# stats pt 1

Shargrodosky, Curhan, Curhan, and Eavey(2010)studied whether hearing loss among teens has increased. The researchers compared a random sample of 2928 teens from a 1994 study to a random sample of 1771 teens from a 2006 study . In the 1994 study, 480 teens had hearing loss while in the 2006 study, 333 had hearing loss. The researchers are trying to estimate the difference in the two populations,

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. The researchers tested the hypotheses

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They calculated a p-value=0.0343 and Z=2.12 and designated

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0.05

. Answer the following questions using this information.

Identify the explanatory and the response variable.

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Flag this QuestionQuestion 210 pts

Select all of the following statements that are correct.

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A clinical study conducted in the early 1990s recruited 324 pregnant women who were HIV-positive. The researchers believe that the pregnant women taking AZT will have fewer babies born HIV-positive. Of the 164 women who were randomly assigned to use the experimental (at the time) drug AZT, 13 had HIV-positive babies. Of the 160 women who were randomly assigned to receive a placebo, 40 had HIV-positive babies. The data has been summarized in the following table. Use this information to answer the following questions.

 AZT mothers Placebo mothers ROW TOTAL HIV-positive baby 13 40 53 not HIV-positive baby 151 120 271 COLUMN TOTAL 164 160 n = 321

Flag this QuestionQuestion 38 pts

Is this study an observational study or an experiment?

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Flag this QuestionQuestion 46 pts

Identify all of the parameters for this study.

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A

Z

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is the long-run proportion of HIV-positive babies born to women taking AZT.

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is the long-run proportion of HIV-positive babies born to women taking the placebo.

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is the long-run proportion of HIV-positive babies born .

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is the long-run proportion of non-HIV-positive babies born.

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is the long-run proportion of women taking AZT.

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is the long-run proportion of women taking the placebo.

Flag this QuestionQuestion 56 pts

Write out the null and alternative hypotheses for this study.

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Flag this QuestionQuestion 66 pts

Are the validity conditions satisfied for this study?

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A random selection of married couples from Joliet, IL were asked to state how much TV they watched in the week of June 2 to June 8, 2019. The researchers are trying to determine if there is any difference in the TV watching habits between married couples. A matched pairs design was used and for each couple the difference (Wife – Husband) was calculated for each couple. The sample summary statistics and boxplots of the data are presented below.

Flag this QuestionQuestion 76 pts

State the null and alternative hypotheses.

Group of answer choices

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