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?

Finally, the arena decides to offer advertising space on the jerseys of the arena’s own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14. what is this as a percentage and a fraction? what is the probability of not being shortlisted? give your answer as a decimal. those shortlisted are entered into a final game of chance. there are six balls in a bag (2 blue balls, 2 green balls and 2 golden balls). to win, a company needs to take out two golden balls. the first ball is not replaced. what is the probability of any company winning advertising space on their volley ball team jerseys?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Worth 15 points handsome jack is buying a pony made of diamonds. the price of the pony is p dollars, and jack also has to pay a 25% diamond pony tax. which of the following expressions could represent how much jack pays in total for the pony? a= p = 1/4 b= p+0.25p c=(p + 1/4)p d=5/4p 0.25p choose 2 answers