401077 Introduction to Biostatistics, Autumn Assignment 1

401077 Introduction to Biostatistics, Autumn 2020
Assignment 1 (Due Sunday March 29, 2020)
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Your name:
Your student number:
Question 1 (2 marks)
a) Heart rate of a patient is always measured numerically. Hence, it is a quantitative
variable.
b) Student ID is a unique number which is constant. Hence, it is not a variable.
Question 2 (4 marks)
a) Here a histogram and a boxplot are drawn to show the frequency distribution of
serum total cholesterol.

Graph 2.1
Graph 2.2
b) The summary statistics for the variable serum total cholesterol is given below.
Summary statistics of serum total cholesterol
Mean SD
IQ
R Skewness Min Q1 Q2 Q3 Max n NA
237.38 41.24 55 0.71 148 210 232
26
5 496 309 4

It can be observed that the mean serum total cholesterol is 237.39mg/dL with
standard deviation 41.24. The minimum and maximum values of the variable are 148
mg/dL and 439mg/dL. The median shows that 50% patients have serum total
cholesterol less than 232mg/dL. The median is less than mean and the skewness is
also positive. Hence, it can be concluded that the distribution of serum total
cholesterol is positively skewed.
Question 3 (3 marks)
Here a bar graph is drawn to visualize the frequency distribution of the education
level of patients.
Graph 3
The graph shows that most of the people have studied for 0-11 years. There are very
few people who have college degree. The graph shows that the frequency distribution of the
education level is positively skewed.