1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Scrat [10]
3 years ago
15

17. When a single set of values is randomly divided into two equal groups, explain how the means of these two groups may be very

different from each other and may be very different
from the mean of the single set of values.
Mathematics
1 answer:
joja [24]3 years ago
7 0

If you take 2 groups of equal cardinality, it could happen that, for example, many of the higher values go to the first group and therefore, many of the low values go to the second group, making their respective means quite different and different from the original sample mean. This could even go worse due to the possible existence of outliers, that is, values that are far different than the sample mean. An outlier tend to disrup the mean of a sample, but for smaller samples the result is much dramatic.

For example, let X be {1,2,3,4,5,6,7,8,9,100}

The elements of X sum 145, hence the mean of X is 14,5. Let divide X in two groups

Y = {1,2,3,5,9}

Z = {4,6,7,8,100}

The elements of Y sum 20, so its mean is 4

The elements of Z sum 125, so its mean is 25

Both means are quite different from each other and quite different from the mean of X. Note that if we take the mean of the means the result is 4+25/2 = 14,5 which is equal to the mean of X.

You might be interested in
Help asap please info in pic
SVETLANKA909090 [29]
D will be the answer shifter left 1 point
7 0
3 years ago
Krystal and 4 friends were going to the movies. Each ticket cost $12. They bought 2 buckets of popcorn at $4.50 each and then ea
Crazy boy [7]

so each ticket costs 12 dollars multiply that bye 5 you get 60

each bucket of popcorn costs 4.50 then multiply that bye 2 you get 9

then all five girls get a soda which costs 4.75 so you would multiply 4.75 bye 5 which is 23.75

so in total  you would get B.92.75

8 0
3 years ago
Read 2 more answers
Write an equation of the line below.
kondaur [170]

The equation of the given line above is y=3x-1. The slope of the line is 3/1 (3x) and the y-intercept which is where the line crosses the y-axis is (0,-1) When you plug these parameters into the equation you will get the equation y=3x-1

6 0
3 years ago
PLZ HELP i need the answer now
VARVARA [1.3K]

Answer:

1/5^9

Step-by-step explanation:

You keep the 5 the same

Then you subtract the exponents...

-6 - 3 = -9

Since it’s negative and you can’t have a negative exponent you have to put a 1 as the numerator. So...

1/5^9

5 0
3 years ago
In the system -12c+3d=6 and -3c +6d=-9, which expression could you use for substitution
inessss [21]
You can not use either of them because neither of them have a variable= to the eqaution
ex.) y= 3x+25
3 0
3 years ago
Other questions:
  • 0 is greater than or equal to 7n
    10·2 answers
  • A television network counted 1,771,548 viewers watching the golf tournament on its channel. There were 5,861,014 viewers watchin
    7·1 answer
  • An open box is made from a 30​-cm by 70​-cm piece of tin by cutting a square from each corner and folding up the edges. The area
    7·1 answer
  • The coordinates of a point satisfy the equation of a line if the point is on the line
    13·1 answer
  • If the scale factor is 3 will the image be larger or smaller than the preimage?
    15·1 answer
  • Diane sent 25 invitations to her birthday party. If 1/6 of the invatations were for her family, about how many family members di
    11·1 answer
  • Write an equivalent expression in standard form by
    8·1 answer
  • Please help I will give you brainliest please its due tomorrow and I'm stressing so much
    9·1 answer
  • The length of a rectangular box is 2 times its width, and its height is 6 in more than its width.
    10·1 answer
  • PLS HELP ASAP FIRST CORRECT ANSWER GETS BRAINLEIST​
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!