University of California, Los Angeles STATS 10 Introduction to Statistical Reasoning Introduction to Statistical Reasoning Homework #9

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University of California, Los Angeles STATS 10 Introduction to Statistical Reasoning Introduction to Statistical Reasoning Homework #9 8.1:​ Choose one of the answers given. The null hypothes... is is always a statement about a (sample statistic or population parameter). - The null hypothesis is always a statement about a population parameter. 8.2: ​Choose one of the answers in each case. In statistical inference, measurements are made on a (sample or population), and generalizations are made to a (sample or population). - In statistical inference, measurements are made on a sample, and generalizations are made to a population. 8.5:​ Magic A magician claims he can cause a coin to come up heads more than 50% of the time. A coin is flipped 40 times, and 35 heads come up. A. Pick the correct null hypothesis: I. 0.50 B. Pick the correct alternative hypothesis: I. 0.50 8.6:​ Water A friend is tested to see whether he can tell bottled water from tap water. There are 30 trials (half with bottled water and half with tap water), and he gets 18 right. a. Pick the correct null hypothesis: I. 0.50 b. Pick the correct alternative hypothesis: p>0.50 8.7:​ Heart Attack Prevention A new drug is being tested to see whether it can reduce the chance of heart attack in people who have previously had a heart attack. The rate of heart attack in the population of concern is 2.0. The null hypothesis is that p (the population proportion using the new drug that have a heart attack) is 0.2 - Pick the correct alternative hypothesis: III. p<0.2 8.8:​ Stroke Survival Rate The proportion of people who live after suffering a stroke is 0.85. Suppose there is a new treatment that is used to increase the survival rate. Use the parameter P to represent the population proportion of people who survive after a stroke. For a hypothesis test of the treatment’s effectiveness, researchers use a null hypothesis of ​p = ​0.85. Pick the correct alternative hypothesis. - The correct alternative hypothesis is p > 0.85 [Show More]

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