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At a .05 level of significance, the Department of Transportation claims that there is no difference between the variation of federal highway money distributed to the northeastern states and the variation of federal money distributed to the central states. The standard deviation for 11 northeastern states is 0.81 and the standard deviation for 12 central states is 0.35. What is the test value?
Normally distributed with a mean of 113 grams and a standard deviation of 5.4 grams. Find the probability that if 7 bags are randomly selected, their mean weight exceeds 114 grams.
assume that 2 out of every 1000 people have a particular disease. a test has been developed to detect this disease.
you flip a coin 60 times. you get heads 45 times and tails 15 times. calculate a 95 confidence interval for the true
If member of sales force submits the entertainment expense (dinner cost for four) of $190, must this expense be considered unusually high. Calculate and interpret z- score for each of six entertainment expenses.
question according to a study several years ago the average bmw driver earns 82 600 per year. suppose a researcher
fine motor skills were measured in a sample of kindergarteners before and after 6 months of occupational therapy.
The mean of this sample belongs to a sampling distribution.
the increase or decrease in the price of a stock between the beginning and the end of a trading day is assumed to be a
montgomery peck and vining 2001 report on a study in which a rocket motor is formed by binding an igniter propellant
containers arrive at a stocking station on a conveyor at the rate of five per minute. container weight is 25 kg.
a drag racer has two parachutes a main and a backup that are designed to bring the vehicle to a stop after the end of
a pizza delivery service delivers to a campus dormitory. delivery times follow a normal distribution with mean 20
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