What is your question? that made no sense sweet heart.
Answer:
c)
Step-by-step explanation:
The definition of an observational study is: one where researchers observe the effect of a risk factor or an intervention but they do not try to change who is exposed to the factor.
In this particular example, the researchers administered a questionnaire to 391 twelve-year-old and concluded that the body mass index of the adolescents who had a supply of sugary snacks in their bedroom was significantly higher than that of the adolescents who did not have a supply of sugary snacks in their bedroom.
This is not an observational study because the researchers actually administered a questionnaire and analyzed the results. To be an observational study the individuals would have been observed without any intervention (the questionnaire could have had an effect on the adolescents changing their habits)
Answer:
y = 3x - 5
Step-by-step explanation:
So first take any two points from the graph.
(0, -5), (2, 1)
The slope is 
y = mx + b
b is the y intercept
The y intercept is (0, -5) as this is where the line intersects the y axis.
y = 3x - 5
Answer: 34.965%
Step-by-step explanation:
No. of ways of selecting 8 songs from 14 songs = = 14! / [ 8! × (14-8)! ]
= 14! / (8! × 6!)
= 3003
If you listended to exactly four country songs, then you should listen to four pop songs because you listened to 8 songs
Number of ways of selecting 4 country songs from total 8 country songs
= 8! / [ 4! × (8-4)! ]
= 8! / (4! × 4!)
= 70
Number of ways of selecting 4 pop songs from total 6 pop songs
= 6! / [ 4! × (6-4)! ]
= 6! / (4! × 2!)
= 15
Number of ways of playing 4 country songs and 4 pop songs in total 8 songs = 70 × 15
= 1050
So Probability that you listened to exactly four country songs =1050/3003
= 0.34965
= 34.965%
Answer:
about 60.26 degrees
Step-by-step explanation:
The ratio of the tangent function for a, is 7/4
tan(a)=7/4
tan^-1(tan(a)=tan^-1(7/4)
a is about 60.26 degrees.
