Power screw drivers
The tool shop has 8 power screw drivers and two have a short. A foreman takes 4 of screw drivers to his crew. That is the probability that fewer than two have a short?
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Assume the length of time students take in writing a standard entrance examination is normally distributed with mean 60 minutes, std. deviation 8 minutes
In a sample of 112 washers, 8 are "our of spec". Estimate the proportion of washers that are being prodiced tat are out of spec.
Throughout an 80 hour period, there are 7 unplanned work stoppages on production line. Determine the rate per hour at which stoppages occur.
Discuss the difference between mutually exclusive and independent events.
A group of n people of different heights are randomly ordered. Given that the very shortest person is first and the very tallest person is last, what is the probability the intermediate one are ordered by increasing height?
A venture capital company feels that rate of return (X) on proposed investment is approximately normally distributed with mean 30% and standard deviation 10%.
Conceptually, why does it make sense that the t critical values are always as large or larger than z critical values for the same level of confidence?
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