MATH 302-MATH302 QUIZ 5

MATH 302-MATH302 QUIZ 5 Top of Form Quiz 5 MATH302 Return to Assessment List Part 1 of 8 - 2.0/ 3.0 Points Question 1 of 17 1.0/ 1.0 Points Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means, . The sampling distribution of the sample mean difference, is: A.approximately normal B.chi-squared distributed with 99 degrees of freedom C.t - distributed with 98 degrees of freedom D.normally distributed Answer Key: A Question 2 of 17 1.0/ 1.0 Points Which of the following statements is true regarding the F – distribution? A.It is a distribution of negative values B.It is always skewed to the left C.It typically appears in tests of equal proportions D.none of the above Answer Key: D Question 3 of 17 0.0/ 1.0 Points 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.Yes, because the test value 2.56 is greater than the critical value 0.394 B.Yes, because the test value 0.390 is less than the critical value 2.54 C.No, because the test value 1.60 is less than the critical value of 2.54 D.Yes, because the test value 2.56 is greater than the critical value of 2.54 Answer Key: