Introduction to Probability and Statistics for Engineers and Scientists

Problems 481

(c) Is there a gender difference?

(d) A randomly chosen group of 5 elderly men, without receiving any oxygen

treatment, were given the memory retention test. Their scores were 37, 35,

33, 39, 29. What conclusions can you draw?

Scores

Number of Weeks of Oxygen Treatment

012 3

Men 42 39 38 42

54 52 50 55

46 51 47 39

38 50 45 38

51 47 43 51

Women 49 48 27 61

44 51 42 55

50 52 47 45

45 54 53 40

43 40 58 42

29.In a study of platelet production, 16 rats were put at an altitude of 15,000 feet,

while another 16 were kept at sea level (Rand, K., Anderson, T., Lukis, G., and

Creger, W., “Effect of hypoxia on platelet level in the rat,”Clinical Research, 18 ,

Spleen Removed Normal Spleen

Altitude 528 434

444 331

338 312

342 575

338 472

331 444

288 575

319 384

Sea Level 294 272

254 275

352 350

241 350

291 466

175 388

241 425

238 344