Random samples of two species of iris gave the following petal lengths (in cm). x1, Iris virginica 5.8 5.9 4.5 4.9 5.7 4.8 5.8 6.4 5.3 5.9
x2, Iris versicolor 4.5 4.9 4.7 5.0 3.8 5.1 4.4 4.2

Required:
a. Use a 5% level of significance to test the claim that the population standard deviation of x1 is larger than 0.55.
b. What are the degrees of freedom?
c. Find a 90% confidence interval for the population standard deviation of x1.
d. Find the value of the sample F statistic.

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.

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