Does ginkgo improve memory? The law allows marketers of herbs and other natural substances to make health claims that are not supported by evidence. Brands of ginkgo extract claim to "improve memory and concentration." A randomized comparative experiment found no statistically significant evidence for such effects. The subjects were 350 healthy volunteers over 60 years old. They were randomly assigned to ginkgo or a placebo pill (a dummy pill that looks and tastes the same). All the subjects took a battery of tests for learning and memory before treatment started and again after six weeks. A. If the results were statistically significant, can the results of this study be generalized to a larger population? Can cause-and- effect be inferred? Explain. B. Explain why it is advantageous to use 350 volunteers in this study, rather than, say, 30 volunteers. C. Name a confounding variable that was controlled in this experiment and explain why it was beneficial to control that variable.

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: List the restrictions

A: Given expression ( f(x) ) is    fx=x+2x-32x-1x+2×2x-1x+5x-4x-3   This can be simplified by…

Q: -q - -p is equivalent to A qV-p В -qV p ЧА-Р D ЧАР

A: The given statement -q→-p. We have to find the equivalent statement.

Q: 6z-82

A: According to question we have to solve given expression 6z-8<4 for z6z - 8 < 4 add both side…

Q: x¹y-x³y² + x²y_8x¹y-x²y-10+x 10+ x³y²7x³y²-9+218x¹y-y³ +50=

A: The expression is given by x4y-x3y2+x2y-8x4y-x2y-10+x3y2-7x3y2-9+218x4y-y3+50 To evaluate: The…

Q: X+X+y if x = 9 and y = 3

A: Given data is x = 9 and y = 3   find x + x + y = ?

Q: 1.25a +3> 0.5a-6 and 2.5a 129-1.5a

A:

Q: Queslion lo

A:

Q: Find the Funetion

A:

Q: 1+1+1+1+1 1+1+1+1+1 1 + 1 x 0 + 1 = ?

A: Given expression: 1+1+1+1+1+1+1+1+1+1+1+1×0+1=?

Q: 6 -81 3 II

A: We have to find the value

Q: Find Зе 3e3ay

A: Partial derivative with respect to x means treat y constant.

Q: The formula P^Q →QvP stands for

A: P∧Q→Q∨P∧ means AND∨ means OR→ means if-then   We can see the meaning of different symbols from there…

Q: Let = 2 4-8 L and = 0 Then proj= CO -4 3

A:

Q: x² 6. x*-4x3 x

A:

Q: how did you get infinity

A: we need to know that limx→∞(x)=∞ and limx→∞x2=∞and∞=∞

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.