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Answer:
Please the attached file for the answer. I hope that helps
Answer:

Step-by-step explanation:
We are given the following in the question:
Sample size, n = 67
Variance = 3.85
We have to find 80% confidence interval for the population variance of the weights.
Degree of freedom = 67 - 1 = 66
Level of significance = 0.2
Chi square critical value for lower tail =

Chi square critical value for upper tail =

80% confidence interval:

Putting values, we get,

Thus, (3.13,4.91) is the required 80% confidence interval for the population variance of the weights.
Answer:
The first, third and last one are true
Answer:
18 inches or 1 foot 6 inches/1 foot and a half
Step-by-step explanation:
one foot is 12 inches long so you take the number of feet given (7—we'll worry about the half later) and multiply by the number of inches that are in a foot (12)
7×12=84
then half a foot is 6 inches so 84+6=90 inches
then we take 90 and divide it by 5 (to get the length of one piece)
90/5=18 inches
you can keep it as 18 inches or convert it into feet which you subtract 12 from 18, and you have 6 inches left which is 1 foot and a half