Observations from a population with a standard deviation
A random sample of 50 observations from a population with a standard deviation of 25 and computed the sample mean to be 100. Estimate the population mean of:
a) 90% confidence
b) 95% confidence
c) 99%confidence
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The Census bureau has estimated that the average salary of the college-educated male is $75,000. The standard deviation of their measurements of salaries is $2,000. They also assume that salaries are normally distributed, for convenience of their
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A new process for producing synthetic diamonds can be operated at profitable level only if average weight of diamonds produced by the process is greater than 0.5 karat. To measure the profitability of process, a sample of six diamonds was generate
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The scores on the university examination are Normally distributed with a mean of 62 and a standard deviation of 11. If the bottom 5% of students will fail the course, what is the lowest mark that a student can have and still be awarded a passing g
A research team conducted a critical study and using data they gathered in their random experiment a 95% confidence interval for the population mean was constructed.
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