18.24 part A please! (a) Use the data in Exercise 18.22 to give a 95%confidence interval for the difference in mean weightchange after 15 weeks for obese children who receiveprofessional food counseling and obese children who do18.24 Food counseling for obese children,change after 15 weeks for obese children who receive(b) Give a 95% confidence interval for the mean weightcontinued.....aprofessionalnot.aprofessional food counseling.Bird sonce COMPARING TWO MEANS124 126 116 127 119 97 102 110 120 103 115111 107 100 107 115 111 97 112 104 106 113109 113 128 128 118 113 124 127 136 106 123466CHAPTER EIGHTEEN(a) Treat these data as SRSS from the population of adultlong-tailed finches in the wild. Make dotplots of both datasets and determine whether the use of a two-sample tprocedure is appropriate.test scores of 31 seventh-grade girls in a midwestern schdistrict:19114 100 104 89 102 91 114 114 103 10572(b) How much longer, on average, are the central tailfeathers of male long-tailed finches than those of thefemales? Give a 95% confidence interval for the differencein population mean length between the male and thefemale adult long-tailed finches.108 130 120 132 111 128 118 119 86111 103 74 112 107 103 98 96 112 112 0.The IQ test scores of 47 seventh-grade boys in the same18.22 Food counseling for obese children.According to the Centers for Disease Control andPrevention (CDC), obesity rates among U.S. childrenhave increased dramatically over the past three decades,from a low of about 5% to 18% as of 2010. A studyexamined the effect of family-based food-counselingsessions provided by trained professionals. The studyrandomly assigned obese children aged 9 to 12 years toeither the counseling intervention or a control group notreceiving any food counseling. The children's weightchanges (in pounds, lb) after 15 weeks are displayed inTable 18.3 for both conditions. 18district are as follows:93 123 79 119 110 110 107 105 105 110 7790 114 106(a) Plot both data sets using dotplots or histograms.Because the sample sizes are quite large, the t procedureswill work well even in the presence of skew or mildoutliers.(a) Make dotplots or histograms of both sets of data.Because the distributions are reasonably symmetricwith no extreme outliers, the t procedures will workwell.(b) Is there good evidence that obese children receivingfood counseling gain less weight over a 15-week period?State the hypotheses, carry out the corresponding test, andconclude in context.(b) Treat these data as SRSS from all seventh-gradestudents in the district. Is there good evidence that girlsand boys differ in their mean IQ scores?> TABLE 18.3 Weight change (Ib) of obese children, by groupIntervention-16.7-14.8-11.9-9.7-9.6-8.8-8.0-7.1-6.6-6.0-5.6-5.6-5.5-5.5-5.1-5.0-5.0-4.8-4.4-4.4-4.1-4.0-4.0-3.6-3.5-3.2 -2.8-2.0-1.8-1.8-1.4-1.2-0.2-0.10.00.20.61.01.21.21.41.82.02.22.52.83.34.25.45.86.06.48.4Control12.010.09.08.67.16.76.14.84.64.52.82.82.82.71.81.6 1.00.70.40.10.1-5.1-5.1

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Answered: (b) Give a 95% confidence interval for…

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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A research group studying cell phone habits asked the question “Do you ever use your cell phone to make a payment at a convenience store?” to people selected from two random samples of cell phone users. One sample consisted of older adults, ages 35 years and older, and the other sample consisted of younger adults, ages 18 years to 34 years. The proportion of people who answered yes in each sample was used to create a 95 percent confidence interval of (0.097,0.125)(0.097,0.125) to estimate the difference (younger minus older) between the population proportions of people who would answer yes to the question. Which of the following is the best description of what is meant by 95 percent confidence? In repeated random sampling with the same sample size, approximately 95% of the sample proportions from the younger group will be between 0.097 and 0.125 greater than the sample proportion from the older group. A In repeated random sampling with the same sample size,…
Refer to the accompanying data set of mean drive-through service times at dinner in seconds at two fast food restaurants. Construct a 90% confidence interval estimate of the mean drive-through service time for Restaurant X at dinner; then do the same for Restaurant Y. Compare the results.Construct a 90% confidence interval of the mean drive-through service times at dinner for Restaurant X. Service Times (seconds) Restaurant X Restaurant Y 83 120 120 147 263 100 125 154 117 172 184 125 153 164 212 137 112 125 130 127 338 310 180 115 158 138 138 230 216 295 143 101 232 237 184 122 99 133 240 142 150 200 173 121 65 140 201 153 143 138 197 175 120 139 176 143 155 138 167 138 184 202 230 190 357 237 239 249 231 238 306 210 193 182 185 170 86 102 54 169 105 145 180 157 175 76 142 147…
Would you guess that people tend to buy more jeans when the weather iswarm or when it is cold? The following table shows the number of jeans (in thousands of pairs)sold in the United Kingdom in January and June for the years 1980-1985. Construct a 90%confidence interval for the difference, on average, of the number of jeans that are sold indifferent seasons each year. Year 1980. 1981. 1982. 1983. 1984. 1985Jan. 1998. 1924. 1969. 2149. 2319. 2137 June 2286 1979 2375 2369 3126 2117
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Refer to the accompanying data set of mean drive-through service times at dinner in seconds at two fast food restaurants. Construct a 99% confidence interval estimate of the mean drive-through service time for Restaurant X at dinner; then do the same for Restaurant Y. Compare the results. Construct a 99% confidence interval of the mean drive-through service times at dinner for Restaurant X. _sec<μ< _sec Service Times (seconds) Restaurant X Restaurant Y 87 122 121 145 270 103 130 149 116 176 185 121 154 164 210 134 107 119 125 127 337 313 172 113 159 134 137 231 217 291 148 93 233 242 185 128 98 140 244 146 157 203 171 119 61 142 205 148 146 132 201 178 115 146 173 150 153 135 171 130 191 194 230 195 356 242 234 253 237 234 308 213 195 178 190 167 8787 107 54 176 108 144 177…
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