A B C Question 9:A certain species of tree has an average life span of 130 years. A researcher has noticed a largenumber of trees of this species washing up along a beach as driftwood. She takes core samplesfrom 27 of those trees to count the number of rings and measure the widths of the rings. Countingthe rings allows the researcher to determine the age of each tree. Her data are displayed in theprovided table. One of her interests is determining if this sample provides evidence that theaverage age of the driftwood is less than the 130-year life span expected for this type of tree. Itthe average age is less than 130 years it might suggest that the trees have died from unusualcauses, such as invasive beetles or logging.9879147200 130 6051127 105 75120113 200190819816016513462152666812419015960Use technology and the provided data to determine if this sample provides evidence that theaverage age of the driftwood along this beach is less than 130 years. Use a 5% significance levelto make your conclusion.a. State the parameters and hypotheses.hat theassesmsesb. Find the observed sample statistic.C. Using Statkey or another tool find the p-value.d. Are the results statistically significant? Why or why not?

The random variable age of the driftwood follows normal distribution. We have to test whether the…

Answered: A certain species of tree has an…

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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Find question 3 using the data in question 1.
Question(13): The researcher decided to conduct the study again and selected an additional 10 children from the full time kindergarden and an additional 10 children from partime kindergarden.This time they matched the children in full time and part time based on SES, gender, age and vocabulary scores. They based their hypotheses on the finding from a previous study and wanted to see if children who attended full time kindergarden would have better short term memory recall comparred to children who attended partime kindergarden. Researcher read a list of 20 words then waited for two minutes, as the children had snacks, then ask then to tell them as many words as the could from the list of 20 words. Those who remember got a score of 1. Here is a summary of the result. full time kindergarden: 15 9 10 8 11 7 14 12 11 13 part time kindergarden: 10 7 9 8 12 6 8 10 7 9 Test the hypothses at (alpha…
question(13): The researcher decided to conduct the study again and recruited an additional 10 children from the full time kindergarden and an additional from the part time kindergarden, This time they matched the children in full time kindergarden and partime kindergarden on SES, gender, age, and vocabulary score .They based their hypotheses on the finding from a previous study and wanted to see if full time kinder garden would have better short term memory recall compared to children who attended partime kindergarden. Researchers read a list of 20 words ,then waited 2 minrderdenutes while the kids were having a snack, then they were asked to tell them how many words they remember. .Those who remember a word got a score of 1. A summary of the results is given below fulltime kindergarden: 15 9 10 8 11 7 14 12 11 13 partime kindergarden : 10 7 9 8 12 6 8 10 7 9 test the hypotheses…
QUESTION 5 A highway traffic safety organization collects traffic safety-related data for a certain country. Suppose according to their data, 10,427 fatal collisions in a certain year were the result of collisions with fixed objects. The following table provides more information on these collisions. (Round your numeric answers to four decimal places.) Fixed Object Involved in Collision Number of Collisions Pole/post 1,417 Culvert/curb/ditch 2,515 Shrubbery/tree 2,586 Guardrail 894 Embankment 949 Bridge 230 Other/unknown 1,836 Assume that a collision will be randomly chosen from this population. (a) What is the probability of a fatal collision with a pole or post? (b) What is the probability of a fatal collision with an embankment? (c) What type of fixed object is least likely to be involved in a fatal collision? What is the probability associated with this type of fatal collision? The object that is least likely to be involved in a fatal collision is…
Question 12** The following table lists the approximate number of adults (18+) who are obese (BMI ≥ 25) in North America in 2014 by country and gender. Female Obese Male Obese Female Not Obese Male Not Obese Canada 11 M 12 M 7 M 6 M Mexico 40 M 37 M 21 M 22 M U.S.A. 101 M 113 M 61 M 44 M (adapted from http://apps.who.int/gho/data/node.main.A897A?lang=en) Based on this data, what is the probability that a randomly selected male in North America will be obese? Answer in decimal form. Round to 3 decimal places as needed. Your Answer:
