Statistics is a very vital tool when it comes to decision making in research. Decisions in various research studies are supposed to be guided by figures and not observations or opinions. For example, an individual who wants to establish a shoe manufacturing company must know which sizes of shoes to produce in large numbers and which ones to be produced in low quantity. To be able to know this, he will be forced to conduct a sample survey since it is not possible to establish the size of shoes everyone in the entire population is wearing. It is from this sample survey that test of hypothesis will come in handy to guide whether the results of the sample survey are a representative of the whole population. If the results of the sample survey are supported by the test statistic, then the company will now be able to produce a given size of shoe as guided by the test result. If the test establishes that there is no significant difference between the mean shoe size of the sample and the total population, then that size is produced in great numbers to enable the company maximize on its revenue. This introduction is just to shed light on the importance and role of a hypothesis test. It is against this background that this research paper seeks to conduct research on the birth weights of babies born to mothers who are non-smokers who are below the age of 32 years and apply hypothesis tests to help in making conclusions.
Gestation period(months) Birth weight in grams
... middle of paper ...
...observed from the frequency distribution graph above that the weights were normally distributed. In general we can conclude that the weights are normally distributed as the curve appears to be balanced. In other words it is neither skewed to the right or to the left.
Hypothesis tests like have been used in the application of this project, are fun and easy to use. However, one key issue that must be done with caution is choosing the test statistic to use in a given test of hypothesis because not all of them are the same. The hypothesis of a chi square test will differ from that of one sample test and so on. Similarly when it comes to decision rule, different test statistics will have different criteria. For example in some tests you will reject the null hypothesis when alpha is less than the significance level while in other tests it will be the opposite.
Need Writing Help?
Get feedback on grammar, clarity, concision and logic instantly.Check your paper »
- This chapter presents the methodology applied in the evaluation. It discusses the evaluation approach, evaluation design, evaluation period, study population, unit of analysis, variables and their measurements, sample size and sampling techniques, types and sources of data, data collection methods, validity issues, data management and analysis methods and ethical issues. 3.2 Evaluation approach According to Görgens-Albino and Kusek (2009), there are several evaluation approaches which include formative, process, outcome, economic and impact evaluation.... [tags: Evaluation, Evaluation methods]
1042 words (3 pages)
- In a continuation of the Springdale Shopping District Survey, use of confidence intervals is introduced to improve upon the evaluation of the quality of the statistics derived from the survey of a sample population. There has historically been an assumption that the respondents represent a simple random sample of all potential respondents within the community and that the population is large enough that application of the finite population correction would not make an appreciable difference in the results.... [tags: statistics, confidence interval, sample population]
905 words (2.6 pages)
- The needs of what is being addressed by an evaluation, whether is a program or a problem, determine what evaluation theory or model is going to be used. Each evaluation is unique and there are many different theories and models for an evaluator to pick from, but each evaluator has a basic model they may start out with. I did an interview with an experienced evaluator, Person A, who explained that every evaluation and assessment is unique so she used a variety of different theories depending on the evaluation.... [tags: Evaluation, Evaluation methods, Model theory]
1069 words (3.1 pages)
- Satisfaction Survey Research Current Survey Background Perhaps no other research tool utilized by social scientists is as sensitive to social and technological change as the sample survey. Survey research is a multibillion dollar industry in the United States. Surveys provide critical information to decision-makers in government and business. Polls and their results are widely discussed by the general public and media. Because of the size, complexity, and expense of major surveys, which can include tens of thousands of respondents and exceed $100 million in cost, surveys inevitably come to reflect social and technological change.... [tags: Survey Research Market]
1472 words (4.2 pages)
- 2.1 Introduction This chapter describes the aim of survey, objectives, methodologies, scope limitations, justification, ethical and professional issues, and project risks and mitigation of the survey. The main survey is on data patterns in RMIS. 2.2 Aims and objectives of the study 2.2.1 Aim The aim of the survey is to extract interesting patterns from data held in RMIS at JKUAT 2.2.2 Objectives i. To carry out data pre-processing in order to define data held in RMIS. ii. To identify suitable mining tools and techniques for data mining analysis iii. To carry out data mining for interesting patterns from analysis of data held at RMIS iv. To establish the advantages of the pattern survey re... [tags: Data mining, Data analysis, Data]
1204 words (3.4 pages)
- Introduction The definition of American Community Survey (ACS) by the U.S. Census Bureau is “an ongoing survey that provides data every year and giving communities the current information they need to plan investments and services . All rights reserved. Used here for educational purposes only." The American Community Survey intended to deliver the most recent demographic, economic, social, and housing evaluation during the years. The ACS is a part of the U.S. Census Bureau and they save some information every year that is approximately in more than 40 different topics.... [tags: U.S census, data, master address file]
928 words (2.7 pages)
- Sample and Design For compiling literature review, a comprehensive research study was completed using various different types of sampling. Feng & Liu (2009) used a convenient sample of 205 nurses in 17 units at a local tertiary teaching hospital in Northern Taiwan was involved and completed a user evaluation questionnaire. Two article using stratified systematic sampling used one article by Kumakech, Achora, Berggren, & Bajunirwe (2011) to select the participants from sample size of 384 participants where self-administered questionnaire was given to 224 participants (including 98 HCWs and 126 students) in Mbarara Hospital, Uganda.... [tags: Sampling, Stratified sampling]
1643 words (4.7 pages)
- 1. Research Question From the research report " A comparison of attitudes toward meat and animals among strict and semi-vegetarians", Rothgerber poses a question that asked why individuals who define themselves in vegetarian category but behave inconsistently from vegan’s membership criteria that is consuming animal product. 2. Research method a) This study uses internet survey which is a survey research design. The goal is to obtain a description of particular group of individuals who are under the variables as vegetarian and semi-vegetarian.... [tags: Sampling, Sample, Sample size, Vegetarianism]
1500 words (4.3 pages)
- Theoretical Framework I chose an article from the University of Arizona’s library titled Use of Survey Research in Top Mass Communication Journals 2001-2010 And the Total Survey Error Paradigm. This article was a little confusing, in my opinion, but I am happy I took communications 228 prior, because it helped me to understand the concepts. This article explained to me how you have to make the very most out of all the survey data you collect no matter if it was cost free or expensive. Survey error is a main point here, because think how many people in this country that are registered to vote, verse the people that actually do.... [tags: Sampling, Sample, Sampling error, Sample size]
830 words (2.4 pages)
- The stakeholders in this evaluation are the consumers with disabilities of the VR (vocational rehabilitation) program, family members, staff, agency administrators, leaders of the groups who advocate for individuals with disabilities and case managers. The goal of the program being evaluated is to give as many opportunities as possible for clients with disabilities to experience with full social and economic benefits from being .They want measures of effectiveness and qualitative indicators of the important outcomes.... [tags: Business Analysis]
1230 words (3.5 pages)