Some Researchers Claim That Herbal Supplements Such as Ginseng or Ginkgo

question 34

Essay

Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human memory.To test this claim,a researcher selects a sample of n = 25 college students.Each student is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a standardized memory test.For the population,scores on the test are normally distributed with μ = 70 and σ = 15.The sample of n = 25 students had a mean score of M = 75.
a. Are the data sufficient to that the herb has a significant effect on memory? Use a two-tailed test with α = .05.
b. Compute Cohen's d for this study.

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Definitions:

Variable Cost Concept

The principle that costs vary in proportion to the level of production or activity. These costs increase as production increases and decrease as production decreases.

Markup Percentage

The amount by which the cost of a product is increased to arrive at the selling price, expressed as a percentage of the cost.

Fixed Costs

Expenses that do not change with the level of goods or services produced by the business over the short term.

Product Cost Concept

The accounting principle that determines the cost of a product by adding the costs of raw materials, labor, and overhead incurred in its production.