In each case below, we describe a study to determine whether exercise helps increase certain mood enhancing chemicals in the brain. Indicate whether each describes an experiment or an observational study. (1) We contact a random sample of 100 people and record how much each person exercises and also measure the chemicals in the brain for each person. (2) Using a random sample of 100 people, we randomly assign half of them to participate in a regular exercise program for a six-week period while the other half makes no changes. At the end of the time period, we measure the brain chemicals.

Q: Evaluate if x=4,8,3,-2 ∑x ∑x+1 ∑(x+1) 3∑x - 4

A: Given that  if x=4,8,3,-2

Q: avb (avb)+ F

A:

Q: Evaluate x²+3x+5

A:

Q: 1. O O O O lim (In(x))* ? 5.

A: Consider the given expression. y=limx→0+lnxxx Take ln on both sides of the equation.…

Q: B through f

A: (b) A(7)=∫07f(t)dt=Area under the curve from x =0 to x =7=Area of triangle (from x =0 to x=1)-area…

Q: Example 2

A: We know that the median is given by; Median=n+12th observation, if n is oddn2th observation+n2+1th…

Q: xp xペ-4xt13

A:

Q: Graphs of Rational Functions Determine the rational equation for each graph shown, beginning with y…

A: Given Starting function is y=1x     Translation theory- 1. If graph is shifted towards right by p…

Q: More examples on algebra

A: Given data is : Provide more example on algebra.

Q: We expect a car's highway gas mileage to be related to its city gas mileage. Data for all 1198…

A:

Q: Which graph represents the following ellipse (z+1)ª + 16 (v-3)° 36 = 1?

A:

Q: w + (-7), when w = - 1

A: The expression is given by w+(-7) To evaluate: The value of the expression when w=-1.

Q: [-1 ] 5 8 1,

A:

Q: 3(c) please

A:

Q: Example 6

A: The scores of the second attempt is given as- Second attempt 34 31 37 32 40 32 44 37 47 41…