Question

RESEARCH SCENERIO An investigator thinks that people under the age of forty have vocabularies that are different than those of people over sixty years of age. The investigator administers a vocabulary test to a group of 31 younger subjects and to a group of 31 older subjects. Higher scores reflect better performance. Does this experiment provide evidence for the investigator's theory?      

                                           Younger group           Older group

                                                 n = 31                 n = 31

                                                M = 14.0              M = 20.0

                                               SS =   750            SS = 1080

Please calculate the appropriate hypothesis test using all FOUR STEPS (hint: Use a two-tailed test with an α = .05).

Answer 1