Q2(10). Many scientists are concerned about changes in the ice thickness due toglobal warming. Suppose the historical mean thickness of the ice just off the coast ofBarrow, Alaska, is 3.32 meters. A random sample (n = 28) of the ice thickness nearBarrow during 2008 was obtained. Assume o =2.8 meters, and the underlinedistribution is normal.1(5). Suppose the sample mean ice thickness is 4.036 meters, conduct a hypothesistest to determine whether there is any change in the mean ice thickness. Usea = 0.01.2(5). Find the probability of a type Il error if the true ice mean thickness is 3.0. That isB(3.0).

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Answered: Q2(10). Many scientists are concerned…

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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#5
Q1
Q1. An anthropologist wants to collect data to determine whether the two different cultural groups that occupy an isolated Pacific Island grow to be different heights. The results of his samples of the heights of adult females are as follows Group A n = 120 X1= 62.7 Group B n = 150 X2 = 61.8 $z=2.5 S2 = 2.62 Do these samples constitute enough evidence to reject the null hypothesis that the heights of the two groups are the same? Set alpha to .05. 4. For a significance level of 0.05, what is the critical value? A. to.05 = 1.645 B.to.025 = 1.960 C.Zo.05 = 1.645 D.z0.025 = 1.960 E.None of these
Q1. An anthropologist wants to collect data to determine whether the two different cultural groups that occupy an isolated Pacific Island grow to be different heights. The results of his samples of the heights of adult females are as follows Group A n = 120 X,= 62.7 Sz=2.5 Group B n = 150 X2 = 61.8 S2 = 2.62 Do these samples constitute enough evidence to reject the null hypothesis that the heights of the two groups are the same? Set alpha to .05. 3. What is the value of the test statistic? A. T = 9.20 B.T = 2.86 C.Z = 9.20 D.T = 1.44 E.None of these
#8
Researchers believe that students who study from a screen (e.g., phone, computer) have different grades than students who study from physical pages (e.g., notes). To test this hypothesis, one professor identifies a sample of n = 16 students who study from a screen. They had an average score of M = 72.5 on the final exam. The average for the population of students for the final exam is Mu = 77, σ = 8 and forms a normal distribution. Based on this sample, does the professor have enough evidence to support the researcher’s belief at an α = .05 level? The researcher will use a one-sample z-test. All assumptions have been met.
Q1. An anthropologist wants to collect data to determine whether the two different cultural groups that occupy an isolated Pacific Island grow to be different heights. The results of his samples of the heights of adult females are as follows Group A n = 120 X1= 62.7 Group B n = 150 X2 = 61.8 $z=2.5 S2 = 2.62 Do these samples constitute enough evidence to reject the null hypothesis that the heights of the two groups are the same? Set alpha to .05. 1. What are the appropriate null and alternative hypothesis? A. Ho: H1 – H2 = 0_H;: µ1 – H2 # 0 B. Ho: H1 - H2 2 0 H;: H4- Hz 0 D. Ho: H1 - H2 # 0 H: H1 – Hz = 0 E. None of these.
(Sec. 5.4) Let X denote the courtship time for a randomly selected female-male pair of mating scorpion flies. Suppose the mean value of X is 120 min. and the standard deviation of X is 110 min. (a) Is it plausible that X is normally distributed? Explain why or why not. (b) For a random sample of 55 such pairs, what is the approximate probability that the sample mean courtship time is between 100 min. and 125 min.? (c) For a random sample of 55 such pairs, what is the approximate probability that the total courtship time is greater than 150 hours?
1. Teacher Joy conducted a census in her class and she found out that the average time spent for studying is 2.25 hours, average height is 147 cm, and a random sample of 10 students got an average grade of 87%. Which is the statistic?A. 2.25 hoursB. 10 studentsC. 87%D. 147 cm2.. Suppose the null hypothesis states that the mean is less than or equal to 50 kg and the alternative hypothesis states that the mean is greater than 50 kg. Which of the following would commit Type I error?A. Conclude that µ = 50 kg when the truth is µ > 50 kg.B. Conclude that µ > 50 kg when the truth is µ = 50 kg.C. Conclude that µ = 50 kg when the truth is µ < 50 kg.D. Conclude that µ < 50 kg when the truth is µ = 50 kg.3. What variable can the researcher freely manipulate in a study?A. dependent variableB. independent variableC. both the independent and dependent variableD. neither the independent nor the dependent variable
A population of values has a normal distribution with μ=204.6μ=204.6 and σ=17σ=17. You intend to draw a random sample of size n=92n=92.Find P67, which is the score separating the bottom 67% scores from the top 33% scores.P67 (for single values) = IncorrectFind P67, which is the mean separating the bottom 67% means from the top 33% means.P67 (for sample means) = Enter your answers as numbers accurate to 1 decimal place. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
Q1. An anthropologist wants to collect data to determine whether the two different cultural groups that occupy an isolated Pacific Island grow to be different heights. The results of his samples of the heights of adult females are as follows Group A n = 120 X,= 62.7 Group B n = 150 X, = 61.8 S1= 2.5 S2 = 2.62 Do these samples constitute enough evidence to reject the null hypothesis that the heights of the two groups are the same? Set alpha to .05. What are the appropriate null and alternative hypothesis? A. Ho: H1- H2 = 0 H;: H1 - H2 * 0 B. Ho: H1- H2 N0 H: H-H2 0 D. Ho: H1 - H2 # 0 H: H- H2 = 0 E. None of these. 2. What is the Test statistics? A.T = X-9-Do B. Z = -9-Do C. T = -9-Do D-Do D.T = E. Z = -9-Do 1, 1 SD 1 ni'n2 n1 n2 zu Tu 3. What is the value of the test statistic? A. T = 9.20 B.T = 2.86 C.Z = 9.20 D.T = 1.44 E.None of these A TOSHIBA F6 F10 F11 F12 SNI YJU
A population of values has a normal distribution with μ=248.4μ=248.4 and σ=23.6σ=23.6. You intend to draw a random sample of size n=32n=32.Find P18, which is the score separating the bottom 18% scores from the top 82% scores.P18 (for single values) = Find P18, which is the mean separating the bottom 18% means from the top 82% means.P18 (for sample means) = Enter your answers as numbers accurate to 1 decimal place.************NOTE************ round your answer to ONE digit after the decimal point! ***********Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.

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