You want to see if the rat population is changingin New York City. You know the population countmay change with the season and time of day.Your plan is to compare one date in one year tothe same date another year, doing a count insubway stations for one hour at the same timeeach day for two weeks to average out weathereffects. You don't have time to wait multipleyears so have to come to a conclusion based ontwo years. The counts are as follows:Year 1: 8, 2, 58, 14, 2, 15, 38, 4, 18, 13, 31, 32, 7, 1Year 2: 7, 65, 17, 20, 66, 33, 18, 5, 33, 33, 3, 80,59, 11Are these two populations different at the 95%confidence level?If you repeated a day of counting on year 2, whatwould be the probability of seeing 100 rats?

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Answered: You want to see if the rat population…

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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You notice that after 6 days, approximately 29 of your employees will be sick and not able to work. You have a huge order you need to fulfill within the next two weeks. Because of this, you want to continue collecting data to determine how many people will have been infected by Day 15. The data for Days 1-15 in the table below. Day Number of initially infected people Number of newly infected people 1 о 1 2 Total number of infected people ) 2 3 2 2 4 4 4 4 8 5 8 8 16 6 lb 13 29 29 14 43 8 43 19 62 9 62 16 79 10 78 " 89 11 89 4 93 12 93 2 95 13 95 2 97 14 97 I 98 15 98 99
A researcher wants to know how long it takes, on average, for a certain species of bacteria to divide. She watches 17 cells through a microscope and times how long it takes them to divide. She obtains the following data, in hours: 8.1, 7.6, 7.7, 8.3, 8.5, 7.9, 8.1, 8.2, 8.2, 7.9, 8.6, 8, 7.9, 8.5, 8.2, 8.2, 8 Assuming the population standard deviation is o = average time it takes this species of bacteria to divide. 0.3, construct a 93% confidence interval for the Za 2 Margin of Error: E = We are 93% confident that this species of bacteria takes, on average, between hours and hours to divide. ||
Ms. Eisenman wanted to know her average student’s score on the most recent chapter test and what proportion of her 108 students scored an A or a B on the test. The average score of the 108 students on the test was 78.58 and 73 of the 108 students scored an A or a B on the test. Which of the following is the correct representation of the average grade and the proportion of students that scored an A or a B on the test? A. μ = 78.58 and p = 0.676, both are parameters. B. μ = 78.58 and p-hat=0.676 the average is a parameter but the proportion is a statistic. C. x-bar=.7858 and p = 0.676, the average is a statistic but the proportion is a parameter. D. x-bar= .7858 and p-hat=0.676 , both are statistics.
4. In a study of modeling, one group of 20 children saw an adult acting aggres- sively on videotape. Another group of 20 children saw the same adult acting aggressively in real life. Later, each child was placed in a room where he or she was given the opportunity to behave aggressively toward a Bobo doll (a humanlike dummy). The researchers recorded the number of aggressive acts toward the Bobo doll by each child in a 15-minute period. Here are the results: Real-Life Model Video Model X f f 37 1 25 1 35 23 3 34 3 22 30 21 5 27 4 19 4 22 18 19 17 18 3 10 Compare the two groups in terms of the aggressiveness displayed. If you re- ject the null hypothesis, tell what it means in the context of the problem. 1 5. A group of 10 navy pilots iş first trainod
A researcher wants to know how long it takes, on average, for a certain species of bacteria to divide. She watches 15 cells through a microscope and times how long it takes them to divide. She obtains the following data, in hours: 6.3, 7.1, 8.7, 6.1,7.4, 7.5, 6.4, 7.8, 7.5, 4.4, 6.1, 7.1, 5.9, 5.9, 7.6 Construct a 95% confidence interval for the average time it takes this species of bacteria to divide. 6.787 1.0155 1.0155 te %3D 0.025 Margine of Error: E = 47.0947 We are 95% confident that this species of bacteria takes, on average, between hours to divide. hours and Question Help: D Post to forum
