Lab session 1 Rep: Questions
Question 1: Prior to 1990 it was thought that the average oral human body temperature of a healthy adult was 37¡ãCelsius (C). Investigators at that time were interested to know if this mean was correct. They gathered a sample of 130 adults and measured their oral body temperature. The dataset, Body_temp.csv, can be downloaded from CANVAS.
a) Calculate all the descriptive statistics.
b) Prepare a boxplot that compares between the seasons.
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c) Comment on the general distribution of the data using your boxplot as your guide.
Have you identified any outliers?
d) Do the t-test for One-sample and two-sample? State your hypothesise test.
e) Find a 95 percent confidence interval on the difference in means. Provide a practical
interpretation of this interval.
f) Draw dot diagrams to assist in interpreting the results from this experiment?
g) Check the assumption of normality of the body temperature for each gender.
h) Find the power of this test for detecting an actual difference in means of -0.25 ¡ãC.
i) What sample size would be necessary to detect an actual difference in means of 0.5
¡ãC with a power of at least 0.85?
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