2. The phone rings and the President is calling you. He says, 'Can you please tell me howmuch of the variability of my popularity rating is explained by the inflation rate? This isthe data:Inflation 10128|14ratePopularity70Rating75858448

Let us consider inflation rate as X and popularity rating as Y. Excel Procedure: Enter X and Y in…

Answered: 2. The phone rings and the President is…

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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2. DETAILS MY NOTES A researcher reports that there is no consistent relationship between grade point average and the number of hours spent studying for college students. The correlation between grade point average and the number of hours studying is an example of O a positive correlation. O a negative correlation. O a correlation near zero. O a correlation near one. MY NOTES Suppose there is a correlation of +0.87 between the length of time a person is in prison and the amount of aggression the person displays on a psychological inventory. This means that spending a longer amount of time in prison causes people to become more aggressive. O True O False
Your Question: A psychologist believed that as children get older, they engage in more “inactive activities” such as playing computer games, watching TV and surfing the internet. She collected data from 10 children. She recorded the age of each child and the amount of activity (in hours) the child engaged in per week. The data is below: Age Activity 7 4.3 9 3.2 10 1 13 1.5 12 1.2 15 0.8 9 3 12 4 15 1.5 14 1.9 Using excel, obtain a scatterplot of the data. Discuss the relationship between age and activity based on the scatterplot. Using excel, obtain the simple linear regression linear regression line predicting activity from age. Interpret the intercept and slope of the regression line. By hand, predict the amount of activity for age = 14. By hand, calculate the residual for age = 14. Using excel, test the null hypothesis that the slope coefficient is zero using the p-value approach. Write one sentence interpreting the meaning of this result. Make sure to…
7
Subject: algebra
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Exhibit 10-30 A quantitative analysis teacher wants to see if there is any difference in the abilities of students enrolled in statistics in the summer and in the fall. Examination scores from a random sample of students enrolled this fall and from a random sample of students enrolled in the summer were selected. You are given the following information. x O n 6 -2.34 -10.77 Fall -6 74 17.06 35 Refer to Exhibit 10-30. The point estimate for the difference between the means of the two populations is Summer 84.77 19.01 28
Government agencies keep data about the income distribution of the population. The Garcia family and Wood family live in a county with 6000 families. The Garcia family's income is at the 38 percentile. The Wood family's income is at the 73 th percentile. (If necessary, consult a list of formulas.) (a) Which of the following must be true about the Garcia family's and the Wood family's incomes? Both the Garcia family and the Wood family earn more than the median income. Both the Garcia family and the Wood family earn less than the median income. O The Wood family earns more than the Garcia family. O The Garcia family earns more than the Wood family. (b) Which of the following must be true about the Garcia family's income? O About 38% of the families in their county earn less than the Garcia family. O The Garcia family earns about 38% of the highest income in their county. O The Garcia family's income is in the top half of incomes in their county. O The Garcia family earns $38,000.
← 3:24 The data to the right represent the number of customers waiting for a table at 6:00 P.M. for 40 consecutive Saturdays at Bobak's Restaurant. Complete parts (a) through (h) below. (a) Are these data discrete or continuous? Explain. Frequency (c) Construct a relative frequency distribution of the data. Number of Customers 1-3 4-6 7-9 10-12 13-15 (Type integers or decimals. Do not round.) 1 6 10 15 8 Relative Frequency ||| = 12 O 15 11 14 11 13 14 12 15 13 6 6 8 A. The data are discrete because it was recorded for 40 consecutive Saturdays. B. The data are discrete because there are a finite or countable number of values. The data are continuous because there are a finite or countable number of values. D. The data are continuous because it was recorded for 40 consecutive Saturdays. C. (b) Construct a frequency distribution of the data. Number of Customers 1-3 4-6 7-9 10-12 13-15 13 9 2 | 46 | 2 14% LTE2 7 10 3 6 12 7 7 40 10 8 12 11 10 10 8 6 10 12 4 9 10 9 14 9 12
Assignment #4 Correlation 4.1 What information is provided by the sign (+ or -) of the Pearson correlation? 4.2 What information is provided by the numerical value of the Pearson correlation? 4.3 For the following set of data: Y 2 4 7 6 7 Sketch a graph showing the location of the five X,Y points. Just looking at your graph, estimate the value of the Pearson correlation. Compute the Pearson correlation for this data set using the formula sheet handed out in class. а. b. с.
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2. The phone rings and the President is calling you. He says, 'Can you please tell me h much of the variability of my popularity rating is explained by the inflation rate? This the data: Inflation 10 12 8 6 14 Irate