The number of days required for two suppliers to deliver orders is as follows. Supplier A: 11 10 9 10 11 11 10 11 10 10 Supplier B: 8 10 13 7 10 11 10 7 15 12 Where, the average number of days required for supplier A to deliver orders = 10.3 days and Standard Deviation = 0.67 day Which supplier provides more consistent and homogenous delivery times A or B? Justify your answer. And do you think the delivery time for each supplier is symmetric. Support your answer with a proper test for skewness.
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
The number of days required for two suppliers to deliver orders is as follows.
Supplier A: |
11 |
10 |
9 |
10 |
11 |
11 |
10 |
11 |
10 |
10 |
Supplier B: |
8 |
10 |
13 |
7 |
10 |
11 |
10 |
7 |
15 |
12 |
Where, the average number of days required for supplier A to deliver orders = 10.3 days
and Standard Deviation = 0.67 day
- Which supplier provides more consistent and homogenous delivery times A or B? Justify your answer.
And do you think the delivery time for each supplier is symmetric. Support your answer with a proper test for skewness.
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