49. With a view to study whether the working condition in a factory had anyinfluénce on the frequency of accidents, a researcher collected and tabulated the accidentdata as follows:No. of AccidentsWorking ConditionTotalLessMoreGood28080360Bad120120240Total400200600Using Yule's methodology, calculate the coefficient of association between the number ofaccidents and the working condition in the factory. What inference would you draw from theresult ?infees

Answered: Image /qna-images/answer/b3ae6bba-f81a-4081-b8a0-f44a0ce63503.jpg

Answered: 49. With a view to study whether the…

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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23)
Suppose a researcher is interested in examining the relationship between a person 's age and whether he or she likes the taste of cilantro. She collects a sample of n- 10 people and asks them whether they like the taste of cilantro. The following table summarizes the results. Does not like Cilantro Does like Cilantro 18 years old 2 18+ years old 3 The researcher wants to calculate the correlation between a person 's age and whether he or she likes the taste of cilantro. To do so, you (the researcher) must first create a table of the data by converting each variable to a numerical value. Assign a 0 to "< 18 years old" and 1 to "18+ years old." Then assign O to "does not like the taste of cilantro" and a 1 to " likes the taste of cilantro." Complete the top two rows of the your (the researcher's) data. Age (0 is <18; 1 is 18+) Likes the taste of Cilantro (0 is no; 1 is yes) a) ob) 1 a) Ob) 1 a) ob) 1 a) Ob) 1 1 1 1 1 1 1 1 The phi-coefficient is a) -0.09 b) -0.16 c) -0.20 d) 0.80
3. For the information given below, find the correlation coefficient and describe the type of correlation that exists between the data. Then find the line of best fit. If the correlation is strong, then predict a single data point that is higher than those found in the table. If the correlation is not strong, then state this in a sentence. The table below lists gas prices (dollars per gallon) for regular and premium gas at 8 randomly selected WAWA gas stations in the Orlando area. 2.99 3.65 2.89 3.09 3.21 2.55 2.61 Regular Gas Premium Gas 3.98 3.84 3.99 3.69 3.54 3.66 3.98 2.79 3.99
Mr. Friend noticed that meetings tended to start late when there were a lot of people in attendance and decided to study that relationship. He collecting data on the number of people who were attending each meeting and the number of minutes late that the meeting started. He noticed there was one point that seemed unusual, so he removed it from the data set. What is true about the point that was removed? a. the point is not unusualb. It is an influential observationc. It has the largest residuald. The slope changes little when the point is removedSelected:e. The correlation is lower with the removal of the point
82. What is the linear correlation coefficient, r, for the following set of sample data? 0.8468 0.9747 0.9257 0.9621
The boxplot shown below results from the heights (cm) of males listed in a data set. What do the numbers in that boxplot tell us? 152 176.7 192 168.6 183.6 The minimum height is cm, the first quartile Q, is cm, the second quartile Q, (or the median) is cm, the third quartile Q, is cm, and the maximum height is cm. (Type integers or decimals. Do not round.)
If pis the correlation coefficient, the quantity -p is termed as: Coefficient of determination a) b) Coefficient of non-determination coefficient of alienation d) all the above Answer A B D
find : c ) Does data provide evid. of an association between age and opinion of brand? Justify your answer.
d) Correlation by eye Sample size=45 y 20- 15- og 8. 10- 5. 10 15 20 25 X Try to guess the sample correlation within +/- 0.1 Guess: Correlation: Sample coeficient of correlation a o 00 00
40 30 20 10 0 00 : 00000 -1.00 00000 -0.75 3. A statistics student seeking part-time employment as a New York City cab driver is trying to decide between driving a yellow cab or a green cab and examines tip amounts to help in making the decision. Using data from the New York City Taxi & Limousine Commission (http:// www.nyc.gov/html/tlc/html/about/trip_record_data.shtml), the stu- dent examines tip amounts from 25 randomly selected green cab fares and tip amounts from 25 randomly selected yellow cab fares. Graphs and summary statistics of the sample data from green cabs (G) and yellow cabs (Y) are shown. Green Cab ooooooooo000 Yellow Cab oooooooooooo 우1 -0.50 88.8. COCO 2 - 3 -0.25 4 5 Amount of Trip 0.go null = 0 Source: http://www.nyc.gov/html/tlc/html/about/trip_record_data.shtml Because each sample includes outliers, a two-sample t-test for H₁ a difference in means is not appropriate to test the hypotheses: Ho: MG My = 0, Ha:MG My # 0. The student simulates a distri- µy bution of…
8.
24. The personnel manager of a consumer product company asked a random sample of employees how they felt about the work they were doing. The following table gives a breakdown of their responses by gender. Do the data provide sufficient evidence to conclude that the level of job satisfaction is related to gender? Use a = 0.10 Gender Male Female Very Interesting 70 35 Response Fairly Interesting 41 34 Not Interesting 9 11

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