Prof. Graham believed his CSUN students weren’t doing very well in his statistic

Question

Prof. Graham believed his CSUN students weren’t doing very well in his statistics class compared to the population of his student which has a population mean of 450 and a population standard deviation of 80. Prof. Graham took a SRS of 64 students from his current CSUN students. They had a sample mean (M) = 430. Assume the sample of 25 scores is normal in shape.

1.         What is the p-value?

a. p = .9772

b. p = .0228

c. p = .0456

d. p = .05

e. p = 1.96

2.         What is the correct decision given the outcome of the study?

            a.         Fail to reject HO, results were statistically significant

            b.         Reject HO, results were statistically significant

            c.         Fail to reject HO, results were not statistically significant

            d.         Reject HO, results were and do the follow-up analysis

            e.         Both ‘b’ and ‘d’

3.         The follow-up analysis ______.

a. Should consist of a confidence interval and some form of practical significance

b. Should consist of a point estimate, margin of error, and some form of scientific significance

c. Both ‘a’ and ‘b’

d. Is not appropriate

e. None of the above

4.         Assume a follow-up analysis is appropriate. What is the confidence interval equal to?

a. 450 +/- Margin of error

b. 430 +/- 1.96 (10)

c. 430 +/- 1.96 (80)

d. 450 +/- 1.96 (10)

e. Both ‘a’ and ‘d’

Explanation / Answer

here std error =std deviation/(n)1/2 =10

hence test stat z=(X-mean)/std error =(430-480)/10 =-2

1)p value=0 .0228 option b

2)option e

3)option c

4)option e

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.