The table to the right shows the results of a survey in which
26002600 adults from Country A,11081108 adults from Country B, and10911091 adults from Country C were asked if human activity contributes to global warming. Complete parts (a), (b), and (c). |
|
(a) Construct a
9999%
confidence interval for the proportion of adults from
Country Upper ACountry A
who say human activity contributes to global warming.
left parenthesis nothing comma nothing right parenthesis0.6360.636,0.6840.684
(Round to three decimal places as needed.)(b) Construct a
9999%
confidence interval for the proportion of adults from
Country Upper Country B
who say human activity contributes to global warming.
left parenthesis nothing comma nothing right parenthesis,
(Round to three decimal places as needed.)
Ans:
A)
lower limit=0.66-2.576*SQRT(0.66*(1-0.66)/2600)=0.636
Upper limit=0.66+2.576*SQRT(0.66*(1-0.66)/2600)=0.684
B)
lower limit=0.89-2.576*SQRT(0.89*(1-0.89)/1108)=0.866
Upper limit=0.89+2.576*SQRT(0.89*(1-0.89)/1108)=0.914
C)
lower limit=0.95-2.576*SQRT(0.95*(1-0.95)/1091)=0.933
Upper limit=0.95+2.576*SQRT(0.95*(1-0.95)/1091)=0.967
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