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A major credit card company is studying the habits of its credit card holders and would like to determine whether the average monthly balance of credit card holders has fallen in recent years to less than $750. A random sample of 100 accounts is taken and the sample average is $714 with a sample standard deviation of $236.5. Perform the appropriate hypothesis test to determine if the company can conclude that the average has fallen to less than 750. Use an alpha of .05.
question a race pilots average rate of speed over a 720-mi course is inversely proportional to the time in minutes t
In a sample of 18 belts, suppose x¯ = 1049. Should the assembly line be shut down? Justify your answer using the Z distribution and the appropriate.
Your employer needs to borrow $550,000 to finance inventory for the upcoming seasonal rush.
suppose that the random variable x represents the length of a punched part in centimeters. let y be the length of the
Find the margin of error and construct a 90?% confidence interval for the population mean µ. Interpret the results.
Find the mean and the median for each list of values:- 64, 68, 72, 76, 80, 86- 10, 6, 2, 7, 100- 30, 10, 40, 30
A random sample of 12 observations is selected from a normal population. The sample mean was 407 and the sample standard deviation 6.
a well-insulated turbine operating at steady state develops 10 mw of power for a steam flow rate of 20 kgs. the steam
Major motor failures occur among the buses of a large bus company at the rate of2 a day. Assuming that each motor failure requires the services
suppose there are two random variables x and y distributed uniformly over -2ltxlt2 and 0ltylt1. determine
What is the critical value for a claim about standard deviation o=2.3 if s= 2.1 and n= 115? use confidence level of 95%
suppose that the number of accidents at a nuclear power plant in one week has a poisson distribution with mean 3 and
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