Questions 12a, 12b & 12c ask about different components of a…
Questions 12a, 12b & 12c ask about different components of a confidence interval from the same research study, presented below. Researchers used a sample of n = 140 households in the US with cats to estimate that 35% of household cats in the US hunt outdoors. Source: “Domestic cats kill many more wild birds in the United States than scientists thought,” Milius, S. Science News, Feb 2013. What is the best estimate for the parameter we are estimating? Give the notation and numerical value.
Read DetailsQuestions 13a, 13b, 13c ask about different parts of a hypot…
Questions 13a, 13b, 13c ask about different parts of a hypothesis test from the same research study, presented below. Multiple-choice questions on Advanced Placement exams have five options: A, B, C, D, and E. A random sample of the correct choice on 400 multiple-choice questions on a variety of AP exams shows that B was the most common correct choice. 90 of the 400 (90/400= 0.225) questions in the sample had B as the answer. We are interested to know if this sample provides evidence that B is more likely to be the correct choice than would be expected if all five options were equally likely. That is, we are testing vs where = the true proportion of all AP questions that have B as the answer. What is the z-standardized test statistic for this scenario? Choose only one option below. Please pay careful attention to the answer choices; there are subtle differences in each option and there is only one correct answer. In particular, pay attention to the order of the proportions in the numerator and the proportion used in the denominator. f you think there are two valid options, note that the right choice is consistent with the formula in your STA 270 textbook (and the alternative hypothesis).
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