Jacob wants to know how many students in his school enjoy watching space travel programs on tv. he poses this question to all 20 students in his history class and finds that 80% of his classmates enjoy watching space travel programs on tv. he claims that 80% of the school's student population would be expected to enjoy watching space travel programs on tv. is jacob making a valid inference about this population?

no, it is not a valid inference because his classmates do not make up a random sample of the students in the school
no, it is not a valid inference because he asked all 20 students in his history class instead of taking a sample from his math class
yes, it is a valid inference because his classmates make up a random sample of the students in the school
yes, it is a valid inference because he asked all 20 students in his history class

No, it is not a valid inference because his classmates do not make up a random sample of the students in the school

Step-by-step explanation:

If Jacob wants to do a valid inference about this population, he has to pose this question to at least 1 student from every classroom that his school has.

9) i can't see the angle so whatever it is just do this: cos(angle) x hypotenuse and then use that answer and they hypotenuse and plug it into this: (answer you just got)^2 + b^2 = (hypotenuse)^2. the first answer will be the answer of the adjacent side and the second answer after this equation will be the opposite side.

10) y = 14 x = √147 or 12.12435565

11) x = 4.8

12) x = 4.2

13) x = 9.3

14) pq: 13.2

qr : 17.6

angle p: 53º

15) angle c: 54.3º

angle a: 35.7º

16) h = 21040

v = 1841

step-by-step explanation:

10) 7/sin(30) = 14 = y

7^2 + b^2 = 14^2

49 + b^2 = 196

b^2 = 196 - 49

√b^2 = √147

x = √147

11) cos(70) x 14 = 4.788282007

x = 4.8

12) tan(25) x 9 = 4.196768923

x = 4.2

13) sin(31) x 18 = 9.270685348

x = 9.3

14) pq: sin(37) x 22 = 13.23993051

pq: 13.2

qr: cos(37) x 22 = 17.56998122

qr : 17.6

angle p: 180 - (37 + 90) = 53º

15) cos-1(7/12) = 54.31466529

angle c: 54.3º

angle a: 180 - (90 + 54.31466529) = 35.68533471

angle a: 35.7º

16) 4 x 5280 = 21120

cos(5) x 21120

h = 21039.63202

h = 21040

sin(5) x 21120

v = 1840.729287

v = 1841