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Statistics: Boxplot and confidence interval

  1. Oct 28, 2011 #1
    1. The problem statement, all variables and given/known data
    I'm doing a past paper for my statistics course, and there's no provided solutions. I want to know if my attempt is correct. This is part of the paper:

    2. Relevant equations

    3. The attempt at a solution
    i) Q0 = 1.06, Q1 = 1.335, Q2 = 2.04, Q3 = 2.275, Q4 = 2.64

    ii) IQR = Q3 - Q1 = 0.94
    IQR x 1.5 = 1.41
    Outliers outside: [Q1 - 1.41, Q3 + 1.41] = [-0.075, 3.685]
    Therefore no outliers.

    iii) Skewed to the left

    iv) 1.8810 ± 1.906 [(0.5239)/sqrt(20)]
    = [1.6577, 2.1043]

    v) Assumed it is a normal distribution.

    Apart from the missing boxplot, are these correct?
  2. jcsd
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