Some researchers claim that herbal supplements such as ginseng or ginkgo biloba enhance human
memory. to test this claim, a researcher selects a sample of n = 25 college students. each student
is given a ginkgo biloba supplement daily for six weeks and then all the participants are given a
standardized memory test. for the population, scores on the test are normally distributed with ? =
70 and ? = 15. the sample of n = 25 students had a mean score of m = 75.
a. are the data sufficient to that the herb has a significant effect on memory? use a twotailed
test with ? = .05.
b. compute cohen

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

x = 12

y = 15

step-by-step explanation: