Refer to Exercise 8.S.6. Analyze these data using a Wilcoxon signed-rank test. 8.S.6 Blologists noticed that some stream fiIshes are most often found inpools, which are deep, slow-moving parts of the stream, while othersprefer riffles, which are shallow, fast-moving regions. To investigatewhether these two habitats support equal levels of diversity (i.e., equalnumbers of species), they captured fish at 15 locations along a river. Ateach location, they recorded the number of species captured in a riffle andthe number captured in an adjacent pool. The following table contains thedata.1 Construct a 90% confidence interval for the difference in meandiversity between the types of habitats.LocationPoolRiffleDifference16336333334844262276248729.1211032114311254134114215431Mean4.72.52.2

Answered: Image /qna-images/answer/e1297b69-178d-4f5e-9ad6-548935eb7c46.jpg

Answered: 8.S.6 Biologists noticed that some…

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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4. The STATA output below uses the Educational Attainment and Wage Equations (EAWE) data similar to what we have investigated in class: reg EARNINGS S FEMALE ASVABC ETHHISP ETHWHITE MARRIED EXP TENURE 500 Source | df Number of obs SS MS omitted F (8, 491) Model | 11567.0578 8. omitted Prob > F omitted omitted Residual 55379.8233 491 R-squared Adj R-squared 0.1728 0.1593 Total | 10.62 66946.8811 499 134.162086 Root MSE P> |t| EARNINGS | Std. Err. [95% Conf. Interval] Coef. 5.13 1.282268 .2499762 0.000 .7911128 1.773423 0.012 -.5480824 3.428481 FEMALE | ASVABC | -2.457466 .9717918 -2.53 -4.36685 2.206915 .6217233 3.55 0.000 .9853484 1.985396 0.685 3.094036 ETHHISP -.8068838 -0.41 -4.707804 ETHWHITE | MARRIED | 1.670643 -0.98 0.329 -1.63153 -4.91402 1.650961 1.720857 .9850864 1.75 0.081 -.2146475 3.656362 . 4396207 EXP | 3.99 .8659335 .2169744 0.000 1.292246 .3597575 .1895722 1.90 0.058 -.0127153 .7322303 TENURE -6.210424 2.704951 4.537532 -1.37 0.172 -15.1258 cons
Your company manufactures plastic wrap for food storage. The tear resistance of the wrap, denoted by X, must be controlled so that the wrap can be torn off the roll without too much effort but it does not tear too easily when in use. In a series of tests (see data table below), 15 rolls of wrap are made under carefully controlled conditions and the tear resistance of each roll is measured. The results are used as the basis of a quality assurance specification. If X for a subsequently produced roll falls more than two standard deviations away from the test period average, the process is declared out of specification and production is suspended for routine maintenance. Roll 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 X 134 131 129 133 135 131 134 130 131 136 129 130 133 130 133 Write an Excel spreadsheet to calculate the sample mean and sample standard deviations. The {#1} {#2} a)What…
A study of parental empathy for sensitivity cues and baby temperament (higher scores mean more empathy) was performed. Let x1 be a random variable that represents the score of a mother on an empathy test (as regards her baby). Let x2 be the empathy score of a father. A random sample of 30 mothers gave a sample mean of x, = 67.85. Another random sample of 25 fathers gave x2 = 61.72. Assume that o, = 10.85 and oz = 10.57. (a) Let µ̟ be the population mean of x, and let uz be the population mean of x2. Find a 90% confidence interval for H1 - H2. (Use 2 decimal places.) lower limit upper limit
The following data show the pattern of results that was obtained in a study by Liguori and Robinson (2001) examining how different levels of alcohol and caffeine consumption influenced response time in a simulated driving test. The means show the average response time in milliseconds for different combinations of alcohol and caffeine. Remember larger reaction time means someone is slower to respond. For these data, indicate which are true/false There is an interaction, caffeine has a larger impact on reaction times (makes people respond faster) when participants haven’t had alcohol) A. True B. False
