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Assume further that this sum may be considered to be the sum of an independent trials process with 100 experiments each having expected value of 10 pounds and standard deviation 1. Find the approxim
What is the critical value for a two-tailed F -test with alpha=0.10 , when the sample size from which the c was 10, and the sample size from which the denominator was obtained was 24?
The number of times a batter gets to bat in a game follows a binomial distribution N~BIN(6, 0.8). Given the number of times at bat, n, that the batter has, the number of hits he gets conditionally f
Two t-shirt printing factories produce t-shirts for a local sports team. Factory A produces 60% of the shirts and factory B produces 40%. Five percent of the shirts from Factory A are defective, and
Assume that in a hypothesis test with null hypothesis Ho:u = 12.0 at alpha= 0.05, that a value of 10.0 for the sample mean results in the null hypothesis to be not rejected. That corresponds to a co
A college believes that 24% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried
It was found that in a sample of 90 teenage boys, 70% of them have received speeding tickets. What is the 90% confidence interval of the true proportion of teenage boys who have received speeding ti
A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 18. If he were to conduct a second study to reduce the maximum error of esti
A random sample of 70 voters found that 40% were going to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
A random sample of 30 students results in a sample mean age of 20 years with a sample standard deviation of 1.5 years. Assume age is normally distributed. To test the hypothesis H0: ? = 21, we would
Suppose the claimed drying time is true, that is ? = 45 minutes, what is the probability of observing a sample mean of x = 52 or greater from a sample size of 25? (Round your answer to four decimal
The resulting "life" data from the batteries had a mean of 22.5 hours. Assume these values have a normal distribution with a standard deviation of 1.58 hours.
A random sample of 70 needles was taken from a medical manufacturing facility and 24 were found to be defective. Calculate a 99% confidence interval for the true proportion of defective needles.
The wall thickness of 20 glass 2-liter bottles was measured by a quality control engineer. The sample mean was Xbar=4.05 millimeters, and the sample standard deviation S=0.08 millimeters. Computer a
The standard deviation of the lifetime of a sample of 15 electric light bulbs was computed to be 98 hours and the lifetime duration follows a normal distribution. Find a 95% CI for the standard devi
A random sample has been taken from a normal distribution and the following confidence intervals were constructed using the same data:
Determine the 99% confidence interval around the mean from the study. Dont need to know the sample size to solve?
Compute the least squares line. Give a 95% confidence interval for the slope.
Four types of solar energy collectors were collected. The data is in the accompanying file. Construct an ANOVA table. Can you conclude that the mean power differs for different collectors?
A sample of 15 measurements of the diameter of a shaft gave a mean Xbar=4.38 inches and a standard deviation s=0.06 inch. Find a 95% confidence interval for the population mean of the shafts
In measuring reaction time, a human factors engineer estimates that the standard deviation is 0.20 second. How large a sample of measurements must be taken in order to be 95% confidence that the err
Measurements of the diameter of a random sample of 100 ball bearings made by a certain machine during one week showed a mean of 0.944 inch and a standard deviation of 0.052 inch. Find a 90% Confiden
Taking samples of size n = 2, find the mean of the sample means and the standard deviation of the sample means. Explain the relationships between the different means and the different standard deviati
Determine the percentage of fruit flies that have thorax lengths 0.9 mm or longer? Determine the percentage of fruit flies that have thorax lengths between 0.9 mm and 1 mm?