TABLE 10-7 To Investigate the Efficacy of a Diet, a Random Sample

question 146

Short Answer

TABLE 10-7
To investigate the efficacy of a diet, a random sample of 16 male patients is drawn from a population of adult males using the diet. The weight of each individual in the sample is taken at the start of the diet and at a medical follow-up 4 weeks later. Assuming that the population of differences in weight before versus after the diet follow a normal distribution, the t-test for related samples can be used to determine if there was a significant decrease in the mean weight during this period. Suppose the mean decrease in weights over all 16 subjects in the study is 3.0 pounds with the standard deviation of differences computed as 6.0 pounds.
-Referring to Table 10-7, the t test should be ________-tail.

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Definitions:

Concrete Operations

A stage in child development, as per Piaget's theory, where logical thinking develops but is limited to tangible and concrete situations.

Formal Operations

The stage in Piaget's theory of cognitive development where individuals develop the ability to think abstractly, logically, and systematically.

Formal Operational

A stage of cognitive development in which individuals become capable of abstract thinking and logical reasoning.

Concrete Operational

A stage in Piaget's theory of cognitive development where children gain the ability to think logically about concrete events.