10. A random sample of boarding school students was asked how many 8-ounce servings of soda they had consumed on a certain Sunday and how many hours of sleep they got that night. Their responses are displayed in the scatter plot below.
Soda |
Sleep |
0 |
6 |
0 |
8 |
1 |
6 |
1 |
7 |
2 |
7 |
3 |
5 |
3 |
8 |
4 |
6 |
5 |
5 |
6 |
3 |
6 |
6 |
7 |
4 |
7 |
6 |
8 |
3 |
10 |
2 |
a) Which variable has been used as the explanatory variable in making the scatterplot above? Could the two variables have been reversed? Explain. [3 pts]
The explanatory variable would be the # of sodas and no the two variables can not be reversed because the number of sodas won't be changed by the sleep the students get at night
b) Find the Least-Squares Regression Line on the calculator. Round using 2 decimals. [2 pts]
c) Identify and interpret the y-intercept of the LSRL in context of the problem. [3 pts]
d) Suppose that a student had 6 servings of soda that Sunday. What would you predict for the number of hours the student slept that night? Show your work. [2 pts]
e) Find the correlation coefficient and coefficient of determination using the calculator. [2 pts]
r = __________ r2 = __________
f) Interpret the meaning of in this setting. [2 pts]
g) Calculate the residual for the point (6, 3). [3 pts]
Residual = _______
10. A random sample of boarding school students was asked how many 8-ounce servings of soda...
Assignment 2: DataDX PaperCut ME:Web Printx A Persepols: The Story of acx Microsoft Office Homex O 87/quizzes/41945/take D Question 6 1 pts The following graph shows a distribution of hours slept last night by a group of college students. Select the statement below that gives the most complete description of the graph in a way that demonstrates an understanding of how to statistically describe and interpret the distribution of a variable. 20 15 10 2 34 56789 10 11 Hours...
A random sample of community college students was asked the number of hours they sleep on a typical week-night during a given academic term. The sample data are as follows: 8 6 4 5 3 7 S 4 3 4 4 5 6 8 7 7 7 3 3 4 What is the 90% confidence interval estimate for the true mean amount of sleep time per night spent by community college students during a academic term? a) The data give...
1. (15 pts total) Fourteen students participated in a research study on the effect of sleep deprivation in a motor skill task. The students played the game "Operation" either after a full night of sleep or after being kept awake for 36 hours. Each task was measured two weeks apart. Half of the students were randomly assigned to sleep deprivation in the first week and a full night of sleep in the second week, and the other half completed the...
A random sample of 214 junior and senior college students was
taken. Each student reported the average amount of sleep they get
per night (in minutes) and their current college GPA. Plots from a
simple linear regression analysis are displayed below.
Which of the following is true about the linearity
condition?
1.The linearity condition is not satisfied because there is
curvature in the normal probability plot of the residuals.
2.The linearity condition is satisfied because most of the
residuals...
The following data represents the number of days absent and the final grade for a sample of college students in a general education course at a large state university. 0 1 2 3 4 5 6 7 8 9 No. of absences Final Grade 89.2 86.4 83.5 81.1 78.2 73.9 64.3 71.8 65.5 66.2 a) Which variable is the explanatory variable? b) Draw a scatter plot and describe your scatter plot (Direction, Strength, Form). c) Compute the correlation coefficient d)...
Question 2. The following variables were collected for a random sample of 10 students. Based on information below, identify and interpret least-squares regression equation. Also, identify and interpret the strength, PRE, direction, and significance of the association between the dependent and independent variable at the alpha level of 0.05. Show five steps if relevant. Obtain all the relevant statistics. Provide a brief overall conclusion. (10 marks) Hours of watching TV a day (X). 6 5 12 10 7 5 6...
1. The following data represents the number of days absent and the final grade for a sample of college students in a general education course at a large state university. No. of absences 0 1 2 3 4 5 6 7 8 9 Final Grade 89.2 86.4 83.5 81.1 78.2 73.9 64.3 71.8 65.5 66.2 a) Which variable is the explanatory variable? b) Draw a scatter plot and describe your scatter plot (Direction, Strength, Form). c) Compute the correlation coefficient....
Key Takeaways
-To create 2 groups of 4 students (8 students in total)
-NEEDS random GPAs for each student
-No arrays
-------------------------------------
app.java, student.java, and
group.java as requested below.
Please use the diagram above to help answer the Question:
Create a project that:
Has a student class
Instance variables for Firstname, last name , and age
random generated GPA
methods to return getinfo and semesterGPA
Build upon the solutions of the previous labs (e.g., using
app.java and student.java)
You will...
2. The following data were collected last semester on ten students. Complete a multiple regression analysis in which you use AGE (A), MATH PROFICIENCY (MP) (on a 1 –10 scale), and GENDER (G) (0 = male, 1 = female) as predictors of FINAL EXAM (FE) performance. Do this analysis in SPSS and then answer the following questions. Subject # A MP G FE 1 35 8 1 90 2 31 6 0 88 3 26 5 1 84 4 33...
Question 1. Thirty graduate students were asked how many credit hours they were taking in the current quarter. Download the available data: Calculate the mean, median, standard deviation, variance, and range for this sample using Excel. Write a sentence explaining what each measure means. What is the standard error of the mean based on the data? What would be the best point estimate for the population credit hours? (“Population” refers to all graduate students’ credit hours in the universe.) What...