ECON
ECON 230 Workshop Proportions Ch 9

# ECON 230 Workshop Proportions Ch 9 - Chap 9 — Hypothesis...

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Unformatted text preview: Chap. 9 — Hypothesis Test — Proportion — Class Practice 9.87. Suppose that in a recent sample of 1600 children, 224 were found to be living with at least 1 grandparent. At a 5% level of signiﬁcance can you test the hypothesis t at the proportion is greater than 1 1%? /i\\ & Ho (J E A ‘ 1 “A. ‘4 §Jl (“lsh'l ital} baud 0"- “A ’2, 23335: +1.95 ' ' TS l'C’L’I .67qu “MPH A ‘ ng 2:?4? (.08 ,‘1505 0'? Slat: xWL TS dckuF.l|"‘ lib“ Q- .3»- (‘cg'mm W" “35‘" HO , E’V-“Ilrnl U5 ‘- “"93“ ("BC") '- om? . ”‘1“ {MW' at g dwt‘l ﬂ ’ ‘Qoo ‘ \‘w-hs wl ,3? t8 . 9.88 According to a 2011 book, 45% of US. students show no gain in learning in their ﬁrst 2 years. A recent sample of 1500 showed that this percentage is 38%. Test the hypothesis that this percentage is (a) lower than 45% (b) equal to 45W. Use the 1% level of signiﬁcance. ...
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