Chapter 10: Q.10.2 (page 404)
Define the phrase independent samples.
Short Answer
Independent samples means that a sample taken from one population should have no bearing on samples taken from another.
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Chapter 10: Q.10.2 (page 404)
Define the phrase independent samples.
Independent samples means that a sample taken from one population should have no bearing on samples taken from another.
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10.33 Regarding the four conditions required for using the pooled procedures:
a. what are they?
b. how important is each condition?
V. Tangpricha et al. did a study to determine whether fortifying orange juice with Vitamin D would result in changes in the blood levels of five biochemical variables. One of those variables was the concentration of parathyroid hormone (PTH), measured in picograms/milliliter ( pg/ml ). The researchers published their results in the paper "Fortification of Orange Juice with Vitamin D: A Novel Approach for Enhancing Vitamin D Nutritional Health" (American Journal of Clinical Nutrition, Vol. 77, pp. 1478-1483). Concentration levels were recorded at the beginning of the experiment and again at the end of weeks. The following data, based on the results of the study, provide the decrease (negative values indicate an increase) in PTH levels, in pg/ml, for those drinking the fortified juice and for those drinking the unfortified juice.

At the significance level, do the data provide sufficient evidence to conclude that drinking fortified orange juice reduces PTH level more than drinking unfortified orange juice? (Note: The mean and standard deviation for the data on fortified juice are and , respectively, and for the data on unfortified juice, they are and, respectively.)
Gender and Direction. Refer to Exercise 10.46 and obtain a 98% confidence interval for the difference between the mean absolute pointing errors for males and females.

Give an example of interest to you for comparing two population means. Identify the variable under consideration and the two populations.
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