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A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 925 hours. A random sample of 39 light bulbs has a mean life of 905 hours with a standard deviation o 55 hours. Do you have enough evidence to reject the manufacturer's claim? Use a=0.03
a) Identify the null hypothesis and alternate hypothesis.
b) Identify the critical values.Zo =
c) Identify the standardized test statistic.Z =
d) Decide whether to reject or fail to reject the null hypothesis.
Find out the best predicted household size given that the household discards 5.00 lb of plastic.
"You are running a chi-squared test. If you have 5 groups with 3 characteristics each, what would your critical value be with an alpha of .25? a . Between 0 and 3.0
What is the 95 percent interval for the population mean?
The technician has just made an attempt to calibrate the machine. a. What is the probability that the machine is in adjustment?
Assume it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $25 and standard deviation $8.
The port of Trop can service only 1 ship at a time. However, there is mooring space for 3 more ships. Trop is a favorite port of call, but, if no mooring space is available the ships have to go to the next port.
The probability is 90% that the sample percentage is contained within what symmetrical limits of the population percentage?
In as sample of 855 bartenders, 48% report hearing complaints from patrons about their jobs. If the maximum error of estimate for the proportion of bartenders hearing job complaints is 4.4 percentage points, what is the degree of confidence used?
Initially the wheel rotates with an angular speed W, causing the block to rise with a linear speed v = 0.33 m/s. Find the moment of inertia of the wheel if the block rises to a height of = 7.9 before momentarily coming to rest.
A person runs one mile to his house as fast as he can. It is equally likely that he will run at an average speed of 3 miles per hour, 6 miles per hour, and 9 miles per hour.
The superintendent of a printing plant has selected a random sample of 100 rolls of paper from a large shipment. The average length of the sample rolls is 416 feet, with a variance of 2704 feet.
Use Gauss-Jordan method to determine solution to following system of equations?
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