MATH_221_EXERCISE_7A_ANSWERS_FA_09[1]

MATH_221_EXERCISE_7A_ANSWERS_FA_09[1] - M ATH 2 21...

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MATH 221 Statistics for Decision - Making Exercise Set 7A Student Name  Answer Key           Section ___ Date ________ 0 Sampling Techniques, Hypothesis Testing (1) How many different samples of size  n   =   6 can be drawn from a population of size  {=COMBIN(12,6)} N   =   12 ? (a) 665,280 (b) 924 (c) 2 (d) 6  12 (e) 2,985,984 (2) What is the probability of each sample if a random sample of size 5 is to  be drawn from  a finite population of size 10 ?  Round your answer to four decimal places.  {=1/COMBIN(10,5)} (a) 0.0030 (b) 0.0000 (c) 25.2000 (d) 0.0397 (e) 0.0040 (3) There are exactly 220 different samples of size  n   =   10 that can be drawn from a  population of size  N   =   20 .  {=COMBIN(20,10)} (a) True (b) False (4) Stratification is a statistical procedure that consists of dividing the population into a  number of non - overlapping subpopulations, referred to as strata . (a) True (b) False (5) The Central Limit Theorem  basically states that for large samples, the sampling  distribution of the mean can be approximated closely with a normal distribution.  (a) True (b) False (6) A budget manager considers the purchase of a new photocopy machine.  The manager  believes the hypothesis that this new machine will be equal to or better in performance  than the existing photocopy machine.  Six months after its purchase, the manager  notices that the new machine is consistently poor in performance and requires more 
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MATH_221_EXERCISE_7A_ANSWERS_FA_09[1] - M ATH 2 21...

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