If 3 out of 10 mammalian cell cultures exposed to ultraviolet (UV) radiation developed chromosomal abnormalities while 9 out of 10 mammalian cell cultures developed chromosomal abnormalities when exposed to UV radiation plus a common NSAID (nonsteroidal anti-inflammatory drug). a. What is the type of study design?
b. Which parameter (s) can be determined? Calculate it.
c. Explain the results.

a) Observational Study

b) Risk in observational study

RR = 9/10/3/10 = 3.0

c) Relative risk when exposed to  a common NSAID is 3 out of 10 people

Step-by-step explanation:

A) This is observational study

b) The parameter determined here is the risk in observational study

RR = 9/10/3/10 = 3.0

c) Relative risk of mammalian cell to develop chromosomal abnormalities when exposed to  a common NSAID is 3 out of 10 people

3. parallelogram

step-by-step explanation:

we turn each of our sides into direction vectors

ab=b-a=(3 - 7, 1 - 0) = (-4, 1)

bc=c-b=(1,6)

cd=d-c=(4,-1)

da=a-d=(-1,-6)

we see how the opposite sides have negated direction vectors; this is characteristic of a parallelogram.   we have congruent sides ab=cd and bc=da with unequal lengths because 1^2+6^2 is different from (-4)^2+1^2.   so it's not a square or a rhombus.  

we check the dot product of direction vectors of adjacent sides.   we have

ab dot bc = -4(1) + 1(6) = 2

that's not zero so the sides are not perpendicular.   we've ruled out rectangle.

the direction vectors indicate two pairs of congruent parallel sides, so we choose parallelogram over trapezoid.

answer: i think it's a

step-by-step explanation: