A psychologist was interested in whether men tend to show signs of Alzheimer’s disease at an earlier are than women. Below are the ages of onset of Alzheimer’s symptoms for a sample of men and women. Test the null hypothesis that there is no difference between the age of onset of Alzheimer’s symptoms for men and women.
Men Women
67……………………….. 70
73……………………….. 68
70……………………….. 57
62……………………….. 66
65……………………….. 74
59……………………….. 67
80……………………….. 61
66……………………….. 72
………………………..….64