Does T-distribution have asymptotic tails?
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Does T-distribution have asymptotic tails?
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- True or False: A partial correlation will always be the same size or greater than a semi-partial correlationSuppose a logistic model has been fitted to a data set and the ROC curve has been plotted. If the point with sensitivity = a and specificity = B is on the curve, what are the smallest and largest values for the area under the curve?Suppose that f(x) = 0.125x for 0 < x < 4 Determine the mean and the variance of X.
- A normal quantile plot of the residuals from this regression model should look like 1. Randomly scattered noise (watermelon seeds) 2. A normal distribution 3. A parabola 4. A uniform distribution 5. A line 6. Symmetric1. Describe the key features of the normal curve and explain why the normal curve in real-life distributions nevermatches the model perfectly.Data can be approximated quite well by a N(3.4, 3.1) model. Economists become alarmed when productivity decreases. According to the normal model what is the probability that the percent change in worker output per hour from the previous quarter is more than 1.6 standard deviations below the mean? What is the probability that the percent change in worker output from the previous quarter is between -1.56 and 4.33?
- Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of 46 male firefighters are tested and that they have a plasma volume sample mean of x = 37.5 ml/kg (milliliters plasma per kilogram body weight). Assume that ? = 7.40 ml/kg for the distribution of blood plasma. (a)Find a 99% confidence interval for the population mean blood plasma volume in male firefighters. What is the margin of error? (Round your answers to two decimal places.) lower limit__ upper limit__ margin of error__ (b)What conditions are necessary for your calculations? (Select all that apply.) A-the distribution of volumes is normal B-the distribution of volumes is uniform C-? is unknown D-? is known E-n is large (c)Interpret your results in the context of this problem. A-The probability that this interval…An insurer insures a risk for which individual claim sizes (in £000s) have mean 500 and standard deviation 250. The insurer arranges excess of loss reinsurance for this risk with a retention limit of £1,000,000. Calculate the proportion of claims from this risk for which the insurer expects to receive a payment from the reinsurer if the loss distribution is: (a) gamma (b) lognormal.Suppose that f (x) = 0.125x for 0 < x < 4 Determine the mean and the variance of X.
- True or False? 1/n∑(Xi − X)^2 is an asymptotically unbiased estimator for the variance of X.What information is provided by r2? What are the primary uses of partial correlations?(On inequal time interval) Obtain the straightline trend equation for the following data by the method of least square. Year : 1989 1991 1992 1993 1994 1995 1998 Sales (in '000 Rs.) : 140 144 160 152 168 176 180 Also, estimate the sales for 1996
