery time is noted in days.
Researchers want to find out if gender differences exist for students in elementary school. They draw two simple random samples of size 100 each, one of male students and one of female students from
The owner of restaurant that serves continental food wants to study characteristics of his customers. He decides to focus on two variables: the amount of money spent by customers and whether custome
Develop a 95% confidence interval estimate of the population proportion of recruiters who do interest research on candidates. Based on (a), is it correct to conclude that more than 70% of recruiters d
You and your friends have decided to go to The Kentucky Derby. There are 13 horses in the race. How many ways can the horses come in first, second, or third? Is this an example of a combination or a
What is the probability of selecting someone who is taken, given that they are blonde? What is the probability of selecting a single brunette?
In the last presidential election, before the candidates started their major campaigns, the percentages of registered voters who favored the various candidates were as follows:
Consider the following sample of annual income (in thousands of dollars) of 9 randomly selected residents of Maricopa County:
Basketball player Shaquille O'Neal makes a free throw shot about 53.1% of the time. Find the probability that:
A course in mathematical statistics is offered throughout each term of academic year at university. If 63, 82, 56 students are registered for this course throughout the fall, winter and spring quart
If an athlete uses steroids, probability that test will detect the steroids is 0.98. Pierre Vitesse, internationally known cyclist as well as competitor in the Toursist-De-France bicycle race, has t
The Employment and Training Administration reported that the US mean unemployment insurance benefit was $238 for each week. A researcher in the state of Virginia
A professional employee in the large corporation receives average of = 40.2 e-mails for each day. Most of these e-mails are from other employees in the company.
Let x be a random variable representing dividend yield of Australian bank stocks. We may assume that x has a normal distribution with = 2.6%.
Assume you've a population of 150 strings, 50 of which have zero length (corresponding to zero effort level), 50, short length (corresponding to low effort) level, and 50, long length (corresponding
The standard IQ test has a mean of 96 and a standard deviation of 14. We want to be 90% certain that we are within 4 IQ points of the true mean. Determine the required sample size.
In a survey, 22% of 210 single women said that they "definitely want to have children." In the same survey, 28% of 255 men gave the same response. Construct a 95% confidence interval estimate of the
However, a particular county hospital feels that its percentages are different. To prove its claim, the hospital has randomly selected a sample of 300 patients who have visited its emergency room in
The traffic light at intersection of Katie Dr. and Danville Rd. turns red at regular intervals of time 3 min as well as stays red for 2 min. So the Probability of arriving at random and having to st