Based on previous research and sound theoretical considerations, an experimental psychologist believes that memory for pictures is superior to memory for words. To test this hypothesis, the psychologist performs an experiment in which students from a introductory psychology class are used as subjects. Eight randomly selected students view 30 slides with nouns printed on them, and another group of eight randomly selected students view 30 slides with actual pictures of the same nouns. Each slide contains either one noun or one picture and is viewed for 4 seconds. After viewing the slides, students are given a recall test. The number of correctly recalled items is recorded. The data collected are given below. a. Describe (1) the independent variable and its levels, and (2) the dependent variable and its scale of measurement. b. Describe the null and alternative hypotheses for the study described. c. Using Excel, conduct a statistical test of the null hypothesis at p=.05. Be sure to properly state your statistical conclusion. d. Provide an interpretation of your statistical conclusion in part C. e. What type of statistical error might you have made in part C? f. Obtain the 95% confidence interval using the obtained statistic. g. Provide an interpretation of the confidence interval obtained in part f. h. Does the confidence interval obtained support your statistical conclusion? Explain your answer.