Aresearcher performed an experiment with two groups. she found the difference of the means for each group. then she combined the groups, chose two new groups, and found the difference between the means of those new groups. she repeated this process 200 times. the normal distribution of the difference in the means she found is given below. how great would the difference in means between the first two groups have to be in order to considered significant?

a) at least 7
b) at least 8
c) at least 9
d) at least 10

could someone explain it to me?

d

step-by-step explanation:

hello and welcome!

so, when we see the words "proportional" along with a table, we need to know that we're looking numbers that divide by the same thing.

looking at this table, we simply have to do a trial and error, and divide to see which numbers have the same quotient. if you look at choice a & c, they both have equal quotients for three of the numbers, with one exception, so those can't be the answer. looking at b, there is no similarity, so that can't be it. then, we see d; if you divide all the numbers in the table, you'll see that they all divide by two, which is a proportional relationship, and our answer!

also, always remember that the x will always be the number that goes into y, and somewhere behind this table, is a formula. for this specific table, the formula would be:

since our x-value is being divided by two to get the y-value. and if they were to ask for more numbers in the series, this is the formula you would use to find them.

the first option is the answer.

hello, never fear papaguy is here!

c. histogram

step-by-step explanation:

236 cm 16 time 12 = 192

6 times 7 = 42

192+42