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A machine for making nuts is known to create nuts with a standard deviation in size of 0.20mm. A tradesman is required to adjust the machine to make 49mm nuts. Unfortunately the machines scale is missing and the tradesman has to adjust it by trial and error. How many nuts does he have to make and test after an adjustment before he can be certain at the 95% level of significance that the machine is calibrated to within 0.04mm of the correct size?
The standard deviation of the time to complete the entire homework assignment
A marketing survey is conducting in which students are to taste two different brands of soft drink. Their task is to currently identify the brand tasted.
Airplane Safety: Suppose that 62% of all adults think that airplanes would be safer places if pilots carried guns. An opinion poll plans to ask an SRS of 1009 adults about airplane safety.
Find the probability that an eligible voter selected at random will have the following characteristics.
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
An investigator wants to design a study to estimate the difference in the proportions of men and women who develop early onset cardiovascular disease
It is the gallons of water processed at a plant, and the amount of lead removed from the water. A. Make a scatterplot to determine what kind of relationship there seems to be between the two variables. Use the percent of lead removed as the respon..
Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. Quality control personnel inspect a random sample of the teams assemblies and judge
Choose the Hypothesis. Specify the Decision Rule. Calculate the Test Statistic. Make the Decision. Give an interpretation of the Decision
A researcher is comparing two antihypertensive drugs A and B with regards to reduction of patient's systolic blood pressure (SBP). Baseline SBP is measured for two groups of patients.
If Chebychev Inequality gives the lower bound for probability. For the present problem the lower bound for the probability is 0.75 and actual probability is 0.87.
You are given the choice of three doors. Behind one is a new car and the others hide a barnyard animal for you to keep. After you choose door number one, your host (Monty) opens door three to reveal a goat.
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