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You measure the weights of a random sample of twenty-five male runners. The sample mean is 60 kilograms (kg). Suppose that the mean weights of male runners follow a normal distribution with unknown mean mu and standard deviation of 5 kg (sigma). What is the 95% confidence interval for mu?
What is the probability that a random person has an IQ between 85 and 115? Find the 90th percentile of the IQ distribution.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
A simple random sample of 6 recent graduates revealed the following information about their weekly incomes. What is the expected value of the average weekly income of all the recent graduates?
A normal population has a mean of 80.0 and a standard deviation of 14.0. Compute the probability of a value between 75.0 and 90.0.
Descriptive statistics for each of the four variables along with a discussion of what the descriptive statistics tell us about the motion picture industry?
Computing the probability values using normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
The president of an agency specializing in public opinion surveys claims that approximately 70% of all people to whom the agency sends questionnaires responds by filling out an returning the questionnaire.
Explain the logic of what you have done to a person who is unfamiliar with the analysis of variance.
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion.
An entomologist writes an article in a scientific journal, which claims that fewer than 7 in ten thousand male fireflies are unable to produce light due to a genetic mutation. Use the parameter p, the true proportion of fireflies unable to produce..
Calculate the measures of central tendency, dispersion, skew for your data. Display your descriptive statistical data using graphic and tabular techniques. Frequency distribution, Histogram.
What is the probability a random sample of 90 test takers will provide a sample mean test score within 10 points of the population mean of 502 on the Critical Reading part of the test (to 4 decimals)?
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