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Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6 mg/L. For 26 younger men the sample standard deviation was 84.2 mg/L. At the .01 level of significance, do these data support the conclusion that the ferritin distribution in elderly men has a smaller variance than in younger men?
A. No, because the test value 1.60 is less than the critical value of 2.54B. Yes, because the test value 2.56 is greater than the critical value of 2.54C. Yes, because the test value 0.390 is less than the critical value 2.54D. Yes, because the test value 2.56 is greater than the critical value 0.394
A study of postoperative pain relief is conducted to determine if drug A has a significantly longer duration of pain relief than drug B.
Find the product of the vector of state probabilities for the preceding period and the matrix of transition probabilities.
Union Membership Nationwide 13.7% of employed wage and salary workers are union members (down from 20.1% in 1983). A random sample of 300 local wage and salary workers showed that 50 belonged to a union.
Distinct random variable
Use the Rare Event Rule. Does the evidence support the claim?
Based on this information, determinethe probability that specific fare will exceed $15.00?
Randomly selected nonfatal occupational injuries and illnesses are categorized, according to the day of the week that they first occured, and the results are listed below.
The ages of U.S. aircraft have a mean of 13.0 years and a standard deviation of 7.9 years. If the Federal Aviation Administration randomly selects 35 commercial aircraft for special stress tests, find the probability that the mean age of this samp..
The engineer can spend $173 for the two components. To the nearest two decimal places, what is the largest component probabilty that can be achieved?
The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation of 6. Find the percentage of students that scored above 70.
A random sample of 50 students from this school was selected, and the mean math SAT score was 530. Is the high school justified in its claim? Explain.
The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Suppose a sample of 40 Americans is taken to further investigate viewing habits.
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