# Stats

4. A least squares regression line to predict a student’s Stat145 test score (from 0-to-100) from the number of hours studied was determined from a class of 55 Stat145 students: ̂ = 48.2 + 2.21x. One student in the class studied for 18 hours and scored 82 on the exam.

(a) (5 pts.) What is the predicted value of this student’s Stat145 exam score?

(b) (5 pts.) What is the residual for this student?

(c) Explain what the slope of this least squares regression line tells us with regard to the explanatory and response variables. Be specific with regard to the value of the slope

1. 👍 0
2. 👎 0
3. 👁 285

## Similar Questions

1. ### Math

The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is

2. ### Math

Find the equation of the regression line and predict y when x = 2.5. x - 1 5 4 2 3 6 y - 25 5 10 20 15 5

3. ### statistics!

1) Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that

4. ### Statistics help please :)

To whoever responds, thanks for your help :). Astrids (*) signify my answer. 1. Find the least squares regression line for the dataset in the table x|y 3|1 4|5 8|11 10|21 a. y=2.55x-6.435 b. y=2.55x+6.435**** c. y=1.477x+1.477 d.

In a study, nine tires of a particular brand were driven on a track under identical conditions. Each tire was driven a particular controlled distance (measured in thousands of miles), and afterward the tread depth was measured.

2. ### Computer Programing & Logic Design

Submit pseudocode and a flowchart for the following programming exercise: Test Average and Grade Write a program that asks the user to enter five test scores. The program should display a letter grade for each score and the

3. ### Statistics

In a study, nine tires of a particular brand were driven on a track under identical conditions. Each tire was driven a particular controlled distance (measured in thousands of miles), and afterward the tread depth was measured.

4. ### statistics

Pre study scores versus post-study scores for a class of 120 college freshman english students were considerated. The residual plot for the least squares regression line showed no pattern. The least square regression line was y =

1. ### Statistics

In Professor Smith's statistics course, the correlation between students' total scores before the final exam and their final exam scores is r = 0.67. The pre-exam totals for all students in the course have a mean of 275 and a

2. ### Statistics

4. The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems:

3. ### statistics

The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student received a score of 82, what was this student’s z-score?

4. ### Math

A student scored 65, 80, 74 on the first three tests during the term. What does the student need to score on the fourth test to ensure and an average score that is above 75?