18. You Explain It! Quartiles One variable that is measured byonline homework systems is the amount of time a studentspends on homework for each section of the text. The followingis a summary of the number of minutes a student spends foreach section of the text for the fall 2018 semester in a CollegeAlgebra class at Joliet Junior College.Q₁ = 42 Q₂ = 51.5 Q3 = 72.5(a) Provide an interpretation of these results.(b) Determine and interpret the interquartile range. (c) Suppose a student spent 2 hours doing homework for asection. Is this an outlier?(d) Do you believe that the distribution of time spent doinghomework is skewed or symmetric? Why?

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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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Prehistoric pottery vessels are usually found as sherds (broken pieces) and are carefully reconstructed if enough sherds can be found. An archaeological study provides data relating x = body diameter in centimeters and y = height in centimeters of prehistoric vessels reconstructed from sherds found at a prehistoric site. The following Minitab printout provides an analysis of the data. Predictor Coef SE Coef T PConstant -0.215 2.429 -0.09 0.929Diameter 0.7905 0.1471 5.29 0.003 S = 4.07980 R-Sq = 87.5% a) For the least-squares line ŷ = a + bx, what is the value of the constant a? What is the value of the slope b? (Note: The slope is the coefficient of the predictor variable.) Write the equation of the least-squares line.a = b = ŷ = ______+ ____x b) The P-value for a two-tailed test corresponding to each coefficient is listed under P. The t value corresponding to the coefficient is listed under T. What is…
Determine whether the data represents a correlation with causation or a correlation without causation. Explain.
Which statistical tool studies the relationship between two or more variables? a. Median b. Correlation c. Mean d. Range
Which of the following is NOT an example of cross-sectional data?
use the sample data to construct a scatterplot. Use the first variable for the x-axis. Based on the scatterplot, what do you conclude about a linear correlation? FORECAST AND ACTUAL TEMPERATURES The table lists actual high temperatures and the high temperatures that were previously forecasted for these same days. The table includes data for ten different days near the author’s home. What does the result suggest about the accuracy of five-day predicted high temperatures?
Determine whether the data is from a primary or secondary source. Primary Secondary
Which variable is most likely to be an independent variable? reading test score stress level running speed weight loss forms of therapy
Joselyn hopes to receive a grade of B or better in her statistics class. Currently she has scored 75, 83, and 81 on her three in-class tests and also has a homework average of 88. Her professor calculates the class grade by finding the mean of five grades: three in-class tests, the homework average and the final exam. What is the minimum score Joselyn must earn on the final exam to have a class grade (mean) of 80? A. 67 B. 95 C. 70 D. 73
Instruction: Complete the tables by providing the required value/s in each cell. Round off your answers to two decimal places only.
A teacher is interested to know whether the average number of hours spent by the students in watching educational YouTube videos has a significant relationship with their performance during the final term examination. He surveyed a group of students on his class and tabulated the result. Use 0.05 level of significance. Student Number of Hours (X) Exam Scores (Y) A 4. 36 2 20 21 4 36 E 27 3 25 G 2 19 20 23 J 45 K 6. 49 L 40 M 26 N 2. 40 34 Ex- ТОTAL Y = = What is the linear regression equation?
A teacher is interested to know whether the average number of hours spent by the students in watching educational YouTube videos has a significant relationship with their performance during the final term examination. He surveyed a group of students on his class and tabulated the result. Use 0.05 level of significance. Student Number of Hours (X) Exam Scores (Y) A 4 36 B 2 20 3 21 D 4. 36 E 27 3 25 2 19 H 1 20 5 23 J 4. 45 K 49 40 M 5 26 N 2 40 3 34 ТOTAL X = = What is the value of the slope?

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