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Correlations and Regression Essay

Words: 625 Length: 2 Pages Document Type: Essay Paper #: 10442438

Correlation & Regression

A fifth grade science teacher wants to know if there is a relationship between final exam scores and overall coursepoints after adjusting for a quiz score.

In order to determine whether there was a significant relationship between overall coursepoints and final exam scores, after controlling for quiz scores, a hierarchical regression was run. All assumptions were assessed using SPSS. There was independences of residuals, as assessed by a Durbin-Watson statistic of 1.08. An examination of various scatterplots indicated a general linear relationship between variables of interest, although perfect linearity was not observed.

Overall Scatterplot

Partial Regression Plot: Final Exam Score & Quiz Score

Figure 3. Partial Regression Plot: Final Exam Score & Course Points

The assumption of homoscedasticity was violated, as the scatterplot in Figure 1 demonstrates (i.e., the values were not evenly spread across the scatterplot). There was no evidence of multicollinearity as evidenced by no correlations between independent variables greater than .7 and no tolerance statistics less than .1. Additionally, no outliers were detected, as evidence by no studentized deleted residuals values greater than +/- 3 standard deviations. An examination of the leverage scores indicated that there were none greater than .5, and as such, no individual cases were exerting high leverage. Furthermore, there were no Cook's distances greater than 1, indicating that there were no unduly influential cases. Although examination of the historgram (Figure 4) indicated less than perfect normality of data, observation of the P-P Plot of Regression Standardized Residuals showed acceptable normality (Figure 5).

Figure 4: Histogram

Figure 5: Normal P-P Plot of Regression Standardized Residual

A hierarchical regression was run in which the quiz score predictor was entered on the first step, followed by the course points predictor on the second. The results of the model indicated that while quiz scores were not a significant predictor…… [Read More]

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Management-Research Question Hierarchy What Are Essay

Words: 1469 Length: 5 Pages Document Type: Essay Paper #: 95778916

It also requires conscious effort at objective because of the inherent of the method applied. Sampling plans narrows its frame to that particular sample, this to shows the group of people who are participating in the study. It samples can be selected through probability and non-probability (Mack & Woodsong, 2005).

Research design

In most cases research design is used in the education sector and it takes different meaning depending with how it's applied. it's normally used interchangeable with the term research method. However, according to Berliner (2002) research design should reflect the whole process of research, starting from the conceptualizing main problem to the question of the research, methods and the conclusion. Identifying a study's research design is important because it communicates information about key features of the study, which can differ for qualitative, quantitative, and mixed methods. However, one common feature across research designs is that at one or more points in the research process, data numbers, words, gestures are collected in different ways and for different purposes.

Critique the survey used for the study.

The survey is built using stratified disproportionate random sampling with subscribers who are considered as to one of 42 cells. In the survey a total of 710 complete questionnaires were sent and received, and in the questionnaires 676 of the respondents indicating that were the people making decision on the purchase for their organization. However, the Penton analyzed on the answers of the 676 buyers, again the data of the study were analyzed by using weighting responses from each cell according to their percentage makeup in overall population. The whole margin error of the survey is indicated as ± 4% at the 95% level of confidence. In more elaborate a good number of follow-up through telephone interviews were conducted with 40 respondents, to gain a deeper understanding of their behavior and attitudes.

Prepare the survey for analysis. Set up the code sheet for this study. How will this study be set up to be tabulated by a statistical analysis program like SPSS?

The analysis of the research will involve the coding of the collected data and then transcribing it. The interviews will be coded and then the outcome analyzed using SPSS. The coding will be done by re-reading the interview and then effectively classifying the relevant information into a series of cells (also known as…… [Read More]

Bibliography:
Berliner, D. (2002). Educational research: The hardest science of all. Educational Researcher, 31(8), 18 -- 20.

Harwell M, (2000). Research Design in Qualitative/Quantitative/MixedMethods
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Respondents of the Study Essay

Words: 2286 Length: 7 Pages Document Type: Essay Paper #: 29390039



Sources of data

*Two literature searches were conducted in order to generate conditions of nurse satisfaction. One search centered on variables of work satisfaction described in relevant job satisfaction theories. The other search probed applicable reviews and meta-analysis for factors of job satisfaction relevant to the nurse profession.

The literature, in the first case, was plumbed for studies that provided theoretical insight into the concept of job satisfaction. Terms such as 'job satisfaction' and 'theory' were used to aid the research.

In the second case, research was conducted by using terms such as 'nursing', 'job satisfaction' and 'factors'. The resulting Meta analyses and literature reviews were thoroughly analyzed and only those relevant to the intent of the study retained. They had to, in other words, be congruent to the nursing profession and related to satisfaction that the employee gained from his or her job.

'Nurse satisfaction' as a result was, accordingly, broken down and defined into the following *ten categories: (1) Workload -- whether staff workload was reduced as a result of the program; (2) Empower -- whether staff felt greater empowerment and ability to do whir work; (3) Support -- whether staff felt that they received more support as a result of the program; (4) Opportunity: whether the program afforded them more opportunity; (5) Stress- whether implementation of program reduced usual levels of stress; (6) Work life- whether work life was enhanced as a result of the program; (7) Leave -- the number of nurses who left since the program was introduced was also evaluated (8) Valuable -- finally, the value of the program to the nurses was considered. (9) Team -- whether staff considered there to be a greater team spirit since program had been introduced (10) Information- whether communication / transmission of information had been enhanced as a result of the program.

Content validity would be estimated as 'adequate' according to the number of these factors incorporated in the final instrument. The fewer the number incorporated and tested, the lower would be the rating of content validity. I therefore aimed that at…… [Read More]

References:
Breakwell, G., Hammond, S. & Fife-Schaw, C. (2000). Research methods in psychology. USA: Sage

European Foundation for the Improvement of Living and Working Conditions (EFILWC). Measuring job satisfaction in surveys - Comparative analytical report. Retrieved on 10/30/2011 from: