The cost of an electrical gadget and the cost of a plumbing material were in the ratio 8:6 last year ,this year each cost was re
duced by GHÇ 4.00 and their ratio changed to 7:5 respectively . Taking the Initial cost of the electrical gadget to be GHÇp Calculate the value of p and q
1 answer:
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Answer:
95% confidence interval for the population standard deviation of the lifetimes of the batteries produced by the manufacturer.
(8.889, 11.7106)
Step-by-step explanation:
<u><em>Step(i)</em></u>:-
Given sample size 'n' = 23
Mean of the sample x⁻ = 10.3
Standard deviation of the sample (s) = 2.4
Level of significance = 0.05
Degrees of freedom = n-1 = 23-1 =22
<u><em>Step(ii)</em></u>:-
95% confidence interval for the population standard deviation of the lifetimes of the batteries produced by the manufacturer.
(10.3 - 2.8188 (0.50043) , 10.3 + 2.8188(0.50043)
(10.3-1.4106 , 10.3+1.4106)
(8.889, 11.7106)
<u><em>final answer</em></u>:-
95% confidence interval for the population standard deviation of the lifetimes of the batteries produced by the manufacturer.
(8.889, 11.7106)