00:00 Blanka Brikho: Attempt 1
A study is being conducted on whether natural lighting improves test scores. The
new room has natural sunlight, while the old has no windows and fluorescent lights.
Use a .05 level of significance to test the claim that scores are higher in the new
testing area.
3
student
6
new
old
1
90
87
9
2
85
80
3
93
93
12
4.
74
76
5
81
80
15
6
76
65
7
90
79
8
95
95
9
100
98
10
76
70
11
67
69
12
88
92
13
79
70
14 80 66 15 93 90

tip $2.90

total $17.40

the bolded word " farsighted" could be replaced with visionary.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

given expression is

we have radical  

we need to select an option that has same radical

(a)  

this expression has cube root instead of square root . so it is not a like radical.

(b)

y is included inside the radical. so it is not a like radical.

(c)

this expression has cube root instead of square root . so it is not a like radical.

(d)

5 is inside the radical square root. so it is   a like radical.