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The length of the skulls of 10 fossils skeletons of an extint species of bird has a mean of 5.68cm and a standard deviation of 10.29cm. Assuming that such measuements are normally distributed. Construct a 95% confidence interval for the true variance of the skull length of the given species of bird.
Kannon Camera has developed a new camera that it claims can take an average of more than 10 photographs per second. You decide to evaluate the company's claim. In summary, in this problem you are given:
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%.
Sketch the appropriate distribution, and locate the critical region for a = 0.05.
Consider a random sample of six families who are asked if their children have an influence on their vacation destination.
Examine the plot of the regression residuals against t. Is there a tendency for the residuals to have long positive and negative runs? To what do you attribute this phenomenon?
Discuss why the 90% and 99% confidence intervals are different. What would you expect to happen to the confidence interval in part A if the sample size was increased?
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.
Is the distance beyond or before the double lines where a car stops at an intersection affected by the age of the driver (young, middle age, older) and/or whether or not there are any passengers?
Normally distributed with a mean of 52 and a standard deviation of 3. What is the probability that the MPG for a selected mid-size car would be greater than or equal to 50.
suppose that a group of 1000 orange trees is laid out in 50 rows of 20 trees each. to determine the sugar content of
A coin is flipped e times and heads (h) or tails (t) are recorded:
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
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