A proper fraction never has the same value as a mixed number.
1 answer:
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Answer:
Case a Case b
margin of error 0.0216 0.0231
Interval estimate (0.7016 , 0.6795) (0.5031 , 0.4569)
margin of error is not same in both cases.
Step-by-step explanation:
a
At 95% confidence interval the interval estimate of number of 20 year old drivers in year A can be computed as
p' ± z
= 0.68 ± 1.96
= 0.7016 , 0.6795
the margin of error can be written as
z
= 1.96
= 0.0216
b
At 95% confidence interval the interval estimate of number of 20 year old drivers in year B can be computed as
p' ± z
= 0.48 ± 1.96
= 0.5031 , 0.4569
the margin of error can be written as
z
= 1.96
= 0.0231
c
Sample size is same in case A and B but proportion is different in both cases so margin of error is different in both cases
Answer: 1800
Step-by-step explanation:
Given : A certain system has two components.
Number of different models of the first component = 6
Number of different models of the second component = 10
A salesman must select 2 of the first component and 3 of the second to take on a sales call , so we use combinations ( ∵ order of selection not matters)
The number of different sets of components can the salesman take =
Hence, the number of different sets of components can the salesman take = 1800