Stress is applied to a 20-in. Steel bar that is clamped in a fixed position at each end. Let Y be = 10 and Var(Y) = 100/7. the distance from the left end at which the bar snaps with E(Y) suppose U = Y/20 has a standard beta distribution: f(u; a, ß): = r(a+ß) α-1 น Γ(α)Γ(β) (1 −u)³-¹; 0 12). (d) Compute the probability that the bar snaps more or less than 2 in. from where you expect it to.
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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.obtain the MVB estimator for u in normal population №.(482), where 2 is knowCalculate correlation coefficient from the following results : N 10 ΣΧ 100 ΣΥ- 150 E(X-10}²= 180, 2(Y-15)' = 215 E(X-10(Y-15) = 60. %3D
- 10. Suppose x = Exp(2). Show solution to answer the following: a) Use MGF technique to determine the distribution of Y = 10 X. b) Use CDF technique to determine the distribution of v = 5x- 4. c) Use the method of transformation to derive the PDF of w = 2-5 X.Calculate correlation coefficient from the following information: N= 10, ΣX= 140, ΣΥ= 150, Σ(Χ- 10) -180, Σ(Υ-15)? 215, E(X – 10) (Y – 15) = 60. %3DAn engineer in charge of a production process that produces a stain for outdoor decks has designed a study to test the research hypotheses that an additive to the stain will produce an increase in the ability of the stain to resist water absorption. The mean absorption rate of the stain without the additive is 40 units. The engineer places that stain with the additive on n=50 pieces of decking material and records y- = 36.5 and s = 13.1. Let u denote the mean absorption rate of the stain. You must state the null and the alternative hypotheses.
- 3. a. B (0.25, 0.75) Evaluate using Beta Function:Find x in ΔPQR.An experiment to compare the tension bond strength of polymer latex modified mortar (Portland cement mortar to which polymer latex emulsións have been added during mixing) to that of unmodified mortar resulted in x = 18.11 kgf/cm2 for the modified mortar (m = 42) and y = 16.88 kgf/cm2 for the unmodified mortar (n = 31). Let ₁ and ₂ be the true average tension bond strengths for the modified and unmodified mortars, respectively. Assume that the bond strength distributions are both normal. (a) Assuming that o₁ = 1.6 and ₂ = 1.3, test Ho: ₁ - ₂ = 0 versus H₂: H₁ - H₂> 0 at level 0.01. Calculate the test statistic and determine the P-value. (Round your test statistic to two decimal places and your P-value to four decimal places.) Z = P-value = State the conclusion in the problem context. O Fail to reject Ho. The data suggests that the difference in average tension bond strengths exceeds 0. Fail to reject Ho. The data does not suggest that the difference in average tension bond strengths…
- 5. The revenue (Y) for 1,000 food producing establishments in a country may be described by an exponential distribution with parameter 2 = 1/(12*10°), use seed=1999. a. Generate the 1000 revenues and retain the integer portion. Obtain a histogram for the data in (a). b. c. Select a simple random sample of size 30 from this population (use seed 2008). = d. Using this sample, estimate the average and total revenue and the associated variance estimates. e. Construct 95% confidence intervals for the mean and total revenue of the population. f. For this type of distribution, why is a simple random sampling not the best design to yield a precise estimate? Suppose there was an auxiliary information prior to the sampling design, propose an alternate sampling design that can lead to a more precise estimate. Explain how you could do this.2. Consider a gas station's daily sales. Let Y be the volume of gas sold per day in 1000s of gallons. Assume the distribution of Y follows this pdf: y 1sxs2 S (v)=. else17.7 Butterfly wings. Researchers studied the morphological attributes of monarch butterflies (Danaus plexippus), a species that undertakes large seasonal migrations over North America. They measured the forewing weight (in milligrams, mg) of a sample of 92 monarch butterflies, all of which had been reared in captivity in identical conditions.° Figure 17.4 shows the output from the statistical software JMP. (The data are also available in the Large.Butterfly the data file if you wish to practice working with your own software.) Estimate with 95% confidence the mean forewing weight of monarch butterflies reared in captivity. Follow the four- step process as illustrated in Example 17.2. 4 STEP そMP FWweight 30 25 20 15 10 11 12 13 14 15 8 9 10 Summary Statistics Mean 11.795652 Std Dev 1.1759413 Std Err Mean 0.1226004 Upper 95% Mean Lower 95% Mean 1 FIGURE 17.4 Software output (JMP) for the forewing weight of monarch 12.039183 11.552122 92 N. butterflies. Count