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Find the 90% confidence interval for the standard deviation for the time it takes an inspector to check a bus for safety if a sample of 27 buses has a standard deviation of 6.8 minutes. Assume the variable is normally distributed.
To find out the efficiency of the current ticket operation, Mike wishes to examine several queue operating features.
in order to accumulate enough money for a down payment on a house a couple deposits 415 per month into an account
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
a two-tailed test of hypothesis was conducted and 60 values were above the median. computed z 1.61. at the 0.05 level
a player tosses two coins. if two heads show he wins 4. if one head shows he wins 2 but if two tails show he must pay a
1 a simple random sample of 102 engineering students was taken from a population of 750 engineering majors. it was
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 42 days.
There is evidence to reject the claim that the rodent type and the success of finishing the maze are not related because the test value 3.841 > 2.773
The mean and median selling price of existing single-family homes sold in October 2005 were $216,200 and $265,000. Which of the following most accurately explains which is the mean and which is the median and why?
to evaluate a particular metlar scale an item whose weight is known to be 16.01 ounces is weighted five times by the
the labor bureau wants to estimate at a 98 confidence level the proportion of all households that receive welfare. the
To cross a single lane of moving traffic, we require at least a duration d. Successive car interarrival times are independently and identically distributed with probability density function fT (t).
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