state the null and alternative hypotheses by selecting the appropriate symbolH1:H0:

A dietitian wishes to see if a person's cholesterol level will be changed if the diet is supplemented by a certain mineral. Four subjects were pre-tested, and they took the mineral supplement for a 6-week period. The results are shown in the table. Is there sufficient evidence to conclude that the population mean of cholesterol levels has been changed after six weeks at o = 0.2? Assume that the differences are from an approximately normally distributed population. Cholestrol Level Cholestrol Level after 6 Subject d d ( d - d ) ? (mg/dl) Weeks (mg/dl) 1 216 215 -1 2 233 182 -51 3 236 189 47 4 197 207 10 Total -89 a) Calculate the mean, the sum of the squared deviation from the mean, and the standard deviation of differences. Do not include the unit for each answer. i. d - (do not round) it. E (d - a)? (do not round) iii. Sd rounded to one decimal place)