Homework Answers
1)
2)
| standard error se=√(S21/n1+S22/n2)= | 1.2607 | ||
| test stat t =(x1-x2-Δo)/Se= | 1.6340 | ||
3)
| p value : = | 0.1040 |
4)
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(5 points) Weight gain during pregnancy. In 2004, the state of North Carolina released to the...
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5. Conduct a test at the a=0,01 level of significance by determining (a) the null and alternative hypotheses, (b) the test statistic, and (c) the P-value. Assume the samples were obtained independently from a large population using simple random sampling. Test whether P, > P2. The sample data are xy = 116, n = 251, x2 = 132, and n2 = 301 (a) Choose the correct null and alternative hypotheses below. O A. Ho: P1 = P2 versus H: PHP2...
Recent incidents of food contamination have caused great concern
among consumers. An article reported that 33 of 80 randomly
selected Brand A brand chickens tested positively for either
campylobacter or salmonella (or both), the leading bacterial causes
of food-borne disease, whereas 69 of 80 Brand B brand chickens
tested positive.
(a)
Does it appear that the true proportion of non-contaminated
Brand A chickens differs from that for Brand B? Carry out a test of
hypotheses using a significance level 0.01....
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In 2004, the FDA released a report suggesting that a particular class of antidepressants (selective serotonin reuptake inhibitors or SSRIS) may increase the risk of "suicidality" in adolescents. The concern led to a black box warning on SSRIS and other antidepressants for users younger than 25. The issue spurred a debate in the psychiatric research community concerning the core issue of whether suicidality, a measure of suicidal tendencies, accurately represents how likely an adolescent is to commit suicide. The reason...
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