Using SPSS for calculating Confidence Interval (CI)

This tutorial will show you how to use SPSS to produce Confidence Interval for the population mean when we haveone-sample and Confidence Interval for the difference between two population means when we have twoindependent samples.

Older	Younger	GPA	Points	work hours	study	PhD	Extravert	Gender	Pet	Area
0	2	3	257	30	10	0	2	1	1	1
2	0	2.5	278	10	14	0	4	1	1	5
1	1	3.49	246	16	10	0	3	1	2	1
1	0	4	278	0	14	0	2	1	2	1
0	1	2.6	214	0	30	1	2	1	2	4
1	0	2.7	278	4	5	1	2	1	2	2
1	1	3.872	278	30	15	0	5	1	1	3
2	1	2.9	257	0	15	1	2	1	1	1
1	1	3.3	300	10	5	0	1	1	2	5
2	0	3.93	285	0	38	1	4	2	2	2
4	0	3.13	257	10	8	1	2	2	2	2
0	2	2.3	278	3	7	0	3	2	2	1
0	2	3	278	0	40	1	2	1	1	2
2	2	3	278	0	5	1	4	1	2	2
1	1	3.47	267	7	7	1	4	1	2	2
1	0	3.2	261	0	22	0	1	1	2	3
2	0	3.4	252	2	40	0	3	2	2	5
1	1	1.9	278	4	999	0	1	1	2	5
2	4	3.33	257	0	3	1	3	1	1	1
2	0	3.1	257	12	3	0	3	2	2	5
0	0	3.85	278	0	15	1	4	1	2	1
3	1	3	278	15	20	1	5	1	2	2
1	1	2.41	270	12	20	0	2	1	2	999
1	1	2.41	270	12	20	1	2	1	2	2
0	4	3.48	278	0	22	1	4	1	2	1
0	1	2.7	278	30	10	0	4	2	2	4
2	0	2.765	278	5	4	0	5	2	1	4
0	1	3.9	275	10	20	1	2	2	2	2
2	3	3.64	289	0	18	0	4	1	1	2
2	2	3.35	280	0	41	1	3	1	2	3
2	0	3.4	275	12	20	0	2	2	2	5
3	0	3.63	250	0	12	0	2	1	2	5
1	1	2.6	300	12	18	1	2	2	2	5
2	0	3.35	270	0	43	1	3	1	2	4
2	0	3.3	250	0	6	1	2	1	2	1
0	0	2.9	250	0	5	1	2	1	2	4
1	0	2.6	250	3	8	1	2	1	1	1
0	2	2.9	285	11	10	0	2	1	2	1

For each CI, the report should specify the necessary steps as follows:

1. Specify used confidence level
2. Specify the level: = .05
3. Determine the appropriate formula for the confidence interval
4. Write down your conclusion in detail