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- Engineers are interested in comparing the mean hydrogen production rates per day for three different heliostat sizes. From the past week’s records, the engineers obtained the amount of hydrogen produced per day for each of the three heliostat sizes. That they computed and compared the sample means, which showed that the mean production rate per day increased with heliostat sizes. a. Identify the type of study described here. b. Discuss the types of interference that can and cannot be drawn from this study.for a given disease gene, specified mode of inheritance, and observed data set, if the p-value for a chi-square goodness of fit analysis is 0.01, then we: a) reject the null hypothesis at the 0.0001 level. b) reject the null hypothesis that the disease does not follow the specified mode of inheritance at the given gene. c) accept the null hypothesis that the disease almost certainly follows the specified mode of inheritance at the given gene. d) reject the null hypothesis that the disease follows the specified mode of inheritance at the given gene. e) cannot answer the question.An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 250 engines and the mean pressure was 6.8pounds/square inch (psi). Assume the population variance is 0.810.81. If the valve was designed to produce a mean pressure of 6.7 psi, is there sufficient evidence at the 0.1 level that the valve performs above the specifications? Step 1 of 6: State the null and alternative hypotheses. Step 2 of 6: Find the value of the test statistic. Round your answer to two decimal places. Step 3 of 6: Specify if the test is one-tailed or two-tailed. Step 4 of 6: Find the P-value of the test statistic. Round your answer to four decimal places. Step 5 of 6: Identify the level of significance for the hypothesis test. Step 6 of 6: Make the decision to reject or fail to reject the null hypothesis.
- Engineers are interested in comparing the mean hydrogen production rates per day for three different heliostat sizes. From the past week’s records, the engineers obtained the amount of hydrogen produced per day for each of the three heliostat sizes. That they computed and compared the sample means, which showed that the mean production rate per day increased with heliostat sizes Identify the type of study described here. Discuss the types of interference that can and cannot be drawn from this study.Which of the following is not a requirement for consideration before continuing with the calculation of a sample size in an observational study observing the difference in incidence of disease X based on exposure? Projected drop-out rate to inflate the sample size estimate based on the projected loss to follow-up in a study A predetermined power for the study to detect a difference when one actually exists The correlation coefficient between the two groups being compared. The informed estimation of the incidence in both groups being comparedCan you explain what it means for a coefficient to be "consistently estimated" in a first difference equation? Aftering differencing, im left with alpha2, gamma2*female and Beta coefficients. Can time invariant coefficients be consistently esimtated in a differenced equation? Do the coefficients in the differenced equation represent the same thing as if it were a simple cross-sectional model, only within the same time period? (see attached image)
- Let x = age in years of a rural Quebec woman at the time of her first marriage. In the year 1941, the population variance of x was approximately σ2 = 5.1. Suppose a recent study of age at first marriage for a random sample of 51 women in rural Quebec gave a sample variance s2 = 2.3. Use a 5% level of significance to test the claim that the current variance is less than 5.1. Find a 90% confidence interval for the population variance. (b) Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.) What are the degrees of freedom? (f) Find the requested confidence interval for the population variance. (Round your answers to two decimal places.) lower limit upper limit Interpret the results in the context of the application. We are 90% confident that σ2 lies within this interval.We are 90% confident that σ2 lies above this interval. We are 90% confident that σ2 lies outside this interval.We are 90% confident that σ2 lies…The IE Dept. is interested in the mean age of a certain population. A random sample of 10 individuals drawn from the population has a mean of 27. Assuming that the population is approximately normally distributed with variance 20, can we conclude that the mean is less than 30 years ? (α=0.10) . What is the critical region? -1.28 -1.645 -1.96 -2.33Let x = age in years of a rural Quebec woman at the time of her first marriage. In the year 1941, the population variance of x was approximately σ2 = 5.1. Suppose a recent study of age at first marriage for a random sample of 41 women in rural Quebec gave a sample variance s2 = 3.3. Use a 5% level of significance to test the claim that the current variance is less than 5.1. Find a 90% confidence interval for the population variance. (f) Find the requested confidence interval for the population variance. (Round your answers to two decimal places.) lower limit upper limit (b) Find the value of the chi-square statistic for the sample. (Round your answer to two decimal places.) What are the degrees of freedom?
