Some researchers claim that herbal supplements improve human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given herbal supplements daily for 6 weeks and then all the participants are given a standardized memory test. For the population, scores on the tests are normally distributed with µ = 70 and σ= 20. The sample of n = 25 students had a mean score of M = 80. Can we conclude that the memory scores of the sample after the “herbal supplement” treatment are significantly greater than those of the general population(population mean before treatment)? Perform a hypothesis test using a z- score statistic. Use a one-tailed test with α = .05. a. You will be using the z-score statistic instead of the t test to test the hypotheses because b. The alternative hypothesis in symbols is c. The critical z-value and the z-score statistic is is d.Which of the following is the correct decision for this hypothesis test:
Some researchers claim that herbal supplements improve human memory. To test this claim, a researcher selects a sample of n = 25 college students. Each student is given herbal supplements daily for 6 weeks and then all the participants are given a standardized memory test. For the population, scores on the tests are
a. You will be using the z-score statistic instead of the t test to test the hypotheses because
b. The alternative hypothesis in symbols is
c. The critical z-value and the z-score statistic is is
d.Which of the following is the correct decision for this hypothesis test:
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