dit View Controls Store Window Help , Tue 1 mathd.com miechen kingsley 4/12/16 1
ID: 3153482 • Letter: D
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dit View Controls Store Window Help , Tue 1 mathd.com miechen kingsley 4/12/16 1:10 PM uiz: Chapter 8 Review Quiz his Question: 1 pt This Quiz: 19 pts possible E Question Help A 0.1 significance level is used for a hypothesis test of the claim that whien parents use a particular method of gender selection, the proporion of baby øirs s greater than 0.5 Assume that sample than 0.5. Assume that sample data consists of 45 girls in 81 births, so the sample (a) through (h) below. data consists of 45 girls in 81 births, so the sample statistic of results in a z score that is 1 standard deviation above 0. Complete parts a. Identify the null hypothesis and the alternative hypothesis. Choose the correct answer below. O B. Ho:p#0.5 Hy: p>0.5 O D. Ho: p 0.5 Hy:p 0.5 OA, Hope 0.5 H1 : p # 0.5 H1:p>0.5 b. What is the value of ? Earned 100% on Quiz Me: 7.2.2 Find critical values of z un thr Browser Check to make sure you have what you need toExplanation / Answer
a)
Formulating the null and alternatuve hypotheses,
Ho: p = 0.5
Ha: p > 0.5 [ANSWER, C]
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b)
As given,
alpha = 0.1 [ANSWER]
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c)
OPTION B: NORMAL DISTRIBUTION [ANSWER]
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d)
As Ha used > , it is RIGHT TAILED. [ANSWER]
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e)
As we see, the hypothesized po = 0.5
Getting the point estimate of p, p^,
p^ = x / n = 0.555555556
Getting the standard error of p^, sp,
sp = sqrt[po (1 - po)/n] = 0.055555556
Getting the z statistic,
z = (p^ - po)/sp = 1 [ANSWER, TEST STATISTIC]
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f)
As this is a 1 tailed test, then, getting the p value,
p = 0.1587 [ANSWER, P VALUE]
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g)
As alpha = 0.1, right tailed,
zcrit = 1.28 [ANSWER]
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h)
As alpha = 0.1, the area of the critical region is
Area = 0.1 [ANSWER]
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