IF it was XG (23) Independent of Xen G (13) Find Miley D-Probability density Function of the Variable YaX+Xq 2 -the Mean variance of the variable
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- Respiratory Rate Researchers have found that the 95 th percentile the value at which 95% of the data are at or below for respiratory rates in breath per minute during the first 3 years of infancy are given by y=101.82411-0.0125995x+0.00013401x2 for awake infants and y=101.72858-0.0139928x+0.00017646x2 for sleeping infants, where x is the age in months. Source: Pediatrics. a. What is the domain for each function? b. For each respiratory rate, is the rate decreasing or increasing over the first 3 years of life? Hint: Is the graph of the quadratic in the exponent opening upward or downward? Where is the vertex? c. Verify your answer to part b using a graphing calculator. d. For a 1- year-old infant in the 95 th percentile, how much higher is the walking respiratory rate then the sleeping respiratory rate? e. f.Suppose that f(x) = 0.125x for 0 < x < 4 Determine the mean and the variance of X.If a dealer’s profit, in units of $5000, on a new automobile can be looked upon as a random variable X having the density function Find the variance of X.
- True or False? 1/n∑(Xi − X)^2 is an asymptotically unbiased estimator for the variance of X.The relationship between body mass index (BMI) and systolic blood pressure in males 50 years of age is investigated. A random sample of n = 13 males is selected and their BMI and systolic blood pressures are measured. Let X be the body mass index (BMI) and Y the systolic blood pressure of males, 50 years of age. Given: The average and variance of the BMI is X = 26 and Var(X) = 15.026. The average and variance of the systolic blood pressure is Y = 126 and Var(Y) = 423. The covariance between X and Y is Cov(X,Y) = 69.87. For the estimated regression equation Y = Bo + B, X, it was found that B1 = 4.65.