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MATH_221_EXERCISE_6A_ANSWERS_FA_09[1]_UPDATED[1](2)

MATH_221_EXERCISE_6A_ANSWERS_FA_09[1]_UPDATED[1](2) - M ATH...

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MATH 221 Statistics for Decision - Making Exercise Set 6A Student Name  Answer Key           Section ___ Date ________ Confidence Intervals For problems  (1)  through  (25)  , select the correct answer.      (1) Sampling is a method that helps us make decisions about a population. (a)     True (b)     False (2) Descriptive statistics primarily involves estimation and hypothesis testing.  The purpose  of descriptive statistics is to make decisions about population characteristics. (a)     True (b)     False (3) The best point estimate of the population mean is the sample mean. (a)     True (b)     False (4) A good estimate should be biased, consistent and relatively efficient.  (a)     True (b)     False (should be unbiased) (5) A random sample of railway prices ( in dollars ) for a one - way ticket from Detroit to  Chicago.  Find a point estimate for the population mean. 99 100 102 105 95 93 94 110 120 101 98 120 100 99 94 90 122 102 113 98 The point estimate for the price of all one way tickets from Detroit to Chicago is _____ . (99+100+102+105+95+93+94+110+120+101+98+120+100+99+94+90+122+102+113+9 8)/20 = 102.75 (a)     102.75 (b)     101.57 (c)     103.65 (d)     98.75 (e)     101 (6) An interval estimate is an interval, or range of values used to estimate a population  parameter. (7) The level of confidence, designated as  c  , is the probability that the interval estimate  contains the true population parameter. (8) When the sample size is at least 20 , the sampling distribution for the sample mean is  normally distributed. (a)     True (b)     False (at least 30) (use the “T” test and what not) ©  Copyright 2009 by P.E.P. 1
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MATH 221 Statistics for Decision - Making Exercise Set 6A Student Name  Answer Key           Section ___ Date ________
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