Statistics Cheat Sheets

G036 * Yes because the p-value is less than 0.05 or No, because the p-value is greater than 0.05 * The coefficient of variation is the standard deviation of a data set, divided by the mean of the same data set. * Z score = x -ms * The Independent part is what you, the experimenter, changes or enacts in order to do your experiment. The dependent variable is what changes when the independent variable changes - the dependent variable depends on the outcome of the independent variable. * P=000=P<0.001 * Repeated measure = A repeated measures design is a longitudinal study, usually a controlled experiment but sometimes an observational study * We can be 95% confident that on average shoppers at CyberChic are between 3.37 years younger than customers at Modern Miss and 0.75 years older. * Value of r Strength of relationship -1.0 to –0.5 or 1.0 to 0.5 Strong -0.5 to –0.3 or 0.3 to 0.5 Moderate -0.3 to –0.1 or 0.1 to 0.3 Weak –0.1 to 0.1 None or very weak

One sample t-test
A study was conducted to investigate whether the hours of work has changed for Australian men since 2001.
In a sample of 116 Australian male adults, on average the men worked 39.6 hours per week (s = 4.5). This is higher than the mean of 38.6 hours per week recorded for Australian men in 2001 and a t-test shows that the difference is significant, t (115) = 2.45, p = 0.016. The 95% confidence interval indicates that since 2001 the average hours of work has increased between 0.20 and 1.85 hours/week.
As expected, the average hours of work has changed. On average Australian men now work for longer hours than in 2001.
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A study was conducted to investigate whether the age of tourists in Katatonia has increased since 1995.
In a sample of 250 tourists in Katatonia, the average age was 41.56 years (s = 15.89). This is lower than the average age of 45 years recorded in 1995 and a t-test shows that the difference is significant, t(249) = 3.42, p = 0.001.