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Testing Claims About Proportions. In Exercises 9–32, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Use the
14. Medical Malpractice In a study of 1228 randomly selected medical malpractice lawsuits, it was found that 856 of them were dropped or dismissed (based on data from the Physicians Insurers Association of America). Use a 0.01 significance level to test the claim that most medical malpractice lawsuits are dropped or dismissed. Should this be comforting to physicians?
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- Point ENTRY CARD Compute the variance of this frequency distribution. Score Number of Students 3. 8 10 4 12 15 Follow the steps given below. Complete the tables shown for each step. Steps 1. Compute the mean by using the Solution Number of formula X=EX Score %3D Students fX 3 8. 10 4 12 15 3 n= 20arrow_forwardAS3. NO3. DATA ANALYSISarrow_forwardSummary statistics for returns on two stocks X and Y are listed below. Stock X Stock Y Mean 2.83% 5.98% Variance 0.006000 0.003000 The covariance of returns on stocks X and Y is 0.001500. Consider a portfolio of 80% stock X and 20% stock Y. What is the mean of portfolio returns? Please specify your answer in decimal terms and round your answer to the nearest thousandth (e.g., enter 12.3 percent as 0.123).arrow_forward
- Part 2 Let x be a random variable that represents the batting average of a professional baseball player. Let y be a random variable that represents the percentage of strikeouts of a professional baseball player. A random sample of n = 6 professional baseball players gave the following information. x 0.338 0.306 0.340 0.248 0.367 0.269 y 3.5 7.7 4.0 8.6 3.1 11.1 Σx = 1.868, Σy = 38, Σx2 = 0.592034, Σy2 = 294.32, Σxy = 11.1556, and r ≈ -0.901. Se ≈ 1.5890, a ≈ 26.420, and b ≈ -64.517. (a) Find the predicted percentage of strikeouts for a player with an x = 0.328 batting average. (Use 2 decimal places.) %(b) Find a 90% confidence interval for y when x = 0.328. (Use 2 decimal places.) lower limit % upper limit %arrow_forwardAnswers for part D and Earrow_forwardFind the variance(2 decimal).arrow_forward
- State or define the following. Also mention their applications Law of iterated expectations Law of total variance i. ii.arrow_forwardPart 4 pleasearrow_forwardWhen data is said to be binomial, this means that ___________. a. They will always be normally distributed b. There are only 2 sets of data c. There are only 2 categories in which a measurement could possibly belong d. The data is classified into 2 or more categoriesarrow_forward
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