Tutorial Class 2
Q1: For the following sample: 5,8,6,3,2,6,9,6,9,
compute the following statistics: mean, median,
mode, range, inter-quantile range, variance,
standard deviation, coefcient of variation.
Sort the data: 2,3,5,6,6,6,8,9,9
Example 1. Approximating a Binomial Probability
Twenty-nine percent of Americans say they are confident
that passenger trips to the moon will occur during their
lifetime. You randomly select 200 Americans and ask if he
or she thinks passenger trips to the
Variable and Data
A variable is an object, characteristic or property
that can have different values.
A variable may differ from one member of a
population to the next.
Examples: peoples weight, age, gender, blood
A variable can be either quant
Large quantities of data are hard to interpret and
Need some statistical techniques to make them more
We can use frequency distribution and cumulative
frequency distribution to summarize the the da
Use descriptive statistics to describe the central
tendency and variation of individuals of the population.
Measures of central tendency: mode, median, mean.
Measures of Dispersion: range, standard deviation,
coefcient of variation.