"Conservationists have despaired over destruction of tropical rain forest by logging,clearing, and burning." These words begin a report on a statistical study of the effectsof logging in Borneo. Here are data on the number of tree species in 12 unloggedforest plots and 9 similar plots logged 8 years earlier:22 18 22 20 15 21 13 13 19 13 19 1517 4 18 14 18 15 15 10 12UnloggedLoggedDoes logging significantly reduce the mean number of species in a plot? Assumeequal population variances and use a = 0.05. Use the difference: logged - unlogged.1. Test Stat:2. Critical Region:a. T> -1.729b. Tabs (-1.729)c. T< -1.729d. T> abs (-1.729)3. Conclusion: At 5% level of significancea. logging reduces the mean number of species in the plotb. there is no evidence that logging reduces the mean number of speciesin the plot

From the provided information, Sample size (n1) = 12 and n2 = 9 Level of significance (α) = 0.05

Answered: "Conservationists have despaired over…

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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The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth‑grade students. Scores on the test range from 00 to 500.500. Demonstrating the ability to use the mean to solve a problem is an example of the skills and knowledge associated with performance at the Basic level. An example of the knowledge and skills associated with the Proficient level is being able to read and interpret a stem‑and‑leaf plot. In 2019, 147,400147,400 eighth‑graders were in the NAEP sample for the mathematics test. The mean mathematics score was ?⎯⎯⎯=282.x¯=282. We want to estimate the mean score ?μ in the population of all eighth‑graders. Consider the NAEP sample as an SRS from a Normal population with standard deviation ?=40. According to the 9595 part of the 68-95-99.768-95-99.7 rule, 95%95% of all values of ?⎯⎯⎯x¯ fall within how many points on either side of the unknown mean ??μ? Give your answer to four decimal places.
1. The maximum number of sit-ups completed by the participants in an exercise class after 1 month of the program is given below. Construct a two-stem stem and leaf plot. 24 31 54 62 36 28 55 18 27 80 37 58 32 37 41 55 39 56 42 29 35 35 2. Find the mean, median, 20% trimmed mean, first quartile, and third quartile for the data in question 3. Show your work for credit. 3. A statistics class has 20 female students and 10 male students. Average exams score for the females is 78.5 and the average exam score for the males is 72.1. What is the average exam score of the entire class?
Answer the following questions. 1. Explain the terms 'classification and tabulation' and point out their importance in a statistical study. Comment on, 'Tabular presentation does not add anything to the information already contained in the data'.
The table below shows the number of state-registered automatic weapons and the murder rate for several states in the U.S. 11.6 8.4 6.7 3.5 2.7 2.7 2.2 0.9 14.1 11.3 9.9 6.8 6.2 6.3 5.8 I = thousands of automatic weapons y = murders per 100,000 residents Keep in mind, the data in the table do not necessarily imply a direct causal link between the two variables. (In fact, can you think of any reasons why these variables may not be directly related to each other?) Also, the purpose of this question is not to make a political statement about guns or gun control. It's only to illustrate that data such as these sometimes have mathematical relationships that can be modeled with linear equations. Those relationships should always be questioned and examined carefully. With that said, these data can be modeled by the equation y = 0.87z + 3.95. Use this equation to answer the following; A) If this model is oconsistent, how many murders per 100,000 residents can be expected in a state with 8.7…
2. Use the first 30 data values in Table 1. Test, at the 5 percent level of significance, the hypothesis that men's and women's mean (a) Cholesterol (b) Blood pressure are equal, Table 1 Student Weight Cholesterol Pressure Gender Student Weight Cholesterol Pressure Gender 147 213 127 30 129 194 184 114 2 156 174 116 M 31 111 104 112 193 110 32 156 191 118 4 127 196 110 F 33 155 221 107 F 144 220 130 34 104 212 111 6. 140 183 99 35 217 221 156 M 119 194 112 36 132 103 204 117 139 200 102 F 37 204 121 9 161 192 121 38 171 191 105 M 10 146 200 125 39 135 183 110 11 190 200 125 M 40 249 227 137 M 12 126 199 133 41 185 188 119 M 13 164 178 130 42 194 200 109 M 14 176 183 136 43 165 197 123 M 15 131 188 112 F 44 121 208 100 16 107 193 113 45 124 218 102 17 116 187 112 46 113 194 119 18 157 181 129 M 47 110 212 119 F 19 186 193 137 48 136 207 99 20 189 205 196 113 M 49 221 219 149 21 147 113 50 151 201 109 F 22 112 211 110 F 51 182 208 130 M 23 209 202 97 M 52 151 192 107 M 24 135 213 103 F…
Suppose researchers at an abdominal transplant clinic are concerned about the rate of graft loss due to diabetes status prior to receiving a donor kidney. Research has shown that gender discordance, or receiving a gender from a donor of an opposite gender may increase the risk of both exposure and outcome after transplant. Assume the following tables represent the stratified analysis of the potential confounding variable. (9 points) Gender Discordance Graft Failure No Graft Failure Total Diabetes II 23 10 33 No Diabetes II 4 44 48 Total 27 54 81 Gender Concordance Graft Failure No Graft Failure Total Diabetes II 9 34 43 No Diabetes II 12 87 99 Total 21 121 142 A) Calculate the stratum specific estimates for the odds ratios in each strata. B) Observe the difference in the odds ratios. Based on observation alone, what are we likely to conclude regarding the relationship between outcome and exposure…
I need help with 7, 8 and 9
11. Give an example of a set of data that satisfies the following conditions. has 8 data bimodal median = 10 mean = 10
Solve the attached problem
11. A manager of a department times how many hours each person works within her department. 43 42 24 50 41 28 47 47 39 59 29 31 39 42 What is the mean and median of the data? Group of answer choices Mean = 40.1; Median = 41.5 Mean = 40.0; Median = 42.5 Mean = 40; Median = 42 Mean = 40.8; Median = 47
Males 74 75 69 72 75 73 88 76 71 64 67 71 72 82 71 83 82 78 80 81 75 Females 75 57 61 71 79 78 81 65 57 80 73 83 86 79 65 70 69 76 55 66 79 5. Construct stem-and-leaf plots for each data set using four stems. You should have two separate plots: one for men and one for women. 6. Why is it important to have the same stems for both plots, even though one plot has an empty stem? 7. Comment on the distributions. What type on conclusions can you make about the heart rates of males and females? Do they appear to be very different?

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