4. As an aid for improving employees working habits, eight employees were randomly selected toattend a seminar-workshop on the importance of work. The table shows the number of workloaddone per week before and after the seminar-workshop. At 0.05, did attending the seminar-workshopincrease the performance level of employees?Before1012871110139.After914111215131214Solution:1. State the hypotheses.Но :H1:2. The level of significance and critical region. a =df =and teritical =3. Compute for the value of t test. DSp =and tcomputed =%3D4. Decision Rule.5. Conclusion.

Answered: Image /qna-images/answer/4f77d3d8-08ea-421a-8f44-bb4024f0ed3a.jpg

Answered: 4. As an aid for improving employees…

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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4. One technique to help people deal with phobias is to have them counteract the feared objects by using imagination to move themselves to a place of safety. In an experimental test of this technique, patients sit in front of a screen and are instructed to relax. Then, they are shown an image of the feared object. The patient signals the researcher as soon as feelings of anxiety reach a point at which viewing the image can no longer be tolerated. The researcher records the amount of time that the patient was able to endure looking at the image. The patient spends 2 minutes imaging a “safe scene” such as a tropical beach or a familiar room before the image is presented again. As before, the patient signals when the level of anxiety becomes intolerable. If patients can tolerate the feared object longer after the imagination exercise, it is viewed as a reduction in the phobia. The data in the table below summarize the times recorded for a sample of n-7 patients. Do the data indicate that…
2. A researcher wants to measure the job satisfaction levels of the employees of two fast food company located in Manila. The researcher has used a questionnaire consisting of ten questions related to job satisfaction levels of the employees. The researcher has used a rating scale from 1 to 4 where 1 is the lowest score and 4 is the highest score. So, a maximum score of 40 and a minimum score of 10 can be obtained. The researcher has randomly selected 15 employees from the first company and 17 employees from the second company. The scores obtained from these employees are given below: First Company: 32 40 31 33 32 30 30 32 31 32 34 32 38 32 28 Second Company: 25 28 23 27 24 26 27 22 25 26 34 25 23 22 29 27 24 Taking 5% as the alpha level, examine the significant difference in terms of job satisfaction level between the employees of the two companies.
Suppose population 1 consists of all students who picked up all the tests they completed prior to taking the final exam. Suppose population 2 consists of all students who had one or more tests that they completed that were not picked up prior to taking the final exam. Based on years of grading final exams and observing grades, STAT 210 instructors conjecture that the mean final exam grade for all students who picked up all their tests is higher than the mean final exam grade for all students who had one or more tests that were not picked up. A simple random sample of 56 students who picked up all tests they completed was selected, and the mean score on the final exam for this sample of students was 83 with a standard deviation of 10.4. An independent simple random sample of 51 students who had one or more tests that were not picked up was selected, and the mean score on the final exam for this sample of students was 67 with a standard deviation of 24.2. Both distributions are skewed…
Supposed a firm conducted a survey of workers involving the variable ‘’skill’’ and ‘educational level’. The survey revealed that 50% of the workers are elementary school graduate (E), 40% are secondary school Graduates (S) and 10% are college and above Graduates (C). If on the basis of skill, the survey revealed that 10% of Elementary school Graduate are unskilled, 5% of secondary school Graduate are unskilled, and 2% of college and above Graduates are unskilled. Suppose a worker is selected randomly and is found to be unskilled. What is the probability that the worker is a College Graduate?
5) Estimate the difference between the proportion of females and males that are very satisfied from the rooms with 95% confidence. (Q2=GENDER,Q12=SATISFIED)
It is desired to estimate the proportion of motor vehicles registered in a province whose chassis number is incorrectly entered in the traffic document. For this purpose, 135 of the vehicles coming to the inspection station are selected randomly and it is seen that the chassis numbers of 41 of these vehicles are wrongly written on the traffic document. Which of the following is the point estimate of the proportion of motor vehicles in this province whose chassis numbers are wrongly written in the traffic document
A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 35 adult Americar sample proportion of adults who respond yes, is approximately normal, how many more adult Amencans does the.researcher ne (a) 10% of all adult Americans support the changes (b) 15% of all adult Americans support the changes (a) The researcher must ask more American adults. (Round up to the nearest integer) (b) The researcher must ask more American adults (Round up to the nearest integer.)
Suppose population 1 consists of all students who picked up all the tests they completed prior to taking the final exam. Suppose population 2 consists of all students who had one or more tests that they completed that were not picked up prior to taking the final exam. Based on years of grading final exams and observing grades, STAT 210 instructors conjecture that the mean final exam grade for all students who picked up all their tests is greater than the mean final exam grade for all students who had one or more tests that were not picked up. A simple random sample of 56 students who picked up all tests they completed was selected, and the mean score on final exam for this sample of students was 83 with a standard deviation of 10.4. An independent simple random sample of 51 students who had one or more tests that were not picked up was selected, and the mean score on the final exam for this sample of students was 67 with a standard deviation of 24.2. Both distributions are skewed…
7. A new drug study was conducted by a drug company. In the study, 10 people were chosen at random to take Vitamin X for 3 months and then have their cholesterol levels checked. In addition, 10 different people were randomly chosen to take Vitamin Y for 3 months and then have their cholesterol levels checked. All 20 people had cholesterol levels between 8 and 10 before taking one of the vitamins. The drug company wanted to see which of the 2 vitamins had the greatest impact on lowering people's cholesterol. The following data was collected: Vitamin X 7.27.5 5.2 6.5 7.7 10 6.47.6 7.77.8 Vitamin Y 4.8 4.44.5 5.1 6.5 8.03.1 4.6 5.2 6.1 (a) Draw a box-and-whisker plot for both sets of data on the same number line. (b) Use the double box-and-whisker plots to compare the 2 vitamins and provide a conclusion for the drug company. (e) State the skewness of both distributions and justify your answer.
Suppose a realtor wants to determine the current percentage of customers who have a family of five or more. How many customers should the realtor survey in order to be 98% confident that the estimated (sample) proportion is within 2 percentage points of the true population proportion of customers who have a family of five or more? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Use the table of values above.
21. Causation Imagine that a team of researchers collects basic information from every student in a large high school (N=1000) and monitors the students' academic performance over a single school year. The researchers find that the students who wear glasses had significantly better grades than the students without glasses. What can we reasonably conclude from this study? Pick ONE option Wearing glasses causes students to achieve better grades The results do indicate some type of causal relationship, but we should be careful generalizing from this one high school -- the effect might not exist in the broader student population. Even if the high school was representative of the broader student population, the results do not indicate any causal link between glasses and academic performance. None of these statements offer reasonable conclusions.
A demographer wants to know what proportion of women in different countries dye their hair. They take a random sample of women from Korea and another random sample of women from China. In Korea, 47% dyed their hair. In China, 56% dyed their hair. (a) What hypotheses would the demographer use to test if women in China are more likely to dye their hair than women in Korea? H0: pChina=pKorea vs. Ha: pChina ≠ pKoreaH0: pChina - pKorea = 0 vs. Ha: pChina - pKorea > 0 H0: μChina-μKorea = 0 vs. Ha: μChina-μKorea ≠ 0H0: pChina-pKorea = 0.09 vs. Ha: pChina-pKorea ≠ 0.09H0: μChina = 0.56 vs. Ha: μKorea = 0.47 (b) Suppose their test yielded a p-value of 0.079. What does this mean in the context of the test? We are 7.9% confident that the results of our test are correct.If the women of two countries have the same rates of coloring their hair, the probability of getting a difference at least this large is 0.079. If we take another sample, the probability of getting the same p̂China and…

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