margin of error, E, given below where z ce level of 1-a, p is the point estimate for the population proportion, and n is the s a/2 E = Za/21 p(1-P) n ere 354 adults in the survey, so n = eeded. of error for 95% confidence is needed. Common values for Za/2 for various confiden Confidence Level a 90% 95% 99% a 2 0.10 0.05 0.05 0.025 Za/2 1.645 1.960 is the z value correspon 0.01 0.005 2.576 F and the sample proportion was is g to the table, for a 95% confidence level, the necessary value for Za/2

Here are some ratings on a scale of 1-10. Use confidence interval of 99% confidence. What is the confidence interval for the population (mean) ? Ratings are: 8, 7, 3, 10, 4, 4, 8, 8, 7, 8, 3, 8.

جامعۂ بروئ Hniversity of Niwa Son 4 A bag contains 9 red, 10 white and 12 blue balls Find the probability of selecting red dout of ) four balls of same color OA 94*104 12C4 31 12 Ов. 314 9C4*10C4*12C4 31 12 Oc Co. 9C4 , 10C4 , 12C4 OD. 314 31 4 314 OE. None of these (i)3 white and 4 red and 5 blue To hp

Use the information below to answer the PULL STRENGTH questions that follow. Data from "Applied Statistics and Probability for Engineers", Fourth Edition, by Douglas C. Montgomery & George C. Runger. The Excel multiple regression output below is for predicting pull strength from wire length and die height. MULTIPLE REGRESSION EXCEL OUTPUT (PULL STRENGTH) SUMMARY OUTPUT Regression Statistics Multiple R 0.990523843 R Square 0.981137483 Adjusted R Square 0.979422709 Standard Error 2.288046833 Observations 25 ANOVA df S MS Significance F Regression 5990.771221 2995.385611 572.1671503 1.07546E-19 Residual 22 115.1734828 5.235158308 Total 24 6105.944704 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept 2.263791434 1.060066238 2.135518851 0.04409945 0.065348623 4.462234246 Wire Length 2.744269643 0.093523844 29.34299438 3.90691E-19 2.550313062 2.938226225 Die Height 0.012527811 0.002798419 4.476746229 0.000188266 0.006724246 0.018331377

SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? Round answer to nearest whole number.

Submit quiz point(s) possible Construct a 95% confidence interval for H₁₂ with the sample statistics for mean cholesterol content of a hamburger from two fast food chains and confidence interval construction formula below. Assume the populations are approximately normal with unequal variances. Stats =95 mg, s₁ =3.88 mg, n₁ = 19 Confidence interval when variances are not equal (x-2)-1 Ոշ d.f. is the smaller of n₁-1 or n₂-1 Enter the endpoints of the interval. (Round to the nearest integer as needed.) x245 mg. $22.14 mg, n₂ = 12

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SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? > Next Question & *- 3. 6. 5 12 %23

N=991 Mean=11.399 Standard deviation= 13.309