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At the .01 level of significance, do these data support the conclusion that the ferritin distribution in elderly men has a smaller variance than in younger men?
Carry out a significance test for the hypothesis that the two tests have the same population mean. Give the P-value and state your conclusions.
Let X denote the proportion of allotted time that a randomly selected student spends working on a particular aptitude test, and suppose the probability density fuction, p(x) of X is: {f(x)= (theta +
Suppose the Acme Drug Company develops a new drug, designed to prevent colds. The company states that the drug is equally effective for men and women. To test this claim, they choose a simple random
Given that the exam has a mean of 1000 and a standard deviation of 200, what is the lowest possible score a student needs to qualify for acceptance into the JB University?
A population consists of 500 elements. We want to draw a simple random sample of 50 elements from this population. On this first selection, the probability of an element being selected is?
The manufacturing of a ball bearing is normally distributed with a mean diameter of 22 millimeters and a standard deviation of .016 millimeters. To be acceptable the diameter needs to be between 21
our confidence in that interval is 95%.". They tested a random sample of 40 batteries using a special device designed to imitate real-world use and recorded data on battery lifetim
A consumer group who surveyed a large number of air travelers found that only 145 out of 165 people who lost luggage on that airline were reunited with the missing items by the next day. Does this c
A survey of 30 adults found that the mean age of a person's primary vehicle is 5.6 years. Assuming the standard deviation of the populaiton is 0.8 year, find the 99% confidence interval estimate for
A medical school claims that more than 28% of its students plan to go into general practice. It is found that among a random sample of 130 of the school's students, 32% of them plan to go into gener
Faculty in the psychology department at the state university consume an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. What proportion of faculty c
The standard deviation for the costs of all doctors visits is $35.15, estimate with 95% confidence the average cost of a doctors visit for all the patients of this medical clinic.
Allen is an appliance salesman who works on commission. A random sample of 39 days showed that the sample standard deviation value of sales was s = $215. How many more days should be included in the
From a population known to have standard deviation of 1.4,a sample of 70 individuals is taken.the mean of this sample is found to be 6.2.find the standard error of mean.also establish an interval es
Heights of men on a baseball team have a bell-shaped distribution with a mean of 181 cm and a standard deviation of 5 cm.
how large a sample should be taken to estimate the proportion of accident claims covered by the company if we want to be 90% confident that the sample percentage is within (+/-) 3 % of the actual pe
A study was designed to compare two energy drink commercials. Each participant was shown the commercials in random order and asked to select the better one. Commercial A was selected by 45 out of 10
A supplier has 50 printers, of which 2 are defective. If a bank purchases 5 of these printers, what is the probability that one of the printers is defective?
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
Calculate a 93% confidence interval for the proportion of companies that beat their estimates. How would you interpret this interval.
A study is run to estimate the mean total cholesterol level in children 2 to 6 yrs of age. A sample of 9 particpants is selected and their total cholesterol levels are measured as followed: 185 225
Estimate the mean amount spent per customer for dinner at a Livonia restaurant with a 91% confidence interval. Interpret the meaning of this interval.
Many hospitals considering placing a new hire in an upper level management position if the person scores in the upper 6 percent of the distribution. What is the lowest score a college graduate must
What is the probability that a random sample of size 400 will have less than 49% of the people who balance their checkbooks at least once per month?