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.   What is alternate hypothesis symbol and z score ?

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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.

 

What is alternate hypothesis symbol and z score ? 

And final decision?

A.Fail to reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are significantly greater than those of the general population
B.Fail to reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are not significantly greater than those of the general population
C.Reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are significantly greater than those of the general population
D.Reject the null hypothesis and conclude that the memory scores of the sample after the “herbal supplement” treatment are not significantly greater than those of the general population
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