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Question: A random sample of size 256 is drawn from a population whose distribution, mean, and standard deviation are all unknown. The summary statistics are x¯ = 1011 and s = 34.
a. Construct a 90% confidence interval for the population mean μ.
b. Construct a 99% confidence interval for the population mean μ.
c. Comment on why one interval is longer than the other.
in 1997 frequent flyer magazine reported that 71 of frequent fliers surveyed complained that they had difficulty
"The Whites Invade Harlem," is his recollection of certain aspects of life in Harlem during this era.
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
An unknown distribution has a mean of 45 and a standard deviation of eight. A sample size of 50 is drawn randomly from the population.
a. Compute and interpret the simple price index for net revenue, using 2006 as the base year.
A reasearcher is running a chi-sq test. She would like to test her hypothesis at the alpha=.05 and finds that her research situation has 5 degrees of freedom. What is value for the chi-sq critical?
The number of rushing yards in Game 16 is an outlier in the x direction. What effect do you think this game has on the correlation?
The number of runs scored per game by a particular major league baseball team isa discrete random variable with mean 3.9 runs and standard deviation 1.3 runs. What is the probability that the team averages more than 4 runs per game
It is known that the ?rst box contains 26 operable and 4 nonoperable components and that the second box contains 28 operable and 2 nonoperable components. Assume that the probability of making a selection from each of the boxes is the same.
A supplier shipped a lot of six parts to a company. The lot contained three defective parts. Suppose the customer decided to randomly select two parts.
Suppose that Rules 1 and 2 are used simultaneously for the detection of out-of control conditions. Assuming independence of the rules, what is the overall probability of a type I error? Explain the meaning of a type I error in this context.
If the population standard deviation is 18.8 days, find the 90% confidence interval for the average number of days worked by all employees who are paid through payroll departments.
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