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Q1) Though there is popular belief that herbal remedies like Ginkgo biloba and Ginseng may improve learning and memory in healthy adults, these effects are generally not supported by well-controlled research (Peressson, Bringlov, Nilsson, & Nyberg, 2004). In typical study, researcher obtains sample of n=36 participants and has each person take herbal supplements everyday for 90 days. At end of 90 days, each person takes standardized memory test. For general population, scores from test are normally distributed with mean μ = 80 and a standard deviation of σ = 18. Sample of research participants had average of M = 84.
a) In sentence, mention null hypothesis to be tested.
b) Using symbols mention null hypothesis and alternative hypothesis
c) Conduct the hypothesis test using a two-tailed test with a = 0.05.
Determine the probability that mean height of random sample of 100 women is greater than 66 inches?
Fix-It Copiers advertises mean time of 100 minutes for office calls with standard deviation of 25 minutes. What percentages of calls are completed?
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
Determine z score corresponding to minimum height requirement and determine z score corresponding to maximum height requirement.
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Create the table for frequency distribution that has 16 class intervals of width 1 inch. Utilize 61.5 inches as lower limit of first interval and 62.5 as upper limit.
Estimate the probability the store will gross over $850 a) At least 3 out of 5 business days.
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
How large a sample is needed to find the population mean within $250 at 99 percent confidence?
Provide a discussion that supports the assumption that the variance of savings increases with family income.
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