(2.88 10^4) x ( 4x10^5)
2 answers:
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Answer: (-0.620, 0.220)
Step-by-step explanation:
The formula to find the confidence interval for the difference in true proportion of the two groups. is given by :-
, where = Sample size for first group.
= Sample size for second group.
= Sample proportion for first group.
= Sample proportion for second group.
z* = critical z-value.
Let first group be "group of prototypes by first process " and second group be "group of prototypes by second process".
= Proportion of defectives in the first batch.
= Proportion of defectives in the second batch.
From question , we have
,
,
,
By z-table , Critical value for 95% confidence interval is z* =1.96.
Substitute all values in formula , we get
Hence, a 95% confidence interval for the difference in the proportion of defectives is (-0.620, 0.220).
Answer:
Martha can buy 7 packs of socks.
Step-by-step explanation:
Martha has $53
Shoes = $42
Socks = $1.50 each
First subtract 42 from 53 to figure out how much is left:
⇒ $53 - $42 = $11
then divide the answer by how much each pack of socks cost:
⇒ = 7.33
next, take the whole number of the answer and multiply that by $1.50 to figure how much 7 pack of socks cost:
⇒ 7 socks x $1.50 = $10.50
subtract the answer from $11 to figure out how much remains:
⇒ $11 - $10.5 = $0.50
X Y
_______
-2 0
-1 -1
0 -1
1 -1
2 0
