ariannapenny98

20.03.2021 • 

Mathematics

The personnel department of a large corporation wants to estimate the family dental expenses of its employees to determine the feasibility of providing a dental insurance plan. A random sample of 12 employees reveals the following family dental expenses (in dollars): 115, 370, 250, 593, 540, 225, 177, 425, 318, 182, 275, and 228. a.Construct a 90% confidence interval estimate for the standard deviation of family dental expenses for all employees of this corporation.

b.
Construct a 95% confidence interval estimate for the standard deviation of family dental expenses for all employees of this corporation.

c. Construct a 99% confidence interval estimate for the standard deviation of family dental expenses for all employees of this corporation

Ответ:

breemills9552

19.04.2021

Mathematics

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Solution :

a). Given :

a = ,

chisquare with the ,

is (from the chisquare table)

Chisquare with the , df  = is (from chisquare table)

So 90% Cl is

b). Given :

a =

Chisquare with

df = is A,

Chisquare with , df = 11 is

So, 95% Cl is

c). Given a = , chisquare with , df = is

Chisquare with , df  = is

So 99% CI is

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Ответ:

jordenlehman

03.01.2021

Mathematics

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1 whole section is shaded...so thats 100%
25 out of 100 in the other boxthats 25%

so u have 125% that is shaded

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