1. Sometimes it is difficult to understand data if you do not know what the numbers
represent. Provide short definitions of two words: sepal, and petal (be sure to cite your
sources even if you paraphrase):
Answer
A Sepal is one of the modified leaves comprising a calyx.
Reference: Sepal. In The Merriam-Webster.com Dictionary. Retrieved November 26,
2019, from https://www.merriam-webster.com/dictionary/sepal
Petal: one of the modified often brightly colored leaves of the corolla of a flower.
Reference: Petal. In The Merriam-Webster.com Dictionary. Retrieved November 26,
2019, from https://www.merriam-webster.com/dictionary/petal
2. There is a cumulative relative frequency table printed above for petal lengths (using
rounded values for petal length). Below the number 3 in that table is the number .35.
What does .35 represent? (multiple choice)
a. Three of the flowers had petal length of 0.35.
b. There were 0.35 observations that had petal length of 3 (after rounding the petal lengths).
c. Of all the flowers measured in this sample 35% had a petal length of 3 (after rounding the
petal lengths).
d. Of all the flowers measured in this sample 35% had a petal length of 3 or less (after
rounding the petal lengths). - Answer
e. A study of all flowers on the planet would show that about 35% had petal lengths of 3 or less
(after rounding the petal lengths).
3. Using only the cumulative relative frequency table printed above combined with some
simple paper-and-pencil calculations, which petal length occurs most frequently?
In order to BETTER answer this, I just pushed the relative frequency rounded to 0 decimals
back. You will find out that, if we just pick the accumulated relative frequency for 2 minus the
one for 1, we will get the frequency for 2, and so for, as shown below.
> rel.rfreq
x
1 2 3 4 5 6 7
0.16 0.17 0.02 0.23 0.23 0.16 0.03
