Question

An instructor wants to use two exams in her classes next year. This year, she gives both exams to the students. She wants to know if the exams are equally difficult and wants to check this by looking at the differences between scores. If the mean difference between scores for students is "close enough" to zero, she will make a practical conclusion that the exams are equally difficult. She has decided to test at a 5% significance level. Differences 1) State and null and alternative hypothesis. (1 pt) 77 Student Exam 1 Score Exam 2 Score Bob 63 69 Nina 65 65 Tim 56 62 Kate 100 91 Alonzo 88 78 Jose 83 87 Nikhil 77 79 Julia 92 88 Tohru 90 85 Michael 84 92 Jean 68 69 Indra 74 81 Susan 87 84 Allen 64 75 Paul 71 84 Edwina 88 82 92 88 69 Ho: Ha 2) Complete the table (3 pts) a) What is the mean of differences? (1 pt) b) What is the standard deviation of differences? (1 pt) 3) Run the t-test paired two sample for means test and show results (2 pts) 4) Is this a one or two-tailed test? (1 pt) 5) What do you conclude? (1 pt)

          An instructor wants to use two exams in her classes next year. This year, she gives both exams to the students. She wants to know if the exams are equally difficult and wants to
check this by looking at the differences between scores. If the mean difference between scores for students is "close enough" to zero, she will make a practical conclusion that
the exams are equally difficult. She has decided to test at a 5% significance level.
Differences
1) State and null and alternative hypothesis. (1 pt)
77
Student	Exam 1 Score	Exam 2 Score
Bob	63	69
Nina	65	65
Tim	56	62
Kate	100	91
Alonzo	88	78
Jose	83	87
Nikhil	77	79
Julia	92	88
Tohru	90	85
Michael	84	92
Jean	68	69
Indra	74	81
Susan	87	84
Allen	64	75
Paul	71	84
Edwina	88	82
92
88
69
Ho:
Ha
2) Complete the table (3 pts)
a) What is the mean of differences? (1 pt)
b) What is the standard deviation of differences? (1 pt)
3) Run the t-test paired two sample for means test and show results (2 pts)
4) Is this a one or two-tailed test? (1 pt)
5) What do you conclude? (1 pt)

An instructor wants to use two exams in her classes next year. This year, she gives both exams to the students. She wants to know if the exams are equally difficult and wants to
check this by looking at the differences between scores. If the mean difference between scores for students is "close enough" to zero, she will make a practical conclusion that
the exams are equally difficult. She has decided to test at a 5% significance level.
Differences
1) State and null and alternative hypothesis. (1 pt)
77
Student Exam 1 Score Exam 2 Score
Bob 63 69
Nina 65 65
Tim 56 62
Kate 100 91
Alonzo 88 78
Jose 83 87
Nikhil 77 79
Julia 92 88
Tohru 90 85
Michael 84 92
Jean 68 69
Indra 74 81
Susan 87 84
Allen 64 75
Paul 71 84
Edwina 88 82
92
88
69
Ho:
Ha
2) Complete the table (3 pts)
a) What is the mean of differences? (1 pt)
b) What is the standard deviation of differences? (1 pt)
3) Run the t-test paired two sample for means test and show results (2 pts)
4) Is this a one or two-tailed test? (1 pt)
5) What do you conclude? (1 pt)

Added by Ryan B.

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