Simple linear regression - statstutor
Simple linear regression Introduction Simple linear regression is a statistical method for obtaining a formula to predict values of one variable from another where there is a causal relationship between the
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Statistics: 1.1 Paired t-tests - www.statstutor.ac.uk
www.statstutor.ac.ukNOTE: Forthistesttobevalidthedifferencesonlyneedtobeapproximatelynormallydistributed. Therefore, it would not be advisable to use a paired t-test where there were ...
Statistical Analysis 9: Some reliability measures
www.statstutor.ac.uk1 Statistical Analysis 9: Some reliability measures Research question type: Reliability of repeated measurements What kind of variables? Continuous (scale/interval/ratio) ...
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
www.statstutor.ac.ukCorrelation coefficient Pearson’s correlation coefficient is a statistical measure of the strength of a linear relationship between paired data.
Statistics: An introduction to sample size calculations
www.statstutor.ac.ukStatistics: An introduction to sample size calculations Rosie Cornish. 2006. 1 Introduction One crucial aspect of study design is …
Statistical Analysis 8: Two-way analysis of variance …
www.statstutor.ac.uk1 Statistical Analysis 8: Two-way analysis of variance (ANOVA) Research question type: Explaining a continuous variable with 2 categorical variables What kind of variables?
Statistical Methods 13 Sampling Techniques - statstutor
www.statstutor.ac.ukStatistical Methods 13 Sampling Techniques Based&on&materials&provided&by&Coventry&University&and& Loughborough&University&under&aNaonal&HE&STEM
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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