bỹ a group of 12 students in two examinations A and B. CalculateThe following table gives the marks obtainedthe correlation coefficient between the marks obtained in the twoexaminations and interpret the result:Marks inExaminationAStudentsMarks inExaminationAStudentsB20167181511518It1317to 160) o 81818213151017174141911191818126.16122120

The correlation coefficient is used to measure the linear relation between two variables. The…

Answered: bỹ a group of 12 students in two…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Consider the following data on marks obtained in Quizzes 1 and 2 by a sample of 10 studentsenrolled in a statistics classQuiz 1 Quiz 25 2015 1612 1213 1015 1414 1513 1012 1210 1215 14 for the marks in each quiz calculate covariance correlation coefficient
The marketing head of a leading chocolate manufacturer must decide amongfour different wrapper styles for the chocolate. To provide a database for the decision, he hasthe chocolate placed in the different wrappers and distributes them to five supermarkets. At the end of 2 weeks, he finds that the following amounts of chocolate were sold: Wrapper A Wrapper B Wrapper C Wrapper D 90 98 130 82 compute the Pearson correlation coefficient (Chi Square Test)
The National Safety Council released the following data on the incidence rates for fata or lost-worktime injuries per 100 employees for eight industries in three recent years. Compute the covariance between each pair of years (2018 and 2019), (2018 and 2020) and (2019 and 2020). Compute the coefficient of correlation (r) for each pair of years and determine which years are most highly correlated.
A bank records the number of mortgage applications and its own prevailing interest rate (at the first of the month) for each of 16 consecutive months. Is there a correlation between the interest rate (x) and the number of applicants (y), and if so, is it significant at the 5% or the 1% significance level Answer Choices -0.733, significant at 1% -0.652, no significant correlation -0.587, significant at 5% -0.587, significant at 1% -0.652, significant at 5%
For a sample of n = 20 individuals, what correlation coefficient is necessary to be statistically significant at α =.05?
For a random sample of 53 building supply stores in a chain, the correlation between annual sales per square meter of floor space and annual rent per square meter of floor space was found to be 0.37. Test the null hypothesis that these two quantities are uncorrelated in the population against the alternative that the popula- tion correlation is positive.
The following table shows the scores of 15 students in mid-term test and final examination of a Mathematics course in an academic year: 12.8 60.5 13.6 54.5 13 55.5 12.2 59.5 8 66.5 15.8 52.5 7.6 76 9.4 61.5 13.6 56.5 11.4 60 10.6 56 11.6 61.5 16.4 47 14 56 12.8 58 13.8 51 Calculate the correlation coefficient for the sample. Explain the results At the 5% significant level, test whether students’ performances in mid-term test and final examination are correlated.
(a) A random sample of books produced by a particular publisher was selected. The price and numbers of pages were recorded for each book: Price (RM) 4.80 3.20 3.50 5.60 2.00 4.00 2.50 Number of pages 360 120 230 180 220 300 150 Using Pearson’s coefficient of correlation to indicate if there is any relationship betweennumber of pages and price of the book. b) Twelve pairs of fashion shoes were ranked in order of merit for marketability by two different marketing managers. The following table was obtained as a result: Pairs of shoes Manager A B C D E F G H I J K L I 9 5 1 6 10 2 11 7 8 3 12 4 II 7 4 1 5 9 3 10 8 6 2 12 11 Calculate the Spearman’s Rank Correlation Coefficient.
The critical value for the Pearson's correlation coefficient for two variables collected from 15 people (alpha = 05) would be?
Five observations taken for two variables follow. xi 4 5 12 4 13 yi 50 50 30 50 20 Compute the sample covariance (to 1 decimal and enter negative value as negative figure). Compute the sample correlation coefficient (to 3 decimals and enter negative value as negative figure)
A mad scientist is interested in seeing if there is a relationship between the number of nights until the full moon (X) and the number of Werewolves (Y) that are caught by his assistant Igor. For the data below, compute a Pearson correlation (r) hypothesis test. Because one is not particularly cautious with mad science, the mad scientist is using a two-tailed test, α = .05. Be sure to show all work. Nights until the full moon (X) # of Werewolves caught (Y) 7 1 6 2 2 4 3 5 2 8 1 State the mad scientist’s null and alternative hypotheses 2 Find the critical r 3 Compute the observed r from the sample data 4 Make a statistical decision and a conclusion in everyday language
The director of a shipping company believes that there is a relationship between the cost of a customer’s shipment (£) and the weight (lb) of the package being shipped. For investigating this possible relationship, a random sample of nine customer shipments was selected and the weight (in lb) and the cost (rounded to the nearest £) for each shipment were recorded. The results obtained are shown in the table below (on the picture). required: a) ) The scatter diagram showing the relationship between the cost of acustomer’s shipment (£) and the weight (lb) of the package being shipped, is given below. Comment fully and clearly on this diagram. i) ii)

SEE MORE QUESTIONS

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS