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recall that the trash bag nayfacturer as concluded that its new 30-gallon bag will be the strongest such bag on the market if its mean breaking strength is at least 50 pounds. In order to provide statistical evidence tat the mean breaking strength of the new bag is at least 50 pounds, the manufacturer randomly selects a sample of n bags and calculates the mean x of the breaking strengths of these bags. If the sample mean so obtaine is at least 50 pounds, this provides some evidence that the mean breaking strength of all new bags is at least 50 pounds. suppose that (unknown to the manufacturer) the breaking strengths of te new 30-gallon bag are normally distributed with a mean of 50.6 pounds and a standard deviation of 1.62 pounds
a. find an interval containing 95.44 percent of all possible sample means if the sample size employed is n=5
b. find an interval containing 95.44 percent of all possible sample means if the sample size employed is n=40
c. if the trash ag manufacturer hopes to obtain a sample mean that is at least 50 pounds which sample size n=5 or n=40 would be best.
Consider the following estimated regression equation, based on 10 observations.
A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3.5 ounces.
Assume that 6 customers enter store and that these customers make independent purchase decisions. Use binomial formula to compute probability that exactly five customers make purchase.
A City Survey states that 70 percent of all business owners favor increasing the parking fees. The city has commissioned a random sample of n = 100 business owners.
With more then a million teachers set to retire we are seeing a record number of turnovers in the teaching profession.
Quality control studies for Leaky Jet Computer Printers show the lifetime of the printer follows a normal distribution with a mean of 4.5 years and a standard deviation of 0.85 years.
To find out the efficiency of the current ticket operation, Mike wishes to examine several queue operating features.
What type of probability distribution is presented? Find the probability that exactly 5 of his saplings will die in that first winter. Round to 4 decimal places. Find the probability that 5 or less of saplings will die in that first winter. Round to ..
Workers at a large toxic clean up project are concerned that their white blood cell counts may have been reduced. Let x be a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult.
You are the production manager of a company. Parachutes are woven in your factory using a synthetic fiber purchased from one of four different suppliers. The most important outcome for parachutes is strength of the fabric.
The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. What is the probability that 4 or more of the calculators will be defective?
The employees of a company were surveyed on questions regarding their educational background and marital status. Of the 600 employees
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