Before, the students scored an average of 105 out of 150 on the exam. If 203 stu

Question

Before, the students scored an average of 105 out of 150 on the exam. If 203 students signed up for the stats course, and used the software by the salesman, and scored an average of 108 points on the final with a standard deviation of 8.7 points... A) should the professor spend the money for this software? Support your recommendation with an appropriate test.
B) does this improvement seem to be practically significant? Before, the students scored an average of 105 out of 150 on the exam. If 203 students signed up for the stats course, and used the software by the salesman, and scored an average of 108 points on the final with a standard deviation of 8.7 points... A) should the professor spend the money for this software? Support your recommendation with an appropriate test.
B) does this improvement seem to be practically significant? If 203 students signed up for the stats course, and used the software by the salesman, and scored an average of 108 points on the final with a standard deviation of 8.7 points... A) should the professor spend the money for this software? Support your recommendation with an appropriate test.
B) does this improvement seem to be practically significant?

Explanation / Answer

Null Hypothesis : mu =105

Alternate Hypothesis : mu > 105

n = 203

SD = 8.7

X = 108

z = ( 108 -105) / ( 8.7 / sqrt(203))

= 4,91

Therefore P-value ~ 1.

Heance failed to reject null hypothesis.

A) Professeur should spend money.

B) This improvement seem to be practically may or may not be significant.

z = ()

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