Questions from Essentials of Statistics

Q: The Internal Revenue Service (IRS) publishes data on adjusted gross

The Internal Revenue Service (IRS) publishes data on adjusted gross incomes in the document Statistics of Income, Individual Income Tax Returns. The following relative-frequency histogram shows one ye...

Q: E. Bergman et al. conducted a study to determine,

E. Bergman et al. conducted a study to determine, among other things, the impact that scheduling recess before or after the lunch period has on wasted food for students in grades three through five. R...

Q: Refer to Exercise 10.45 and obtain a 90% confidence

Refer to Exercise 10.45 and obtain a 90% confidence interval for the difference between the mean times served by prisoners in the fraud and firearms offense categories. Data from Exercise 10.45: The...

Q: Refer to Exercise 10.46 and obtain a 98% confidence

Refer to Exercise 10.46 and obtain a 98% confidence interval for the difference between the mean absolute pointing errors for males and females. Data from Exercise 10.46: In the paper “The Relation o...

Q: Refer to Exercise 10.47 and find a 90% confidence

Refer to Exercise 10.47 and find a 90% confidence interval for the difference between the mean reductions in PTH levels for fortified and unfortified orange juice. Data from Exercise 10.47: V. Tangpr...

Q: Refer to Exercise 10.48 and determine a 95% confidence

Refer to Exercise 10.48 and determine a 95% confidence interval for the difference between last year’s mean VMTs by midwestern and southern households. Data from Exercise 10.48: Data on household veh...

Q: Refer to Exercise 10.49 and determine a 99% confidence

Refer to Exercise 10.49 and determine a 99% confidence interval for the difference between mean spleen lengths of Nigerian males and females. Data from Exercise 10.49: O. Ehimwenma and M. Tagbo, rese...

Q: Refer to Exercise 10.50 and find a 98% confidence

Refer to Exercise 10.50 and find a 98% confidence interval for the difference between the mean amount of food wasted for lunches before recess and that for lunches after recess. Data from Exercise 10...

Q: Philosophical and health issues are prompting an increasing number of Taiwanese to

Philosophical and health issues are prompting an increasing number of Taiwanese to switch to a vegetarian lifestyle. In the paper “LDL of Taiwanese Vegetarians Are Less Oxidizable than Those of Omnivo...

Q: The paper “Correlations Between the Intrauterine Metabolic Environment and Blood Pressure

The paper “Correlations Between the Intrauterine Metabolic Environment and Blood Pressure in Adolescent Offspring of Diabetic Mothers” (Journal of Pediatrics, Vol. 136, Issue 5, pp. 587–592) by N. Cho...