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1. Let X be normally distributed random variable with μ = 100 and σ = 10. Find the probability that X is between 75 and 100.
2. Let a random sample be taken of size n=36 from a population with known standard deviation of σ = 3. Suppose that the mean of the sample is x¯ = 37. The approximate 95% confidence interval for the mean, μ, of the population from which the sample was drawn. (Round the values to whole numbers for your confidence level.)
Assume the branch manager requested estimates of the mean selling price of Gulf View condominiums with a margin of error of $40,000 and the mean selling price of No Gulf View condominiums with a margin
State the Null and Alternative Hypotheses. Determine the test statistic. Determine and interpret the p-value
With a mean of $8.90 and a standard deviation of $5.70. She waites on 30 parties. What is the probability that she will earn at least $350?
Steven collected data from 20 college students on their emotional responses to classical music. Students listened to two 30-second segments from "The Collection from the Best of Classical Music."
Identical parts of which 10 are defective and 90 are non-defective. Three parts are selected without replacement. What is the probability that at least one part is defective?
How many treatments are there? What is the total sample size? Is there a significant difference at the 5% Level of significance? Would I accept or reject the null Hypothesis.
Researchers at a pharmaceutical company have found that the effective time duration of a safe dosage of a pain relief drug is normally distributed with mean 2 hours and standard deviation 0.3 hour.
The following is the number of minutes to commute from home to work for a group of automobile executives.
Sample of 81 business students over a one-week period. Assume the population standard deviation is 1.8 hours. with a ,95 probability, the margin of error is approximately.
The population standard deviation is σ2 = 7. Test that the population means differ using a 1% significance level.
There are 130 cabinets in a row in a warehouse. The first worker to arrive opens the door of every cabinet. The next employee visits every other door and closes it.
A Federal funding program is available to low income neighborhoods. To qualify for the funding a neighborhood must have a mean household income of less then $15,000 per year.
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