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The utilities data set contains information from utilities bills for a personal residence over a number of years. This problem explores gas usage over time.
a) Make a scatterplot of gas usage (ccf) vs. time. You will need to combine month and year to get a reasonable measurement for time. Such a plot is called a time series plot.
b) Use the groups argument (and perhaps type=c('p','l'), too) to make the different months of the year distinguishable in your scatterplot.
c) Now make a boxplot of gas usage (ccf) vs. factor (month). Which months are most variable? Which are most consistent?
d) What patterns do you see in the data? Does there appear to be any change in gas usage over time? Which plots help you come to your conclusion?
Compare methods of assessing body weight and composition. Contrast different approaches to weight loss based on safety and effectiveness. Show how dietary requirements change in response to physical activity level.
Find the probability of making at least 15 questions correct, if student guesses on each question.
the number of power surges at a nuclear plant follows a poisson distribution with an average of .5 power surgers per
In your words, demonstrate your understanding on the following concepts:
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Compare the Black Death in the Middle Ages with the Cholera epidemics in the 19th century. In what ways were they similar?
In a goodness-of-fit test where the sample size is 200, there are 5 categories, and the significant level in .05. The critical value of X2 is.
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