Chapter 8: Q 11. (page 507)
More prayer in school Refer to Exercise . Interpret the confidence level.
All samples to have confidence interval have population parameter.
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Willows in Yellowstone Writers in some fields summarize data by giving x ฬ and its
standard error rather than .Biologists studying willow plants in Yellowstone National Park reported their results in a table with columns labeled The table entry for the heights of willow plants (in centimeters) in one region of the park was . The researchers measured a total of plants.
a. Find the sample standard deviation for these measurements.
b. A hasty reader believes that the interval given in the table is a confidence interval for the mean height of willow plants in this region of the park. Find the actual confidence level for the given interval.
Suppose we want a 90% confidence interval for the average amount spent on books by freshmen in their first year at a major university. The interval is to have a margin of error of at most \(2. Based on last yearโs book sales, we estimate that the standard deviation of the amount spent will be close to \)30. The number of observations required is closest to which of the following?
a.
b.
c.
d.
e.
More weight loss Refer to Exercise . Interpret the confidence level.
Oranges A home gardener likes to grow various kinds of citrus fruit. One of his
mandarin orange trees produces oranges whose circumferences follow a Normal
distribution with mean cm and standard deviation cm.
a. What is the probability that a randomly selected orange from this tree has a
circumference greater than cm?
b. What is the probability that a random sample of oranges from this tree has a mean circumference greater than cm?
You have measured the systolic blood pressure of an SRS of company employees. A confidence interval for the mean systolic blood pressure for the employees of this company is . Which of the following statements is true?
a. of the sample of employees have a systolic blood pressure between 122 and .
b. of the population of employees have a systolic blood pressure between and.
c. If the procedure were repeated many times, of the resulting confidence intervals would contain the population mean systolic blood pressure.
d. If the procedure were repeated many times, of the time the population mean systolic blood pressure would be between and .
e. If the procedure were repeated many times, of the time the sample mean systolic blood pressure would be between .
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