Hi I need help on what is the answer for my learning activity. Below are the question and answer with explanation is optional. Other concerns will be in the comment section and also the reference. I hope that you can help me and surely I will give you a positive feedback

Learning Activity Perform as indicated: 1. Researchers in a certain medical center are interested in assessing the effect of chronic lecithin use on total blood cholesterol. A sample of ten middle-aged men with hypercholesterolemia had their total blood cholesterol measured prior to and following a six-month regimen of lecithin intake. The results for total blood cholesterol (CH) level in mg/dl are as follows: Subject 1 2 3 4 5 6 7 8 9 10 Pre CH 239 245 233 255 267 239 246 247 242 234 Post CH 232 256 223 260 255 238 243 235 247 221 Assume that total blood cholesterol values follow a normal distribution. Using the 0.05 level of significance, test whether the population mean blood cholesterol changed after prolonged lecithin use. (Hint: Observations are paired) 2. A journal article reported the results of an analysis of the weight of calcium in standard cement and cement doped with lead. Reduced levels of calcium would indicate that the hydration mechanism in the cement is blocked and would allow water to attack various locations in the cement structure. Ten samples of standard cement had an average weight percent calcium of 90.0 with a sample standard deviation of 5.0, and 15 samples of the lead-doped cement had an average weight percent calcium of 87.0 with a sample standard deviation of 4.0. Assume that the population variances are not significantly different, is there sufficient evidence that lead-doped cement have lower levels of calcium than standard cement? Use a 1% level of significance. (Hint: a * and a ; are unknown but a * = o; = g?) References ALMEDA, J.V., T.S. CAPISTRANO, and G.M.F. SARTE. 2010. Elementary Statistics. The University of the Philippines Press, Quezon City. pp. 535- 547