Maurice Tutor

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About Maurice Tutor

Levels Tought:
Elementary,Middle School,High School,College,University,PHD

Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 398 Weeks Ago, 2 Days Ago
Questions Answered: 66690
Tutorials Posted: 66688

Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 06 Jan 2018 My Price 8.00

Scholastic Assessment Test

 

 

4.67             Improving SAT scores. Refer to the Chance (Winter 2001) study of students who paid a private tutor (or coach) to help them improve their Scholastic Assessment Test (SAT) scores, Exercise 4.50 (p. 223). Recall that the base-

 

line   model,   E(y) = β0 + β1x1 + β2x2,  where

 

y = SAT– Math score, x1  = score on PSAT, and

 

As an alternative model, the researcher    added

 

several ‘‘control’’ variables, including dummy variables for  student  ethnicity (x3, x4, and x5), a socioeconomic status index variable (x6), two variables that measured high school performance (x7 and x8), the number of math courses  taken in high school (x9), and the overall GPA for the math courses (x10).

 

(a)    Write the hypothesized equation for E(y) for the alternative model.

 

(b)    Give the null hypothesis for a nested model F -test comparing the initial and alternative models.

 

(c)    The nested model F -test, part b, was sta- tistically significant at α = .05. Practically interpret this result.

 

(d)   

2
 

 

a
 

The alternative model, part  a,  resulted in Ra = .79, βˆ2 = 14, and sβˆ2 = 3. Interpret the value of R2.

(e)     Refer to part d. Find and interpret a 95% confidence interval for β2.

 

(f)    The researcher concluded that ‘‘the esti-

 

mated effect of SAT coaching decreases from the baseline model when control vari- ables are added to the model.’’ Do you agree? Justify your answer.

 

(g)     As a modification to the model of part a, the researcher added all possible interactions between the coaching variable (x2) and the other independent variables in the model. Write the equation for E(y) for this modified model.

 

(h)    Give the null hypothesis for comparing the models, parts a and g. How would you perform this test?

 

 

 

 

 


Answers

Maurice Tutor
(5)
Status NEW Posted 06 Jan 2018 04:01 PM My Price 8.00

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