HELP PLEASE

CASE 2 For the following cases, suggest the most appropriate statistical method for the research question and provide the reasons from the following: One sample z-test, One sample t-test, Two independent samples t-test, Paired t-test 6. Many neuroscientists believe that the capacity of a person's working memory is seven items, give or take two. How much does memorizing something new crowd out something previously memorized? In one study, subjects were given 1 minute to memorize a list of 10 words (each 8 - 10 letters long), after which they wrote down as many of the words as they could remember; this number is called "Recalll." The subjects then repeated this process with a second list of 10 words, after which they were also asked to write down as many words as they could remember from the first list. This number is "Recall 2." The results have considerable variation from person to person. [3 points] . Researchers studied subjects who had pneumonia and classified them as being in one of two groups: those who were given medical therapy that is consistent with American Thoracic Society (ATS) guidelines and those who were given medical therapy that is inconsistent with ATS guidelines. Is there any difference in time for the subjects to return to work? [3 points] 8. A sample of 25 freshman nursing students made a mean score of 77 on a test designed to measure attitude toward the dying patient. The population standard deviation was 10. Do these data provide sufficient evidence to indicate, at the .05 level of significance, that the population mean is less than 80? [3 points]