Also, for each of the following problems, use the logic of hypothesis testing to answer the research question posed.Clearly state your null and alternative hypotheses, your test statistic, the p-value, and whether you can reject the null.Be sure to clearly state your conclusions in words.

A.A researcher is testing the effectiveness of a new drug that is intended to improve learning and memory performance.A random sample of 16 rats are given the drug and then tested on a standard learning task.The mean of the sample is 56.5.In the general population of rats (with no drug), the average score on the standardized test is normally distributed with a mean of m = 51.9 and a standard deviation of s_x = 10.2.Is there evidence that the drug improves memory scores?Set a = .05.What is the effect size (Cohen's d) of this effect?

B.A memory researcher devises a memory training program that he thinks will help people improve their short-term memory.It is well known that the average number of digits that people can remember using short term memory is 7.To test his theory, the researcher trains a random sample of 20 participants with his memory enhancement procedure and finds that they are now able to recall an average of M= 9.6 digits, with a standard deviation of 3.4.Is the new memory training program effective?Set a = .05. What is the effect size (Cohen's d) of this effect?