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Physical Sciences
St. Simons Island, Georgia, is a popular vacation destination. Attractions include a salt-marsh tour, a dolphin watch, a golf course, and the art and antiques trail. In a sample of high-tide observations (in feet) from June 2013, = 7.07, σ = 0.702, and n = 30. 36
a. Assuming normality, find a 99% confidence interval for the true variance in high-tide level.
b. Historical evidence suggests the variance in high tide is 0.50. Is there any evidence to suggest the variance in high tide has decreased? Justify your answer. Write a Solution Trail for this problem.
Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical conclusion about the null hypothesis and final conclusion that addresses the original claim.
There are two bags one of which contains 3 block and 4 white balls while other contains 4 black and 4 white balls A dies is cast if face 1 or 3 turns up a ball is taken from first bag and if any other face turns up, a ball is chosen from second bag. ..
Suppose the national average for all young adults is 3.7 hours, and the magazine wishes toclaim that their subscribers exercise more on average. State the relevant hypotheses to test this claim. Specifically define any symbols you use.
Convert the frequency distribution to a cumulative frequency distribution. Develop a cumulative frequency polygon. About 60 percent of the orders were filled in less than how many days?
An insurance representative wants to determine if the proportions of women and men who buy the different policy types are the same. The actual sales results for 50 women and 50 men are
A ratings service would like to know, within 5 percentage points and with 95% confidence, the percentage of these households who tune in to the first episode of a network miniseries. How many television households must be included in the sample?
With the data of Exercise 1, estimate the total amount spent on medical care for the disease using the Horvitz-Thompson estimator, and estimate its variance.
What is the probability that fewer than 35 of the 500 women will be less than 58 inches tall? - Find the mean and standard deviation of X.
That is, P(µ-σ ≤ X ≤ µ+σ) = .68 if X has a normal distribution. For non-normal distributions, is it safe to assume that this probability is again 0.68? Explain your answer.
a random sample of 81 students at a local university showed that they work an average of 60 hours per month with a
the amount of time that a custome spends waiting at an airport check-in counter is a random variable with mean 8.3
Assuming that they wish to test the claim at alpha = 0.025, determine the rejection and non rejection regions based on your hypotheses in a). State the critical value.
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