X is a normally distributed random variable with unknown µ and anunknown variance, o². X and s² are the unbiased, sample mean andsample variance estimates of u and o respectively. Which statementsabout X and s are correct?X = µQ6.I.II. E(X) = µ II. s² = o? IV.E(s²) = o²A. II. & IV. only B.II. & IV. only C. I. & II. only. D. All of them.O A. AВ. ВС. СO D. D

Answered: Image /qna-images/answer/088c80dc-a59c-49c5-aff6-3d1eb8ff2ff3.jpg

Answered: 5. X is a normally distributed random…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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13. The following table shows summary data on mercury concentration in salmons (in ppm) from two different areas of the Pacific Ocean. Area 1: m = 15, x = 0.0860, s₁ = 0.0032 Area 2: n = 15, y = 0.0884, s₁= 0.0028 Do the data suggest that the mercury concentration is higher in salmons from Area 2? Assume equal variance and use a = 0.05.
A pet association claims that the mean annual cost of food for dogs and cats are the same. The results for samples for the two types of pets are shown below. At x = 0.01, can you reject the pet association's claim? Assume the population variances are not equal. Assume the samples are random and independent, and the populations are normally distributed. Complete parts (a) through (e) below. Dogs Cats X₁ = $244 x2 = $209 S1 = $37 S2 = $33 n₁ = 15 n₂ = 9 (a) Identify the claim and state Hō and Ha. Which is the correct claim below? A. "The mean annual costs of food for dogs and cats are equal." B. "The mean annual costs of food for dogs and cats are not equal." C. "The mean annual cost of food for cats is greater than the cost for dogs." D. "The mean annual cost of food for dogs is greater than the cost for cats."
nsecticde ion between the proportions of ne two chemicals the 1nsecticides. 6.38 For a sheet-metal stamping machine in a certain factory, the time between failures, X, has a mean time between failure (MTBF) of 56 hours and a variance of 16 hours. The repair time, Y, has a mean time to repair (MTTR) of 5 hours and a variance of 4 hours. If X and Y are independent, find the expected value and the variance of Z = X + Y, which represents one operation-repair cycle. 11
Suppose x values are: 0, 1, 2, 3, p(x) = 0.46, 0.28, 0.14, 0.12 and u= 0.92 Compute the variance for x values. 3D0.46,0.28, 0.14, 0.12 and %3D
The table below shows the number of hours per day 11 patients suffered from headaches before and after 7 weeks of soft tissue therapy. At a = 0.01, is there enough evidence to conclude that soft tissue therapy helps to reduce the length of time patients suffer from headaches? Assume the samples are random and dependent, and the population is normally distributed. Complete parts (a) through (). Patient Daily headache hours (before) 2.9 3.2 3.4 1.8 Dally headache hours (after) 1 2 3 4 5 10 11 P 3.8 2.5 1.8 3.3 3.8 1.2 2.9 4.3 6 7 8 9 4.4 1.8 1.7 3.6 2.2 1.1 1.1 1.4 3.5 2.2 (a) Identify the claim and state Ha and H The claim is "The therapy helps to reduce the length of time patients suffer from headaches." Let Ha be the hypothesized mean of the patients' daily headache hours before therapy minus their daily headache hours after it. State Ho and H. Choose the correct answer below. OA. Ho: H sd B. Họ: H s0 OC. Họ: Had H: >0 OD. Ho: Ha20 R= Prt:"H OE Ho: Ha =d OF. Ho: Hg zd p> PH :"H (b)…
2 questions Are the data sufficient to indicate a significant change in cholesterol level? Test with α = .05. 2. Compute r2, the percentage of variance accounted for by the treatment, to measure the size of the treatment.
I want 100% accurate answer and please handwritten
Let x represent the average annual salary of college and university professors (in thousands of dollars) in the United States. For all colleges and universities in the United States, the population variance of x is approximately ?2 = 47.1. However, a random sample of 18 colleges and universities in Kansas showed that x has a sample variance s2 = 86.1. Use a 5% level of significance to test the claim that the variance for colleges and universities in Kansas is greater than 47.1. Find a 95% confidence interval for the population variance. ased on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Since the P-value > ?, we fail to reject the null hypothesis.Since the P-value > ?, we reject the null hypothesis. Since the P-value ≤ ?, we reject the null hypothesis.Since the P-value ≤ ?, we fail to reject the null hypothesis. (e) Interpret your conclusion in the context of the application. At the 5% level of significance, there is insufficient…
What is the Discrete Variable Variance for the following numbers:x = 0 and P(X = x) = 0.19x = 1 and P(X = x) = 0.27x = 2 and P(X = x) = 0.21x = 3 and P(X = x) = 0.33
A2
I need help with this question.
2. Let X - tp. Verify the mean and variance formulas. (Hint: Let X = p/2UV-1/2.)

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