Answered: A statistician finds a Pearson…

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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Based on what you know about correlation, which one of the following statements must be incorrect? O There is a correlation ofr=-0.32 between number of websites visited last week and political party affiliation.. O The correlation between score on the midterm exam and score on the final exam is r= 0.64. O The correlation between the amount of fertilizer used and quantity of beans harvested isr= 0.57. O There is a correlation of r= 0.79 between height of a corn stalk and its age in weeks. O There is a correlation of r= 0.78 between the price of a book and the number of pages in the book.
A veterinarian collects data about puppies in her practice. She makes ascatterplot with their age in days on the horizontal axis and weight in ounces (oz)on the vertical axis and sees that the scatterplot is football shaped. The averageage of the puppies is 42 day, with an SD of 7 days. The average weight is 25 oz,with an SD of 5 oz. The correlation is moderately strong, with r = 0.7.(a) The age of two puppies differ by 20 days. The difference in their weight ispredicted to be ________________ oz.(b) The baseline prediction for the weight of puppies ignores their age and justuses the information from all puppies. The baseline predicted weight is________________ oz and the RMS error for this prediction is ________________ oz.(c) Suppose we converted the units of age from days to weeks. The average ageis now _______________ weeks, with an SD of _______________ weeks. Thecorrelation between age in weeks and weight in oz is nowr = ___________________
You calculate a correlation coefficient of -0.8 for the two characteristics of eating a particular fruit and having a particular level of blood cholesterol. What can you conclude? There is not enough information in this question to provide an answer. The more of this fruit you eat, the lower your blood cholesterol will be. There is no correlation between eating this fruit and having a particular level of blood cholesterol. The more of this fruit you eat, the higher your blood cholesterol will be. There is a correlation between eating this fruit and having a particular blood cholesterol, but the value of 0.8 is too low to draw any conclusions.
..Which of the following values could not represent a correlation coefficient? r= 0.98r = 1.09r = -.075r = -1.0
A researcher is interested in testing the relationship between height and weight in a sample of 100 people. The sample Pearson's r is calculated to be 0.7. What can the researcher conclude about the relationship between height and weight?
A correlation coefficient provides two pieces of information about a relationship between two variables. These are -Strength; direction of relationship - Direction, proportions - Direction, which one causes which - Which one causes which, effect size. READ FIRST: Show as much of your work in the text box below as possible, and include the rest in your scratch work. Scratch work supports what you write on this exam form. At the minimum, type your answers to each of the following 5 questions A-E in the text box - do not refer me to your scratch work for the answers. Do show your work (on the exam form or scratch work) for the calculations needed to answer B, so partial credit can be given in the case of a math error that throws off your calculations. The best way to do this is inside tables if possible. Total 10 15 You conduct a survey to find out whether talking on a cell phone during a romantic date bothers people. You want to find out if there is a gender difference on this issue,…
An r value of .8 indicates a strong positive correlation. True False
Which of the following correlation coefficient would reflect a conclusion made by a researcher that two variables are not related? r = –.30 r = +.02 r = +.36 r = –.98
If you have a correlation (r=.90), the coefficient of determination would be:
Respond to the following questions about Pearson’s correlation. Which is a stronger correlation, r = 0.48 or r = -0.56? Explain.
The table below lists the mean systolic blood pressure during surgery (mmHg) along with blood loss (ml). Use this table to answer the next three (3) questions . BP Blood Loss 95274 90 170 Strength of Relationship 125 352 105317 weak moderate 110 171 105 150 90 245 90 120 none none 1/4 * 1/2; 3/4 13. Does the correlation coefficient indicate a strong linear correlation ? ( A) Yes ( B) No 14. Approximately what blood loss would you predict for a blood pressure reading of 140 ( A) 319 (B) 363 ( C) 401 ( D) 635 15. Do these data provide sufficient evidence , at the 0.05 level of significance , to indicate that the two variables are indeed correlated ?
c) Show that the coefficient of determination, R², can also be obtained as the squared correlation between actual Y values and the Y values estimated from the regression model where Y is the dependent variable. Note that the coefficient of correlation between Y and X is Eyixi r = And also that ỹ = ŷ (18.75)

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A statistician finds a Pearson correlation of r = 0.29. What does this correlation tell us about the association between X and Y?