23. To test whether arousal or stress levels increase as the difficulty of a task increases, 24 participants (n = 8; N= 24) were randomly assigned to complete an easy, typical, or difficult task. Their galvanic skin response (GSR) was recorded. A GSR measures the electrical signals of the skin in units called microSiemens (µS), with higher signals indicating greater arousal or stress. The data for each task are given in the table. easy typical difficult 2.6 5.6 9.0 3.9 4.5 5.6 3.4 3.7 3.5 1.2 2.0 7.8 2.1 3.3 6.4 1.2 4.6 7.5 1.8 3.1 4.4 2.2 2.0 3.8 1. complete the F table and make a decision to retain or reject the null hypothesis 2. compute Turkeys HSD post hoc test and interpret the results.
A researcher wants to test if the average performance of a new teaching method is different from the traditional teaching method in a sample of 25 students. The researcher used the Wilcoxon Signed-Ranks Test and obtained a T-value of 43. What can be concluded from the test result?
2. Two suppliers manufacture a plastic gear used in a laser printer. The impact of these gears measured in foot-pounds is an important characteristic. Assume the impact strength from both suppliers are independent of each other and normally distributed. A random sample of 10 gears from supplier 1 results in T1 = 289.3 and s = (35.5)². Another sample of 16 gears from supplier 2 results in 2 321.5 and s = (21.1)². Supplier 2 claims to provide gears with higher mean impact strength than supplier 1. (a) from two suppliers have the same impact strength variance. Use a F test with a = 0.1 to determine whether the plastic gears (b) Determine whether the claim of supplier 2 is correct. Use a = 0.05.
A study was done comparing the effectiveness of exercise vs medication on loweringblood pressure in patients with high blood pressure. Two hundred subjects wererandomly assigned to two groups. One group was instructed to exercise according tostrict schedule, and the other group was given medication to take. After 3 months,the researchers compared the change in blood pressure between the groups and foundthat the exercise groups experienced a greater drop in blood pressure on average.a. Is this an observational study or an experimental study?b. Explain why a blind study would be difficult to do in this situation.
A) In the screenshot i provided B) Does either explanatory variable improve the fit of the model that uses the other? Use a test statistic for each. Use α=0.05.
The authors of a paper classified characters who were depicted smoking in movies released between a certain range of years. The smoking characters were classified according to sex and whether the character type was positive, negative, or neutral. The resulting data are summarized in the accompanying table. Assume that it is reasonable to consider this sample of smoking movie characters as representative of smoking movie characters. Do the data provide evidence an association between sex and character type for movie characters who smoke? Use α = 0.05. Sex = Male Female Positive Negative Neutral 256 Character Type 85 107 11 132 51 Calculate the test statistic. (Round your answer to two decimal places.) x² Use technology to calculate the P-value. (Round your answer to four decimal places.) P-value = What can you conclude? O Reject Ho. There is convincing evidence to conclude that there is an association between sex and character type for movie characters who smoke. Fail to reject Ho.…
A Chi square test has been conducted to assess the relationship between marital status and church attendance. The obtained Chi square is 7.45 and the critical Chi square is 9.488. What may be concluded? Group of answer choices A.reject the null hypothesis, church attendance and marital status are independent B.fail to reject the null hypothesis, church attendance and marital status are independent C.Reject the null hypothesis, church attendance and marital status are dependent D.fail to reject the null hypothesis, church attendance and marital status are dependent
There is some research indicating that college students who use Facebook while studying tend to have lower grades than non-users (Kirschner & Karpinski, 2010). A representative study surveys students to determine the amount of Facebook use during the time they are studying or doing homework. Based on the amount of time spent on Facebook, students are classified into three groups and their grade point averages are recorded. The following data show the typical pattern of results.Non - User Rarely Use Regularly Use 3.7 3.51 3.02 3.45 3.42 2.84 2.98 3.81 3.42 3.94 3.15 3.1 3.82 3.64 2.74 3.68 3.2 3.22 3.9 2.95 2.58 4 3.55 3.07 3.75 3.92 3.31 3.88 3.45…

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