What type of research question examines the variation in the number of unmarried American couples across the 30 years? A comparative B developmental C factual D theoretical Continue
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Adi S.
According to a study done by the Pew Research Center, 39% of adult Americans believe that marriage is obsolete. (a) Suppose a random sample of 200 adult Americans is asked whether marriage is obsolete. Is the response to this question quantitative or categorical? (1 point) (b) Suppose a random sample of 200 adult Americans is obtained. Describe the shape, center, and spread of the sampling distribution of sample proportions. (6 points) (c) Would it be unusual for a survey of 200 adult Americans to result in 88 or more who believe marriage is obsolete? Briefly explain. (3 points) (d) What is the probability that in a random sample of 200 adult Americans, between 40% and 50% believe that marriage is obsolete? (2 points)
Kari H.
Refer to the following setting. The National Longitudinal Study of Adolescent Health interviewed a random sample of 4877 teens (grades 7 to 12 ). One question asked was "What do you think are the chances you will be married in the next ten years?" Here is a two-way table of the responses by gender: ${ }^{28}$ $$ \begin{array}{lcc} \hline & \text { Female } & \text { Male } \\ \text { Almost no chance } & 119 & 103 \\ \text { Some chance, but probably not } & 150 & 171 \\ \text { A 50-50 chance } & 447 & 512 \\ \text { A good chance } & 735 & 710 \\ \text { Almost certain } & 1174 & 756 \\ \hline \end{array} $$ The appropriate null hypothesis for performing a chi-square test is that (a) equal proportions of female and male teenagers are almost certain they will be married in 10 years. (b) there is no difference between the distributions of female and male teenagers' opinions about marriage in this sample. (c) there is no difference between the distributions of female and male teenagers' opinions about marriage in the population. (d) there is no association between gender and opinion about marriage in the sample. (e) there is no association between gender and opinion about marriage in the population.
Inference for Distributions of Categorical Data
Inference for Two-Way Tables
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