The managers of a brokerage firm are interested in finding out if the number of new clients a broker brings into the firm affects the sales generated by the broker. For the last year, the managers sampled 16 brokers and determined the number of new clients they enrolled during that year and their sales amounts in millions of dollars for that year. This data is presented in the table that follows. In your answers, sales should be left as a decimal as in the data table. It is not necessary to multiply by one million dollars. Perform a simple linear regression analysis of this data and answer the following questions. Suggestion: Read all of the questions before doing any analysis. Broker New Clients Sales 1 27 5.32 2 11 3.44 3 42 7.96 4 33 6.62 5 15 4.06 6 15 3.16 7 25 4.9 8 36 6.84 9 28 5.8 10 30 5.84 11 17 3.56 12 22 4.58 13 18 3.7 14 24 5.34 15 35 6.9…
You get a job as the manager of a popular ice cream store in your hometown. One of your first concerns is determining how much ice cream you should stock to meet the demands of your customers. You suspect that the number of customers buying ice cream probably depends on several factors. In looking through company files, you discover that the former manager collected considerable data. Last summer, a typical week produced the following data: Day Temperature (degrees Fahrenheit) Number of Transactions Gross Receipts (in dollars) Monday 78 238 3014 Tuesday 73 194 2842 Wednesday 70 172 2141 Thursday 75 185 2235 Friday 83 270 4505 Saturday 89 320 5021 Sunday 94 280 4442 On the graph below, the temperature is graphed on the x axis and the number of transactions is graphed on the y axis. Investigate the relationship between the temperature and the gross receipts. On the grid below, graph…
Please see below. I need to verify this is correct and is there another way to do this problem. Please include an explanation.
A surgeon would like to know how long it takes, on average, to complete a coronary artery bypass surgery. She samples 27 surgeries and logs the time it takes to complete each one, in hours: 6.3, 3.4, 3.6, 5, 3.5, 4.5, 6.2, 5, 4.3, 2.8, 4.2, 4.7, 5.3, 4, 6.3, 3.5, 5.1, 4.5, 2.8, 2.6, 5.4, 2.8, 6.1,6.1, 4.1, 5.7, 4.4 Assuming the population standard deviation is o = 1.1, construct a 95% confidence interval for the average time it takes to complete a coronary artery bypass surgery. Margin of Error: E = We are 95% confident that the mean amount of time it takes to complete a coronary bypass sugery is between hours and hours.
The graphs below show the scores students in an advanced statistics course received for homework completed and for the subsequent midterm exam. Homework scores are based on assignments that preceded the exam. The maximum homework score a student could obtain was 500 and the maximum midterm score was 350. The original score for student 10 was 234 (the lowest) for the homework and 125 (the lowest) for the exam. After the student reviewed the exam, she discovered that only a third of the problems had been graded and she subsequently received a score of 348 (the highest). The scatterplots for the original scores and the revised scores are below. Original scores: 290 шеха 190 100 Revised scores: 350 150 100 Homework scores vs exam scores Iww Exam scores vs homework score observation (234, 125) corrected to (234348) Which of the following is true? 390 Iww The correlations for both the original and corrected scores are the same. The correlation for the original scores is higher. Correlation…
State whether the following statement is true or false, and explain why. If the statement is false, state the true change. A high school reports that its students' SAT scores were down by 6% in one year. The next year, however, the test scores rose by 14%. The high school principal announces, "Overall, test scores have improved by 8% over the past two years."
Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good barometer of the overall stock market. On January 31, 2006, 9 of the 30 stocks making up the DJIA increased in price (The Wall Street Journal, February 1, 2006). On the basis of this fact, a financial analyst claims we can assume that 30% of the stocks traded on the New York Stock Exchange (NYSE) went up the same day A sample of 55 stocks traded on the NYSE that day showed that 22 went up. You are conducting a study to see if the proportion of stocks that went up is is significantly more than 0.3. You use a significance level of a =0.02. What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic= What is the p-value for this sample? (Report answer accurate to four decimal places.) p-value =

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