QMB-210 Lecture Notes - Lecture 19: Probability Distribution, Standard Deviation, South Dakota Highway 25

• School: University of Tampa
• Department: Quantitative Methods in Business
• Course: QMB-210
• Professor: Shaista Nisar

Document Summary

If we can"t fi(cid:374)d the sa(cid:373)ple (cid:373)ea(cid:374) a(cid:374)d we do(cid:374)"t k(cid:374)ow it we assu(cid:373)e it is the sa(cid:373)e as the population mean. Visa versa: z = x(bar) u /(o/srn) Proportion: to find the portion of something we need to find the z-score, zp= p(bar) p / op. Summary: sampling methods, sampling errors (x(bar) u, central limit theorem (n>30, probability of mean, probability or proportion. Welsh 2: the amount of pyridoxine (in grams) per multiple vitamin is normally distributed with = 110 grams and = 25 grams. Find the probability for both 100 and 120, then highest minus the lowest: Z = 100-110 /(25/sr25) >> -2 = 0. 0228. Z = 120 -110 / (25/sr25) >> 2 = 0. 9772. 0. 9772 0. 0228 = 0. 9544: the amount of pyridoxine (in grams) per multiple vitamin is normally distributed with = 110 grams and = 25 grams. A sample of 25 vitamins is to be selected.