Questions from Essentials of Statistics

Q: Refer to Exercise 10.126 and find a 95% confidence

Refer to Exercise 10.126 and find a 95% confidence interval for the mean difference in measurement by the weight and groove methods. Data from Exercise 10.126: R. Stichler et al. compared two methods...

Q: Refer to Exercise 10.127 and obtain an 80% confidence

Refer to Exercise 10.127 and obtain an 80% confidence interval for the difference between the mean corneal thickness of normal eyes and that of eyes with glaucoma. Data from Exercise 10.127: Glaucoma...

Q: Refer to Exercise 10.128 and find a 98% confidence

Refer to Exercise 10.128 and find a 98% confidence interval for the difference between the mean times to fatigue on a treadmill in a hot and humid environment after cooling down with cold water and af...

Q: In the online paper “A Comparison of Two Computer Fonts:

In the online paper “A Comparison of Two Computer Fonts: Serif versus Ornate Sans Serif” (Usability News, Issue 5.3), researchers S. Morrison and J. Noyes studied whether the type of font used in a do...

Q: The cheetah (Acinonyx jubatus) is the fastest land mammal and

The cheetah (Acinonyx jubatus) is the fastest land mammal and is highly specialized to run down prey. The cheetah often exceeds speeds of 60 mph and, according to the online document “Cheetah Conserva...

Q: To assess the effects of two different strains of the tobacco mosaic

To assess the effects of two different strains of the tobacco mosaic virus, W. Youden and H. Beale randomly selected eight tobacco leaves. Half of each leaf was subjected to one of the strains of toba...

Q: In the article “Improved Outcome for Children With Disseminated Adenoviral Infection

In the article “Improved Outcome for Children With Disseminated Adenoviral Infection Following Allogeneic Stem Cell Transplantation” (British Journal of Haematology, Vol. 130, Issue 4, p. 595), B. Kam...

Q: The American Association of University Professors (AAUP) conducts salary studies

The American Association of University Professors (AAUP) conducts salary studies of college professors and publishes its findings in AAUP Annual Report on the Economic Status of the Profession. In Exa...

Q: In the Statistics Norway on-line article “The Times They

In the Statistics Norway on-line article “The Times They Are a Changing,” J. Kristiansen discussed the changes in age at the time of marriage in Norway. The ages, in years, at the time of marriage for...

Q: we have presented a confidence interval (CI) for the difference

we have presented a confidence interval (CI) for the difference, μ1 − μ2, between two population means. Interpret each confidence interval. 95% CI is from −20 to −15.