Answer:
Two-sample t test.
Because we have two different sections and we want to see if exists difference between the two averages. Both sections are independent so it can be considered as different samples.
Step-by-step explanation:
Two-sample t test.
Because we have two different sections and we want to see if exists difference between the two averages. Both sections are independent so it can be considered as different samples.
If we don't know the population deviations, so for this case is better apply a two sample t test to compare means, and the statistic is given by:
(1)
t-test: "Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other".
Take the square root of 10,000, which is 100.
Answer:
The third one
Step-by-step explanation:
The process would be figuring out the square root of the first and last term of each equation, after doing so, you would take that number (square root of first and last number) then you do 2(a)(b) which would be which should be the middle term. In this case 2(5)(4) = 40 which is correct.
Answer:
160 off 20p coins
Step-by-step explanation:
- 1 p, 20 p, 5 p coins
- 1 p= 3/8 of the bag
- 5 p= 1 p= 3/8 of the bag
20 p coins= 640 - 640*(3/8+3/8)= 640*(1- 6/8)= 640 * 2/8= 640* 1/4= 160