A scientist who studies sleep has developed a new technique to help people sleep each night. He is conducting a study of 100 people and wants to determine if there is a significant difference in
Deople's amount of sleep before using the technique compared to after using the technique.
Which of the following describes the scientist's null and alternative hypotheses?
O null hypothesis: 4p = 0; alternative hypothesis: Lp 70
O null hypothesis: 4y = 0; alternative hypothesis: 4p = 0
O null hypothesis: 4-12 = 0; alternative hypothesis: 4-170
null hypothesis: 44-470; alternative hypothesis: 44-42 = 0

answer: #1 ads up by 8 and i don't know #2

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

radha is now 5 years old

3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !

answer: the answer is 100 x 12,500, which is 1,250,000.

step-by-step explanation: emily solved for a part when she should have solved for the whole.  

875,000 should be the numerator of the equivalent ratio.  

70 x 12,500 is 875,000.