# Two Statistical Methods - Essay Example

Summary
Statistical methods have evolved over a period to time to address specific needs of industries, governments and society at large. Statistical studies follow either the experimental or the observational path. Whatever be the approach or study that is taken up, the analysis of the data is done using any of the number of statistical methods that are available…

## Extract of sample "Two Statistical Methods"

Download file to see previous pages This distribution is a theoretical method used normally to have the goodness of fit of an observed statistic to a theoretical model and the degrees of freedom that it is calculated to. The chi-square is used to test both of these parameters. Most often this is used in specifically to address the issues relating to proportion of population. Two chi-square tests are comfortably used; one, test for goodness of fit and two, test for independence2.
Analysis of Variance provides the methodology to analyses a dependent variable and the effect of other interval independent variables on the values of the dependent variable. ANOVA (Analysis of Variance) may be One-way ANOVA when the effect of one independent variable is measured. However, effects of multiple interval independent variables can be measured. This helps in substantiating the 'main effects' and the 'interaction effects'3.
Main effects bring out the direct variation in the dependent variable due to every single independent variable. Whereas, the interact effect brings out the combined effect of the independent variables on the dependent variable. This is normally analyzed in various combinations. ...Download file to see next pagesRead More
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## CHECK THESE SAMPLES OF Two Statistical Methods

### Quantative Methods (Statistical Analysis)

...be found acceptable. The different types of sampling methods are Single sampling: these plans are the simplest, in that they require a ratio sample to be drawn at random from the lot and tested. If the number of non – confirming units is less than the pre-set limit, the lot is accepted. It the number is higher, the lot is rejected. Double sampling. These plans require one sample to be drawn; which is tested. There are two preset limits for how many non – confirming units may be found; these divide the possibility of errors into three parts. If errors are less than the lower limit, the lot is accepted, while if they are more than the higher limit, it is rejected. If the number falls in between, then the...
8 Pages(2000 words)Assignment

### Statistical Methods

...be calculated from the test statistic for appropriate test. For Q1, the standard normal distribution test statistic is. (96.4 - 100) / (14/5) = -1.286 From Z tables of standard normal distribution, P (Z -1.286) = 1 - P (Z 1.286) = 1 - 0.89973 = 0.10027 Since we are conducting two tailed test, the associated p-value is 0.10027 2 = 0.20054. Since this is much higher than 0.05, we have insufficient evidence to reject H0. For Q2, the t-distribution test statistic is (96.4 - 100) / (18 / 5) = -1 From the t-distribution tables, P (t24, 0.025 -1) = 0.15 Since this is one sided, 0.15 2 = 0.3. This is also higher than 0.05 and hence we have insufficient evidence...
8 Pages(2000 words)Math Problem

### Statistical Methods Assignment

...Pr {- 2.3355 < Z < 2.3355} = 0.9808 : 0.05 p = 2*0.0096 = 1 - 0.9808 = 0.0192 The test shows that there is a significant statistical difference between the sample mean and the hypothesized mean, on a 95% confidence level. We, therefore, reject the null hypothesis. Question 6 sample size 121 degree of freedom 120 sample mean 47.50 critical t 1.658 sample standard deviation 7.50 90% confidence interval (46.37, 48.63) Assuming that the population standard deviation is equal to the sample standard deviation, the confidence interval becomes: (46.38, 48.62) The two intervals do not seem to have a significant difference between them. This is a result of having a large sample...
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### Statistical Methods In Psychology

...Article Review Synopsis Article: Statistical Methods in Psychology Journals: Guidelines and Explanations. Published in American Psychologist. Vol. 54, No. 8, 594–604 Written by Leland Wilkinson. The article takes the ongoing dispute over the applications of significance testing in psychology journals into consideration. The article was motivated greatly by the publication of Cohens (1994) article, the Board of Scientific Affairs (BSA) of the American Psychological Association (APA) convened a committee called the Task Force on Statistical Inference (TFSI) whose charge was "to elucidate some of the controversial issues surrounding applications of statistics including...
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### Comparison between two methods

