A lab supply company sells pieces of Douglas fir 4 inches long and 1.5 inches square for force experiments in science classes. From experience, the strength of these pieces of wood follows a Normal distribution with standard deviation 2000 pounds. You want to estimate the mean load needed to pull apart these pieces of wood to within 500 pounds with 90% confidence. How large a sample is needed?

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Q: The following frequency distribution shows the number of crimes committed in a sample of 100 urban n...

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Q: n=20, a =0.01 -"/2,n – 1

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Q: In a normal distribution with a mean of 72 and a standard deviation of 12 what percentage of observa...

A: Given that , mean = μ = 72 standard deviation = σ =12

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A: Givena 95% confidence interval for the meantime it takes for driver to apply the brakes after seeing...

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Q: < 400ml 2 400ml total Low sugar available No low sugar 45 35 80 15 105 120 Total 60 140 200

A: We use the given contingency table to find the required probability. 

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A: Given : Degree of freedom, df = 30

Q: Given the confidence interval (22.5, 67.3), what is the margin of error? 44.9 a 11.2 22.4 d 44.8

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Q: Consider the following distribution : 0-10 10-20 20-30 30-40 40-50 : 12 18 20 25 23 f Compute mean, ...

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Q: A researcher studying reaction time of drivers states that A 95% confidence interval for the m time ...

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A: Question:

Q: The following frequency distribution shows the number of crimes committed in a sample of 100 urban n...

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Q: Suppose a jar contains 19 red marbles and 10 blue marbles. If you reach in the jar and pull out 2 ma...

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Q: Example 42. The mean and standard deviation of 20 items was found Later, it was found that item 12 w...

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Q: What is the mean number of heart failure patients with the condition due to natural causes that ente...

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Q: Calculate the correct mean and standard deviation.

A: Here use standard deviation and mean formula 

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A: GivenMean(μ)=38.72standard deviation(σ)=3.17

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Q: 8) Jasmine has homework assignments in seven subjects. She only has time to do four of them. 10) You...

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Q: Here are measurements (in millimeters) of a critical dimension on an SRS of 8 of the more than 200 a...

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Q: Let X be a discrete random variable and let Mx(t) be its moment-generating function. Rx(t) = In(Mx(t...

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Q: Please answer carefully, best picture I can take.

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