Description of the distribution of a metric variable The distribution of house prices in a sample of 542 South Australian houses is displayed in Figure 1. The distribution is positively skewed with 50% of houses priced at $430,000 or less. Typically house prices were between $390,000 and $550,000 with half of the house prices falling within this range. Two houses had exceptionally high prices of $1,030,000 and $1,050,000. DV=Outcome / IV=Explanatory 125 100 Frequency 75 Relative Risk: (total) a/b//c/H=RR. For the sample, people who ... were 1.2 times more likely to be diagnosed with .. 400 BOO 1000 House prices in $1000 Figure 1 Distribution of house prices. The distribution of time taken to travel to work in a sample of 250 Australian workers is displayed in Figure 1. The distribution is approximately symmetric and the average travel time was 20 minutes (s = 5). Typically travel times were between 17 and 24 minutes with half of the travel times falling within this range. (1s=68%,2s=95%,3s=99.7%) 25. 20 15- Frequency 10. 5 Odds Ratio: a/b//c/d=OR. For the sample, the odds of being ... 0 10 15 20 5 25 30 35 Time to travel to work (Minutes) were 5.4 times the odds of being ... Figure 1: Distribution of travel times to work Description of the distribution of categorical variable The distribution of main use of mobile phone for a sample of 98 Expencitel customers is displayed in Figure 1. The most common primary use was to send SMS messages (53%), but making phone calls was also a common response (43%). Very few people said that the primary use for their phone was either taking photographs or listening to mp3 files. 50 40 Percent 30 - 20 10 phora cualla photographs Mobile most used for Figure 1: Primary use of mobile phone One Sample t-test (Comparison with previous recorded metric #) A study was conducted to investigate whether the age of tourists in Katatonia has increased since 1995. In a random sample of 250 tourists in Katatonia, the average age was 47.77 years (s = 15.41 years). This is higher than the average age of 45 years recorded in 1995, and one-sample t-test shows that this difference in mean age is significant, t(249) = 2.84, p = . 005. The 95% confidence interval indicates that since 1995 the average age of tourists has increased between 0.85 and 4.69 years. As expected, the age of tourists in Katatonia has increased since 1995. A study was conducted to investigate whether the age of tourists in Katatonia has increased since 1995. In a random sample of 250 tourists in Katatonia, the average age was 41.43 years (s = 15.93 years). This is lower than the average age of 45 years recorded in 1995, and a one-sample t-test shows that this difference in mean age is significant, t(249) = 3.55, p < . 001. The 95% confidence interval indicates that since 1995 the average age of tourists has decreased by between 1.59 and 5.56 years.