...Comparison between two methods SSADM AND MERISE TECHNIQUES by Introduction This report presents the SSADMtechniques through NIMSAD analysis and finds out the main qualities of this system molding technique. The second main part of this report is regarding the MERISE technique for the better system modeling and design. This research is basically aims to discuss these two methods regarding the enhanced system development and modeling. SSADM comprises a series of design regulations and procedures that upholds software precision and cleanness, by this means minimizing the time and endeavor essential for coding, debugging and continuation. The most important rule of SSADM is...
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### Statistical Quantitive Methods

...I a) Two dice are rolled together what is the probability of getting a number on the second die so that the total of the numbers on the two dice is more than 10, given that the first is showing a 6. Answer Let the probability of getting a 6 in the first die be A Let the probability of getting number 4 or higher in the second die be B P (A) =1/6 P (B) =3/6 The conditional probability P (B│A) =  P (A ∩ B) =P (A).P (B) =1/6 X 3/6 = 3/36 Therefore P (BI A) =3/36 x6 =1/2 b) A service station has one pump for unleaded petrol, which (with an attendant) can service 10 customers per hour. Cars arrive at the unleaded...
4 Pages(1000 words)Essay

### Doctoral statistical methods

... with the babies. These include the hearing ability, brain development, the general mood and appetite of the infant. Qualitative readings are represented scientifically in histograms, graphs and charts (Chiang 2003). However, quantifiable data are summarized to measure the correlation, variability and central tendencies. Merging of the two methods in a mixed approach provides a comprehensive answer that determines the responses of speech and language amidst infants. Reference Chiang, C. L. (2003). Statistical methods of analysis. New Jersey, NJ: World Scientific... Doctoral statistical methods Task Doctoral Statistical Methods Statistical...
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### Statistical Methods

.... This corresponds to the results from the Anova, regression and correlation results. It is worth noting that this maybe so because hotel industry is ‘predominated’ by female workers. Bibliography Snedecor, G. W., & Cochran, W. G. (1989). Statistical methods. Ames: Iowa State University Press. Freund, R. J. (2010). Statistical Methods, Students Solutions Manual (e-only). Burlington: Elsevier Science. APPENDIX: RESULTS Gender of Respondent Frequency Percent Valid Percent Cumulative Percent Valid Male 96 47.8 48.0 48.0 Female 104 51.7 52.0 100.0 Total 200 99.5 100.0 Missing System 1 .5 Total 201 100.0 Employer of Respondent Frequency Percent Valid Percent Cumulative...
11 Pages(2750 words)Assignment

### Statistical Methods in Psychology

...Chapter 7 Questions. Exercises 4. An industrial psychologist obtains scores on a job-selection test from 41 men and 31 women with the following results: Men M= 48.75 (SD =9.0); Women M = 46.07 (SD = 10.0). Test the difference for the significance at both the .05 and .01 levels (two-tailed). Determine the effect size for the difference of these two sample means. Does this effect size seem to be large or small? 10. Suppose that you have read the following sentence in a psychology journal: “The experimental group obtained a higher score on the recall task (M= 14.7) than did the control group (M=11.1), and this difference was statistically significant, t (38) =2.3, p < .05.” Assuming the...
3 Pages(750 words)Assignment

### Statistical Methods in Economics

...Statistical Methods in economics Statistical Methods in Economics How long are bicycles hired for (on average) onthe Santander London Bicycle Hire scheme? With the increasing heavy traffic and the ever increasing economy of London, there is need to find an alternative method to ease the heavy traffic witnessed in London. In fact according to Godwin (2004) the leading cause of traffic congestion is because the roads are full and close to the maximum capacity. In connection to this, a few years ago Santander Bicycle scheme was introduced by London so as to give people opportunity to hire bicycles from various docking stations in London. This was also intended to improve people’s fitness and reduce traffic congestion within the city... . The...
4 Pages(1000 words)Coursework