Answered: A newspaper article is summarized:…

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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Question

A newspaper article is summarized: According to a new study, teachers may be more inclined to give higher grades to students, hoping to gain favor with the university administrators who grant tenure. The study examined the average grade and teaching evaluation in a large number of courses given in 1997 in order to investigate the effects of grade inflation on evaluations. "I am concerned with student evaluations because instruction has become a popularity contest for some teachers," said Professor Smith, who recently completed the study. Results showed higher grades directly corresponded to a more positive evaluation.

Which of the following would be a valid conclusion to draw from the study?

	a.	Teachers can improve their teaching evaluations by giving higher grades.
	b.	A good teacher, as measured by teaching evaluations, helps students learn better, which results in higher grades.
	c.	Higher grades result in above-average teaching evaluations.
	d.	None of the answer options is correct.

Is the mean age at which American children first read now different from four years? If the population of all American children has a mean age of  years until they begin to read, which of the following null and alternative hypotheses would be tested to answer this question?

a.
H₀:  = 4 vs. H_a:  < 4

b.
H₀:  = 4 vs. H_a:  > 4

c.
H₀:  = 4 vs. H_a:   4

d.
H₀:  = 4 vs. H_a:  = 4 ± , assuming our sample size is n