Answer:
B. z Subscript alpha divided by 2 zα/2 = 1.96.
Step-by-step explanation:
We are given that we want to construct a confidence interval. For this, the summary statistics for randomly selected weights of newborn girls:
n = 236, 
= 30.3 hg, s = 7.2 hg. The confidence level is 95%.
As we can clearly see here that the population standard deviation is unknown and the sample size is also very large.
It has been stated that when the population standard deviation is unknown, we should use t-distribution but since the sample size is very large so we can use z distribution also as it is stated that at very large samples; the t-distribution corresponds to the z-distribution.
Here, 
= level of significance = 1 - 0.95 = 0.05 or 5%
= 0.025 or 2.5%
So, the value of 
in the z table is given as 1.96 with a 2.5% level of significance.
9514 1404 393
Answer:
Step-by-step explanation:
Let 'a' and 'e' represent Alvin's and Elga's ages, respectively.
a = e-12 . . . . . Alvin is 12 years younger
a + e = 86 . . . the sum of their ages is 86
__
Substituting for 'a' gives ...
(e -12) +e = 86
2e = 98
e = 49
a = 49 -12 = 37
Alvin is 37; Elga is 49.
what is the full question
(-5,2) is located in the II quadrant because the x is negative and the y is positive.
(5,-5) is located in the IV quadrant because the x is positive and the y is negative.
(2,-5) is also located in the IV quadrant because the x is positive and the y is negative.
(-4,-5) is located in the III quadrant because both x and y are negative.
Here, You have an equation: y = 10x - 20
If you put x = 2, then y = 10(2) - 20 = 20 - 20 = 0
So, Your first point on the graph would be: (2, 0)
Then, for every x value, y will increase for 10 (which is the cost of a ceramic bowl)
So, next coordinates of your graph would be: (3, 10) (4, 20) (5, 30) ( 6, 40) and so on...
Just mark that points, and draw a line on them. Your Graph work will be done.
Hope this helps!
