Answer:
5/12
Step-by-step explanation:
12/6 can be written as 42/12 by multiplying 2 on both sides
47/12-42/12 =5/12
Answer:
2 science fiction and 5 mystery
Step-by-step explanation:
First, we will set up a system of equations.
x (science fiction) y (mystery)
x + y = 7 This is the total books bought.
7x + 9y = 59 The amount of each set to the total cost.
Now we solve.
(-7)x + y = 7 equals
-7x - 7y = -49
added to
7x + 9y = 59
this equals
2y = 10
y = 5
Now we know one. We can plug it in to find the other value.
x + 5 = 7
x = 2
<span> f(x) = –81 (4/3) X-1 f(x) = –81 (-3/4) </span>
Answer:
So on this case the only option that satisfy the calculated statistic is:
z=-0.42
Step-by-step explanation:
Assuming this complete problem: "In a 2-sample z-test for two proportions, you find the following:
^P1 = 0.32, (n,1)=50
^P,2= 0.36, (n,2)=50
Find the test statistic you will use while executing this test:
z=-0.67
, z=±1.64
, z=-1.96
, z=0.34
, z=-0.42"
Solution to the problem
Data given and notation
sample 1 selected
sample 2 selected
represent the sample proportion for 1
represent the sample proportion for 2
z would represent the statistic (variable of interest)
represent the value for the test (variable of interest)
We need to apply a z test to compare proportions, and the statistic is given by:
(1)
Or equivalently:
(1)
Where
Calculate the statistic
Replacing in formula (1) the values obtained we got this:
So on this case the only option that satisfy the calculated statistic is:
z=-0.42