A company applies an aptitude test to all those who apply for work as programmers. The...

A company applies an aptitude test to all those who apply for work as programmers. The results of these tests are analyzed according to their precedence (general advertising, advertisements for specialized magazines, employment agencies, personal recommendations or people who come spontaneously). With a significance level of 0.025, determine if there is a difference between the results of these tests according to their precedence.

Your work should have detailed procedure, in this exercise you can use the tool offered by Excel for the required test, but you have to have the appropriate analysis.

General Pub	36	47	38	51	62	78	60	47	49	53	26	38	61	39	43
Rev Esp.	58	64	62	47	71	90	65	82	61	59
Ag Emp.	47	59	48	81	66	50	42	53
Rec Per.	67	61	82	97	65	72	54	59	58
Spontaneous	38	47	80	41	38	66	50

Expert Solution

The appropriate test is one way ANOVA as five groups are involved in the study.

The statistical hypothesis is,

Ho: There is no difference between the test results according to the distinct five precedence. Ha: There is a difference between the test results according to the distinct five precedence.

Perform the test in Excel:

Enter the data in the Excel spreadsheet.

Go to data analysis add-in in the DATA tab. Select ANOVA:single factor and click OK.

Enter range of the entire data set. Select the labels and enter the output range. Click Ok.

The obtained output is shown below:

Anova: Single Factor

SUMMARY
Groups	Count	Sum	Average	Variance
General Pub	15	728	48.53333	169.6952
Rev Esp.	10	659	65.9	152.9889
Ag Emp.	8	446	55.75	159.9286
Rec per.	9	615	68.33333	186
Spontaneous	7	360	51.42857	253.2857


ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups	3248.561	4	812.1401	4.53488	0.003736	2.583667
Within Groups	7879.848	44	179.0874

Total	11128.41	48

Decision: Since the p-value (0.003736) is less than the significance level 0.025, so the researcher rejects the null hypothesis.

Conclusion: There is a sufficient evidence to support that there is a significant difference between the test results according to the distinct five precedence.

orchestra answered 1 year ago

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