Statistical Methods 13 Sampling Techniques
Statistical Methods 13 Sampling Techniques Based&on&materials&provided&by&Coventry&University&and& Loughborough&University&under&aNaonal&HE&STEM Programme&Prac9ce&Transfer&Adopters&grant Peter&Samuels& …
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Statistics: 1.1 Paired t-tests - www.statstutor.ac.uk
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Statistical Analysis 5: Chi-squared ( 2) test for 2 …
www.statstutor.ac.uk4 Example 2: Research question: Is there a association between the proportion of defectives and the machine used? A sample of 200 components is selected from the output of a factory that uses three different machines to manufacture these components.
Pearson’s correlation - statstutor
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Statistical Analysis 3: Paired t-test - www.statstutor.ac.uk
www.statstutor.ac.uk3 If we were to do this experiment 100 times, 95 times the true value for the difference would lie in the 95% confidence interval. In our case, the 95% CI is from 0.7 to 3.4. This confirms that, although
Statistics: 2.3 The Mann-Whitney U Test - statstutor
www.statstutor.ac.ukThe exact test and the normal approximation give similar results. We would conclude ... 3 Carrying out the Mann-Whitney U test in SPSS — Choose Analyze — Select Nonparametric Tests — Select 2 Independent Samples — Highlight your test variable (in our example this would be age) and click on the arrow
Statistics: 2.2 The Wilcoxon signed rank sum test
www.statstutor.ac.ukThe Wilcoxon signed rank sum test is another example of a non-parametric or distribution free test (see 2.1 The Sign Test). As for the sign test, the Wilcoxon signed rank sum test is used is used to test the null hypothesis that the median of a distribution is equal to some value. It can be used a) in place of a one-sample t-test b) in place of ...
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