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Suppose a study is being planned that w investigate whether female Beagles with severe periodonti...
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Suppose a study is being planned that will investigate whether female Beagles with severe periodontitis (gum and mouth disease) give birth to smaller litters of puppies, on average, than Beagles without periodontitis. Based on previous research, the standard deviation of litter size is estimated to be 2.3 puppies Suppose we suspect that Beagles with periodontitis will give birth to on average 6 puppies whereas Beagles without periodontitis will give birth to on average 5 puppies. a. Using...
Suppose the rating for this type of behavior by the general public has a mean of Mgeneral public and a standard deviation o, and the rating for this type of behavior by a mild sports fan has the same distribution, but a mean of Mmild sports fans. Given this situation, what is the formula for Cohen's d to measure the size of the treatment effect in this study? (umild sports fans - general public) / 02 (Hmild sports fans +...
Aa Aa Tips 4. Factors that influence a hypothesis test Suppose you conduct a hypothesis test about a population mean when the standard deviation is unknown by calculating at statistic and determining whether to reject the null hypothesis. Assume that your statistic is a positive value and that you will reject the null hypothesis when t is very large. For each of the potential changes to the components of your study design or the results listed below, determine the change...
multiple choice: 4) The sampling distribution of x̅1-x̅2 has a mean value equal to . a. 0 b. μ1-μ2 c. N d. Sx̅1- x̅2 True-false questions 5) If we reject H0 one can say the experimental results are significant. 6) By making alpha smaller we can decrease the probability of making a Type I error. 7) As the probability of making a Type I error goes down by making α more stringent, the probability of making a Type II error...
3 Question 3 - Liquor Tax (25 Marks) by the governor to study whether a tax on liquor has decreased average liguor consumption in your state. You are able to obtain, for a sample of individuals selected at random, the difference in liquor consumption (in ounces) for the years before and after the tax. For person i, who is sampled randomly from the population, Y denotes the change in liquor consumption. That these as a rndoma sample from a Normal...
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In part (a) 16.30) Consider a single-factor study wherer 6,05, B-.10, and A 50, and equal treatmert a. What are the required sample sizes ifơ-50, 25, 20? What generalization is suggested b. What are the required sample sizes for the same values of ơ as in part (a) if r-4 all desired by means of the approach in Table B.I by your results? other specifications remaining the same? How do these sample sizes compare with tho...
2. (2 True-False. Just say whether each statement is True or False – no need to justify your answer. 1. If the number of trials in the binomial distribution increases by 1 (and P equals .50), the probability of getting either of the most extreme possible outcomes (that is, 0 or N) is cut in half. 2. If the number of trials in the binomial distribution increases by 1 (and P does not equal .50), the probability of getting either of...
7. A study was conducted to investigate the effectiveness of a new drug for treating Stage 4 AIDS patients. A group of AIDS patients was randomly divided into two groups. One group received the new drug; the other group received a placebo. The difference in mean subsequent survival (those with drugs - those without drugs) was found to be 1.04 years and a 95% confidence interval was found to be 1.04 ± 2.37 years. Based upon this information: Select one...
Suppose you have a new program created that can help people with dyslipidemia improve their lipid profile. You would like to design a randomized clinical trial to evaluate the program's effectiveness by comparing the average change in HDL in patients treated with your program to the average change in patients in a control group. Use data from the control group of a different study (#6, HW #6) to help. The data are displayed in table 2 below. Table 2: HDL...
1. In the simple regression model y = + β1x + u, suppose that E (u) 0. Letting oo-E(u), show that the model can always be rewrit ten with the same slope, but a new intercept and error, where the new error has a zero expected value 2. The data set BWGHT contains data on births to women in the United States. Two variables of interest are the dependent variable, nfan birth weight in ounces (bught), and an explanatory variable,...