You want to find out if developmental English courses have ANY affect on students' writing skills. You have a sample 31 students do a writing sample the first day and on the last day of class. You...

You want to find out if developmental English courses haveANY affect on students' writing skills. You have a sample 31 students do a writing sample the first day and on the last day of class. You want to determine if there is any significant gains or losses in writing ability at the 0.05 level.

You believe the population of difference scores is normally distributed. You obtain the following sample of data:

post-test	pre-test
71.9	70.7
59.6	39.3
63.6	82.5
36.9	37.3
50.4	50.4
70.2	63.7
60.8	52.6
81.7	92.8
61.2	37.4
47.3	32
91.9	60.5
30.7	37.2
45.9	36.5
66.7	45.1
87.8	99.6
44.9	40.8
56.6	79.9
42.7	35
80.3	59.4
36.9	57
54.7	35.7
37.8	42.8
30.7	33.3
43.8	39.7
64	55.8
41.5	39
42.7	42.7
58.5	37.6
60.4	56.3
47.8	67.9
52.8	54.1

Use the 0.05 alpha level.

What is the critical value for this test?
critical value = ±±

What is the test statistic for this sample?
test statistic =

The test statistic is...

not in the critical region

in the critical region

This test statistic leads to a decision to...

fail to reject the null

reject the null

accept the null

As such, the final conclusion is that...

You were able to show that students had significant losses in writing ability at the end of the course

You were able to show that their pre-course writing ability equaled their post course writing ability.

You were unable to show any significant gains or losses in writing ability.

You were able to show that students had significant gains in writing ability at the end of the course

You were able to show that students had at least as good writing ability at the end of the course as they did in the beginning of the course

Jun 08, 2022

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You want to find out if developmental English courses have ANY affect on students' writing skills. You have a sample 31 students do a writing sample the first day and on the last day of class. You...

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