The following data represent petal lengths (in cm) for independent random samples of two species of Iris. Petal length (in cm) of Iris virginica : x 1 ; n 1 = 35 5.3 5.6 6.1 6.1 5.1 5.5 5.3 5.5 6.9...


The following data represent petal lengths (in cm) for independent random samples of two species of Iris.



Petal length (in cm) of
Iris virginica:
x
1;
n
1
= 35












































5.35.66.16.15.15.55.35.56.95.04.96.04.86.15.65.1
5.64.85.45.15.15.95.25.75.44.56.45.35.56.75.74.9
4.85.85.2



Petal length (in cm) of
Iris setosa:
x
2;
n
2
= 38















































1.41.91.41.51.51.61.41.11.21.41.71.01.71.91.61.4
1.51.41.21.31.51.31.61.91.41.61.51.41.61.21.91.5
1.61.41.31.71.51.7


(a) Use a calculator with mean and standard deviation keys to calculate x1,
s
1, x2, and
s
2. (Round your answers to two decimal places.)



















x1
=

s
1
=
x2
=

s
2
=


(b) Let μ1
be the population mean for
x
1
and let μ2
be the population mean for
x
2. Find a 99% confidence interval for μ1
− μ2. (Round your answers to two decimal places.)











lower limit
upper limit



Jun 10, 2022
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