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A machine is producing metal pieces that are cylindrical in shape. A sample of pieces is taken and the diameters are 1.01, 0.97, 1.03, 1.04, 0.99, 0.98, 0.99, 1.01, and 1.03 centimeters. Find a 99% confidence interval for the mean diameter of pieces from this machine, assuming an approximate normal distribution.
The prices recorded were $1.36, $1.37, $1.38, $1.39, and $1.40. What is the range, mean price, and the standard deviation of the gasoline?
Assuming the validity of this premise, among 25 randomly selected current customers, what is the probability that between 2 and 6 (inclusive) qualify for membership?
Bob gets tests grades of 86, 92, and 60 He gets an 90 on his final exam. Find the weighted mean if each tests counts for 20%, and the final exam counts for 40% of the final grade.
according to a website about salaries the national average salary as of october 2003 for a human resources clerk was
a client gives you a data set of 30 observed values that represent the number of gallons of gas that 30 individual
the traditional view about the normal curve in psychology is that normal curves area rare in nature but often occur in
Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level
Which statement is true for a statistical study?
the florida fruit supply company uses bottles that are labeled as containing 23 oz of orange juice. a random sample of
Ten students were sampled at random from a student population. Each was asked how many courses he or she was planning on studying in the upcoming year. The following is a list of the reported data values: 1, 2, 2, 3, 4, 5, 5, 5, 5, 6 What is the vari..
A normal population has an average of 80 and a standard deviation of 10. You select a sample of 25. Calculate the probability that the sample mean
the human resources department at a major high tech company recently conducted an employee satisfaction survey of 100
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