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Completion time (from start to finish) of a building remodeling project is normally distributed with a mean of 200 workdays and a standard deviation of 10 workdays. To be 99% sure that we will not b
In a 2 X 3 X 3 analysis of variance, the number of cells is?
You flip a coin 60 times. You get heads 45 times and tails 15 times. Calculate a 95% Confidence Interval for the true population value. Calculate a 95% Confidence Interval for the proportion of hea
Use a 0.05 significance level to test the claim that the mean tar content of filtered 100mm cigarettes is less than 21.1mg, which is the mean for unfiltered king size cigarettes. What do the results
Assume that a simple random sample has been selected from a normally distribution population and test the given claim. Identify the null and alternative hypotheses, test statistic, p-value, critica
In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. T
Suppose a researcher gathered survey data from 19 employees and asked the employees to rate their job satisfaction on a scale from 0 to 100 (with 100 being perfectly satisfied). Suppose the followin
The statistical procedure ensures that the alpha level for any given planned contrast will not exceed .05 is
Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join this branch of the military because they are too short or too tall?
Assume the reading on thermometers are normally distributed with a mean of 0 Celsius and a standard deviation of 1.00 Celsius. Find the probability that a randomly selected thermometer reads between
A study found that the average time it took a person to find a new job was 3.5 months. If a sample of 30 job seekers was surveyed, find the 90% confidence interval of the mean. Assume the standard d
In an analysis of variance, if the null hypothesis is true, then: the research hypothesis can also be true.
A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 99% confident that her estimate is correct. If the standard deviation is $1050, how la
Find the probability that the return for common stocks will be greater than 16.32%. Find the probability that the return for common stocks will be greater than 5.89%.
A study of the influence of corrosion inhibitor on the failure of aluminum-wired twist-on connections, the data obtained with one sample of connectors wired with alloy aluminum and another sample wi
A survey found that Americans generate an average of 19.8 pounds of glass garbage each year. Assume the standard deviation of the distribution is 2.9 pounds. Find the probability that the mean of a
What is the total number of African American died from heart disease if they represent 13% of the 316,000,000 American population?
A company has 1,300 items. In a sample of 120 items, the historical cost of each item was compared with the audited value, and 10 items differed in their historical costs and audit values. Construct
A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 2 percentage points with 90% con
Construct a 95% confidence interval estimate of the total value of the merchandise in inventory at the end of the month.
A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 90% confident that the sample mean is correct to
The proportion of all children that drew the nickel too small is: 38/75. Assume that this proportion is true for ALL children (e.g. that this proportion applies to any group of children),
A plant purifies its liquid waste and discharges the water into a local river. The EPA collects water specimens of the discharge of the plant and also water specimens in the river upstream from the