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StatisticsEssentials of Statistics for the Behavioral SciencesAlthough 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.BuyFind*arrow_forward*

8th Edition

Frederick J Gravetter + 1 other

Publisher: Cengage Learning

ISBN: 9781133956570

Chapter 8, Problem 3P

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
*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

Essentials of Statistics for the Behavioral Sciences

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Ch. 8.1 - The city school district is considering increasing...Ch. 8.1 - If the alpha level is increased from = .01 to =...Ch. 8.1 - If a researcher conducted a hypothesis test with...Ch. 8.1 - A researcher selects a sample of n = 16...Ch. 8.1 - A small value (near zero) for the z-score...Ch. 8.1 - A z-score value in the critical region means that...Ch. 8.2 - Define a Type I error.Ch. 8.2 - Define a Type II error.Ch. 8.2 - Under what circumstances is a Type II error likely...Ch. 8.2 - If a sample mean is in the critical region with =...

Ch. 8.2 - If a sample mean is in the critical region with =...Ch. 8.3 - A researcher conducts a hypothesis test with =...Ch. 8.3 - In a research report, the term significant is used...Ch. 8.3 - In a research report, the results of hypothesis...Ch. 8.3 - If other factors are held constant, increasing the...Ch. 8.3 - If other factors are held constant, are you more...Ch. 8.4 - A researcher selects a sample from a population...Ch. 8.4 - If a sample is sufficient to reject the null...Ch. 8.4 - A researcher obtains z = 2.43 for a hypothesis...Ch. 8.5 - Explain how increasing the sample size influences...Ch. 8.5 - A researcher selects a sample from a population...Ch. 8.5 - A researcher selects a sample from a population...Ch. 8.6 - As the power of a test increase, what happens to...Ch. 8.6 - For a 5-point treatment effect, a researcher...Ch. 8.6 - How does sample size influence the power of a...Ch. 8.6 - A researcher administers a treatment to a sample...Ch. 8 - The value of the z-score in a hypothesis test is...Ch. 8 - Define the alpha level and the critical region,...Ch. 8 - Although there is a popular belief that herbal...Ch. 8 - Childhood participation in sports, cultural...Ch. 8 - A local college requires an English composition...Ch. 8 - A random simple is selected from a normal...Ch. 8 - A random sample of n = 25 scores is selected from...Ch. 8 - Brunt, Rhee, and Zhong (2008) surveyed 557...Ch. 8 - A random simple is selected from a normal...Ch. 8 - In a study examining the effect of alcohol on...Ch. 8 - The researchers cited in the previous problem...Ch. 8 - There is some evidence indicating that people with...Ch. 8 - Researchers at a National Weather Center in the...Ch. 8 - Montarello and Martens (2005) found that...Ch. 8 - Researchers hate noted a decline in cognitive...Ch. 8 - A researcher plans to conduct an experiment...Ch. 8 - A sample of n = 40 is selected from a normal...Ch. 8 - Briefly explain how increasing sample size...Ch. 8 - Explain how the power of a hypothesis test is...Ch. 8 - A researcher is investigating the effectiveness of...Ch. 8 - A researcher is evaluating the influence of a...Ch. 8 - Find each of the requested values for a population...Ch. 8 - A survey of high school seniors shows that the...Ch. 8 - Miller (2008) examined the energy drink...

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