To compare the Neural Presence Factor (measured in Hz) between giant celestial squids andhyperspace foxes, a random sample of 12 squids and 9 foxes are taken and the resulting mea-surements aresquids 38.899 43.652 40.126 42.803 41.848 39.323 42.512 40.06039.780 41.138 41.960 38.648foxes 26.477 22.387 23.574 21.286 22.404 23.984 22.440 24.65123.757(a) Assuming that these measurements come from normal populations, construct a 98% con-fidence interval for the ratio (squids/foxes) of the variances of the Neural Presence Factorsof giant celestial squids and hyperspace foxes. Round your final answers to threedecimal places.(b) Assuming that the measurements come from normal populations with equal but unknownvariances, find a 95% confidence interval for the difference between the means. Roundyour final answers to three decimal places.

Given data: Squids Foxes 38.899 26.477 43.652 22.387 40.126 23.574 42.803 21.286 41.848…

Answered: To compare the Neural Presence Factor…

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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Twenty middle-aged men with glucose readings between 90 milligrams per deciliter and 120 milligrams per deciliter of blood were selected randomly from the population of similar male patients at a large local hospital. Ten of the 20 men were assigned randomly to group A and received a placebo. The other 10 men were assigned to group B and received a new glucose drug. After two months, posttreatment glucose readings were taken for all 20 men and were compared with pretreatment readings. The reduction in glucose level (Pretreatment reading − Posttreatment reading) for each man in the study is shown here. Group A (placebo) reduction (in milligrams per deciliter): 12, 8, 17, 7, 20, 2, 5, 9, 12, 6 Group B (glucose drug) reduction (in milligrams per deciliter): 29, 31, 13, 19, 21, 5, 24, 12, 8, 21 Part A: Do the data provide convincing evidence, at the α = 0.02 level, that the glucose drug is effective in producing a reduction in mean glucose level? Part B: Create and interpret a 98%…
A study indicates that CB radio use speeds up activity in the brain. As part of a randomized crossover study, 36 participants were fitted with a CB radio device on each ear and then underwent two positron emission topography, or PET, scans to measure brain glucose metabolism. During one scan, the CB radios were both turned off. During the other scan, an automated 40- minute muted signal was sent to the radio on the right ear. The order of when the signal was received (for the first or second scan) was randomized. Comparison of the PET scans showed a minor increase in activity in the part of the brain closest to the antenna during the transmission of the automated signal. Was this an observational study or an experiment? Explain why. O The study is an observational study because the reseashers cannot control the response variable during the signal. O The study is an observational study because the researchers only observe values of the response and explanatory variables. O The study is…
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The U.S. Energy Information Administration claimed that U.S. residential customers used an average of 10,941 kilowatt hours (kWh) of electricity this year. A local power company believes that residents in their area use more electricity on average than EIA's reported average. To test their claim, the company chooses a random sample of 115 of their customers and calculates that these customers used an average of 11,425 kWh of electricity last year. Assuming that the population standard deviation is 3217 kWh, is there sufficient evidence to support the power company's claim at the 0.02 level of significance? Step 3 of 3: Draw a conclusion and interpret the decision.
A study was conducted to determine whether big-city and small-town dwellers differed in their helpfulness to strangers. In this study, the investigators rang the doorbells of strangers living in a large City or small towns in the vicinity. They explained they had misplaced the address of a friend living in the neighbourhood and asked to use the phone. The following data show the number of individuals who admitted or did not admit the strangers (the investigators) into their homes: Helpfulness to strangers Admitted strangers into their home Didnot admit strangers into their home Big city dwellers 60 90 Small town dwellers 70 30 State the dependent and independent variable Is this a directional or non directional
Determine the following: Fa Fb Faxb FA0.05 FB0.05 FAXB0.05 CONCLUSION: THANK YOU
A random sample of 160 car accidents are selected and categorized by the age of the driver determined to be at fault. The results are listed below. The age distribution of drivers for the given categories is 18% for the under 26 group, 39% for the 26-45 group, 31% for the 45-65 group, and 12% for the group over 65. Find the rejection region used to test the claim that all ages have crash rates proportional to their number of drivers.
A cat-lover claims that cats are just as smart as dogs. In order to back this claim up with some evidence she organizes a study at a large local pet daycare center. A random sample of 40 cats are selected and a random sample of 40 dogs are selected. Each of the selected animals is given one hour with a trainer in which the trainer attempts to teach them to roll over. Upon conclusion of the training, the proportion of dogs and proportion of cats that have learned this skill is computed. The trainer reports that she is 90% confident that the true difference in the proportion of all dogs and all cats (pD – pC) that can learn this skill with one hour of training is between –0.05 to 0.28. Which of the following conclusions can be made based upon this confidence interval? (A) Because most of the values in the confidence interval are positive, this proves that dogs are smarter than cats. (B) Because the point estimate of the confidence interval is positive, there is convincing evidence…
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A researcher affirms that the average time that students in the morning and afternoon shifts of an elementary school use social networks are the same. Therefore, independent random samples of 15 students from the morning shift and 17 from the afternoon shift are taken and the following times in minutes are observed: Morning 132 131 132 133 134 128 134 132 134 128 132 133 128 132 142 Evening 125 126 126 134 126 129 137 125 129 140 132 123 137 127 133 131 138 Assuming normality in these data, perform: a)A hypothesis test with a significance level of 0.10 for b) The hypothesis test of the researcher's statement with a significance level of 0.10, considering the result of the hypothesis test in the previous section. a
The news release referenced in the previous exercise also included data fromindependent samples of teenage drivers and parents of teenage drivers. In response to aquestion asking if they approved of laws banning the use of cell phones and texting whiledriving, 74% of the teens surveyed and 95% of the parents surveyed said they approved.The sample sizes were not given in the news release, but suppose that 600 teens and 400 parents of teens were surveyed and that these samples are representative of the twopopulations. Do the data provide convincing evidence that the proportion of teens whoapprove of banning cell phone and texting while driving is less than the proportion ofparents of teens who approve?
23. 3 Managers are processing incoming documents. First processes 40% of all documents, 2d processes 35% of all documents, 3d processes 25% of all documents. Probability of 1st manager making an error, while processing a document is 0.04, Probability of 2nd manager making an error, while processing a document is 0.06, Probability of 3rd manager making an error, while processing a document is 0.03. A document is picked up at random. It contains error. Find the probability: a. Document was processed by 1st manager b. Document was processed by 2nd manager c. Document was processed by 3rd manager

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