obtains a sample of n = 16 participants and 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 popula- tion, scores from the test form a normal distribution with a mean of u 50 and a standard deviation of o = 12. The sample of research participants had an average of M = 54. %3D %3D

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6. 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 (Persson, Bringlov, Nilsson,
and Nyberg, 2004). In a typical study, a researcher
Transcribed Image Text:6. 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 (Persson, Bringlov, Nilsson, and 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 popula-
tion, scores from the test form a normal distribution
with a mean of u = 50 and a standard deviation of
o = 12. The sample of research participants had an
average of M = 54.
a. Assuming a two-tailed test, state the null hypoth-
esis in a sentence that includes the two variables
%3D
being examined.
b. Using the standard 4-step procedure, conduct a
two-tailed hypothesis test with a = .05 to evaluate
the effect of the supplements.
Transcribed Image Text: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 popula- tion, scores from the test form a normal distribution with a mean of u = 50 and a standard deviation of o = 12. The sample of research participants had an average of M = 54. a. Assuming a two-tailed test, state the null hypoth- esis in a sentence that includes the two variables %3D being examined. b. Using the standard 4-step procedure, conduct a two-tailed hypothesis test with a = .05 to evaluate the effect of the supplements.
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