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math11quiz7

# math11quiz7 - = lat/11"" Zea-J 2 — MATH 11 Spring...

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Unformatted text preview: = lat/11"" : Zea-J: 2 — MATH 11 Spring 2008 QUIZ 7 NAME: (Total 20 points) 1. (8 points) Use the given data to ﬁnd the minimum sample size required to estimate a population proportion or percentage. Margin of error: 0040; conﬁdence level: 99%; from a prior study, :5 is estimated by the decimal equivalent of 30% Emma ?' “ziloiy‘sgt : [q_515]?(0,5o)(or\c>7 g (WHOM) QB)®.§D-OJO) El (0‘043071 (9045’? we 93333139 - Blhﬂlm°1°ﬂs l n= rm} 0.00W) 2. (12 points) Use the following conﬁdence level and sample data to ﬁnd (a) the margin of error E and (b) a conﬁdence interval for estimating the population mean u. Ages of drivers occupying the passing lane while driving 25mi / h with the left signal ﬂashing: 95% conﬁdence; n = 50, E = 80.5 years, and a is known to be 4.6 years. \—a= 05% we‘ll. Ze—‘Lzmw h/CJO Ii: gu‘g 0—:&‘\o QlE‘ZaElU/W «mm/m = \~1‘W’°‘°‘+8lEEl by {eve (Jo‘ (jg? E. so.%— was (Jot < novLﬂﬁ ...
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