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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

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Chapter
Section
BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

Although there is a popular belief that herbal remedies such as Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research (Person, Bringlov, Nilsson, & Nyberg, 2004). In a typical study, a researcher obtains a sample of n = 16 participants and has each person take the herbal supplements every day for 90 days. At the end of the 90 days, each person takes a standardized memory test. For the general population, scores from the test form a normal distribution with a mean of μ = 50 and a standard deviation of σ = 12. The sample of research participants had an average of M = 54.

a. Assuming a two-tailed test, state the null hypothesis in a sentence that includes the two variables being examined.

b. Using the standard 4-step procedure, conduct a two-tailed hypothesis test with α = .05 to evaluate the effect of the supplements.

a.

To determine
The null hypothesis in sentences that includes the two variables being examined.

Explanation

Given info:

Sample mean is given as 54, population mean is given as 50, standard deviation is given as 12 and sample size is given as 16.

Justification:

The null hypothesis states that there is no effect of the treatment. In other words null hypothesis states that there is no change before and after treatment. In this question null hypothesis states that there is no change in scores whether they take supplements or not...

b.

To determine

To identify: The effect of studying from an electronic screen using the standard four step procedure for two-tailed test.

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