Answer:
Margin of error at 90% is 0.024
Margin of error at 99% is 0.037
Step-by-step explanation:
Sample size = 1076
A poll found that 64% of a random sample of 1076 adults said they believe in ghosts.
So, No. of adults said they believe ghosts = 
So, x = 688
n = 1076




z at 90% confidence is 1.64


So, margin of error at 90% is 0.024
Find the margin of error needed to be 99% confident.
z at 99% confidence is 2.58


So, margin of error at 99% is 0.037
Answer:
The year 1996
With population of both 21600
Step-by-step explanation:
From 1990 to 2000 = 10 years
So city A grew from 12000 to 28000 that is city A had an increase of 16000 in 10 years.
While city b grew from 18000 to 24000 , that's an increase of 6000 in 10 years to.
For city A
10 years= 16000
1 year = 16000/10
1 year = 1600
For city B
10 years = 6000
1 year = 6000/10
1 year = 600
So we are to find what year the both cities had same population.
12000 + x1600 = y
18000 + x600 = y
X is the year difference
Y is the population at that year
Eliminating y gives
6000= x1000
X= 6
If x is 6
18000+3600= y
21600= y
So 6 years + 1990 = 1996
Answer:
98% confidence interval is (-0.105 , 0.265)
Step-by-step explanation:
n1 = 75 n2 = 75
X1 = 48 X2 = 42
P1 = X1/N1 = 0.64 P2 = X2/N2 = 0.56
98% confidence interval for difference between two proportions is :
P1 - P2 <u>+</u> Z 
= 0.08 <u>+</u> 0.185
= (-0.105 , 0.265)
98% confidence interval is (-0.105 , 0.265)
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