Answer: B. 264
Step-by-step explanation:
Formula to calculate the sample size 'n' , if the prior estimate of the population proportion (p) is available:
, where z = Critical z-value corresponds to the given confidence interval
E= margin of error
Let p be the population proportion of clear days.
As per given , we have
Prior sample size : n= 150
Number of clear days in that sample = 117
Prior estimate of the population proportion of clear days =
E= 0.05
The critical z-value corresponding to 95% confidence interval = z*= 1.95 (By z-table)
Then, the required sample size will be :
Simplify ,
Hence, the sample size necessary to construct this interval =264
Thus the correct option is B. 264
1)the greater absolute value is 1-701
2)by the number of the surface that has the less number
Answer:
-63 / 7
Step-by-step explanation:
Answer:
The two solutions are x = -7 and x = 1
Step-by-step explanation:
We complete the square for the expression on the left of the equal sign, by adding the "square of half of the coefficient of the term in x". That is, in our case we need to add
So we proceed to add 9 on both sides of the equation, that way completing a perfect square trinomial on the left side of the equal sign:
Notice now that the perfect square on the left is , so we replace it in our equation:
Therefore, we get two possible solutions:
a) , and
b)
So our two solutions are x= -7 and x=1
Answer:
???
Step-by-step explanation:
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