Here I am using Minitab 18.
(a)
(b) Interquartile Range (IQR) is measure of dispersion of a data set. It measures the spread of the distribution of the data set.
If a data point lies below (Q1-1.5*IQR) and above (Q2+1.5*IQR), then the data point would be considered as an outlier.
(c) Standard Deviation is also a measure of dispersion. From the given data set the SD is 0.793, which means that on an average all the data points are deviated from the mean by 0.793
(d) The skewness is 0.15, indicating moderately positively skewed. It means that right tail is longer (frequency curve). Also we have noticed that mean < median which is typically occurred for a negative skew distribution. So, overall we say that the distribution is more or less symmetric.
(e)
the 150 stores in the sample, (19 were from Western Australia. Below are the percentage increases in the cost of t...