2. A researcher gives a group of participants (n = 15) a memory techni

2. A researcher gives a group of participants (n = 15) a memory techni

2. A researcher gives a group of participants (n = 15) a memory technique to use. He finds that they remember on average 20 words (sample standard deviation = 3) while the average number of words remembered in the population is 15.What is the null hypothesis?What is the research hypothesis?Is this a one or two tailed hypothesis?Which test should you use? Why?Calculate the appropriate statistical test.What is the critical value for ? = .05?What do you conclude?