question 28. I will submit this problem in three parts because it is long, and i was asked to seperate longer problems so you are not asked to do more than what you are being paid for. part 1 problem #28 Before the furniture store began its ad campaign, it averaged 146 customers per day. The manager is investigating if the average is larger since the ad came out. The data for the 16 randomly selected days since the ad campaign began is shown below: 172, 147, 168, 163, 166, 139, 158, 151, 137, 140, 138, 137, 158, 133, 144, 144 Assuming that the distribution is normal, what can be concluded at the αα = 0.10 level of significance? A.)For this study, we should use Select an answer t-test for a population mean z-test for a population proportion B.)The null and alternative hypotheses would be: H0:H0: ? p μ Select an answer < = ≠ > H1:H1: ? μ p Select an answer > < ≠ = C.)The test statistic ? z or t = ____ (please show your answer to 3 decimal places.)
Question 3 A survey sponsored by The American Dietetic Association and the agribusiness giant ConAgra found that 53% of office workers take 30 minutes or less for lunch each day. Approximately 37% take 30 to 60 minutes, and 10% take more than an hour. What additional information you want to know before you accepted the results of the survey? 2. Discuss the four types of survey errors in the context of this survey
Question 15 Consider an operational process in a factory where widgets are produced. As the process is not perfect, errors sometimes happen, and the errors are either technical or human. Over the last 100 days, errors were observed and recorded. On any given day, there occurred zero to three (0 to 3) human errors and zero to three (0 to 3) technical errors. The frequency distribution of errors is given in the following contingency table. Number of human errors No. of Tech Errors 0 1 2 3 Total 0 8 6 4 4 22 1 5 8 9 10 32 2 4 5 10 8 27 3 0 3 4 12 19 Total 17 22 27 34 100 What is the probability of 3 human errors on any given day? State your answer as a decimal value rounded to two digits after the decimal point.
Question 6 In a study with a total of 200 people, you have determined that typists have an incidence of 25 per 100 (25%) of carpal tunnel syndrome compared to only 5 per 100 (5%) of people employed in professional, white-collar occupations. This was a 2-year follow-up study and there was no loss to follow-up. All subjects in the study were free from carpal tunnel syndrome at the beginning of the study. Use the following information to set up a 2 x 2 table and calculate appropriate measure of association. b) Draw the 2x2 table and complete the table.
Question 4: The following data includes the year, make, model, mileage (in thousands of miles) and asking price (in US dollars) for each of 13 used Honda Odyssey minivans. The data was collected from the Web site of the Seattle P-I on April 25, 2005. year make model mileage price 2004 Honda Odyssey EXL 20 26900 2004 Honda Odyssey EX 21 23000 2002 Honda Odyssey 33 17500 2002 Honda Odyssey 41 18999 2001 Honda Odyssey EX 43 17200 2001 Honda Odyssey EX 67 18995 2000 Honda Odyssey LX 46 13900 2000 Honda Odyssey EX 72 15250 2000 Honda Odyssey EX 82 13200 2000 Honda Odyssey 99 11000 1999 Honda Odyssey 71 13900 1998 Honda Odyssey 85 8350 1995 Honda Odyssey EX 100 5800 Compute the correlation between age (in years) and mileage for these minivans. (Assume the correlation conditions have been satisfied and round your answer to the nearest 0.001.)
Question 4 a The researcher is concerned that older persons may not be knowledgeable of the COFLU-20. Assuch, he is interested in investigating the association between the age of the respondents and theirknowledge level. Table 2 below shows the knowledge level of respondents, by age group.Table 2Age Group Knowledge Level TotalPoor Satisfactory Good18 - 25 33 16 13 6226 - 34 30 18 12 6035 - 44 29 14 12 5545 - 54 36 16 18 7055 - 75 17 14 22 53Total 145 78 77 300 Conduct a test, at the 5% level of significance, to determine whether the data provided sufficientevidence to conclude that an association exists between age group and knowledge level. (i) State the hypotheses to be tested:H0:H1: Calculate:(ii) state the degrees of freedom for this test (iii) the p-value for this test, given that the chi-square test statistic, x2, is 11.029. (iv) state the conclusion for the test. Give reason for your answer.
QUESTION 4(a) The researcher is concerned that older persons may not be knowledgeable of the COFLU-20. Assuch, he is interested in investigating the association between the age of the respondents and theirknowledge level. Table 2 below shows the knowledge level of respondents, by age group.Table 2Age Group Knowledge Level TotalPoor Satisfactory Good18 - 25 33 16 13 6226 - 34 30 18 12 6035 - 44 29 14 12 5545 - 54 36 16 18 7055 - 75 17 14 22 53Total 145 78 77 300Conduct a test, at the 5% level of significance, to determine whether the data provided sufficientevidence to conclude that an association exists between age group and knowledge level.(i) State the hypotheses to be tested:H0:H1: [Calculate:(ii) state the degrees of freedom for this test (iii) the p-value for this test, given that the chi-square test statistic, 2, is 11.029.(iv) state the conclusion for the test. Give reason for your answer.continue

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