A researcher investigating a new product for clearing up acne selects a random sample of 13teenagers, and measures the amount of acnes they have. Afterwards, the researcher gives theparticipantsthe facial product to use, and asks that they report backafter 15 days of use. At theend, the researcher measures the acne numbers again and records the difference(after use minusbefore use).The results (in counts) aregiven below. Xi: -20, 8, 6, -14, -15, -14, 0, 1, 3, -7, -15,-4, 9
d.Report on the central tendencyby calculating the mean, median, mode.
e.Report on the variabilityby calculating therange, variance, and standard deviation.
f.Report on the kurtosis and skewness of the data.