Question 3 (Multiple Choice Worth 5 points)(08.01)Ben takes a random sample of 25 students in his seventh-grade class and finds that 85% of the sample prefers math over science. There are 150 students in the seventh grade. Based on the sample proportion, about how many students in the seventh grade would be expected to prefer math over science?
25
85
150
128
Question 4 (Multiple Choice Worth 5 points)
(08.01)Mark wants to know how many families in his neighborhood plan to attend the neighborhood party. He puts all 80 of the neighborhood addresses in a hat and draws a random sample of 20 addresses. He then asks those families if they plan to attend the party. He finds that 20% of the families plan to attend the party. He claims that 20% of the neighborhood families would be expected to attend the party. Is this a valid inference?
No, this is not a valid inference because he asked only 20 families
No, this is not a valid inference because he did not take a random sample of the neighborhood
Yes, this is a valid inference because he took a random sample of the neighborhood
Yes, this is a valid inference because the 20 families speak for the whole neighborhood
Answers
A)The number of students in the seventh grade who would be expected to prefer math to science are: 128
B) The true statement about the inference is (c) Yes, this is a valid inference because he took a random sample of the neighborhood
What is sample?
A sample refers to a smaller, manageable version of a larger group. It is a subset containing the characteristics of a larger population.
A) Given that, the total number of students in seventh grade are: 150 students.
Now he took a sample of 25 students and find that the 85% of the sample prefers math to science.
This means that out of the sample the number of students who prefer math to science is:
= 85 / 100 x 25
= 21.25
Now, out of the total seventh graders the number of students who prefer math to science is:
21.25 x 150 / 25 = 127.5 ≈ 128
B) From the question, we understand that:
Mark draws a random sample of 20 addresses from all 80 of the neighborhood addresses.
The above selection is a random sampling technique
Therefore, the true statement about the inference is (c) Yes, this is a valid inference because he took a random sample of the neighborhood
Learn more about samples, click;
#SPJ3
Option 1 : 25
Option 2 : 85
Option 3 :150
Option 4 :128
Solutions - Convert the percent into decimal and multiply.
85% of 150 = 0.85 * 150
= 127.5 which is rounded to 128
Part 2 : Mark wants to know how many families in his neighborhood plan to attend the neighborhood party. He puts all 80 of the neighborhood addresses in a hat and draws a random sample of 20 addresses. He then asks those families if they plan to attend the party. He finds that 20% of the families plan to attend the party. He claims that 20% of the neighborhood families would be expected to attend the party. Is this a valid inference?
No, this is not a valid inference because he asked only 20 families
No, this is not a valid inference because he did not take a random sample of the neighborhood
Yes, this is a valid inference because he took a random sample of the neighborhood
Yes, this is a valid inference because the 20 families speak for the whole neighborhood
Solutions : Plans to attend doesn't mean they would come. It is a 50/50 chance. 2/8 * 100% is 25%.
Answer = (C) = Yes, this is a valid inference because he took a random sample of the neighborhood
Related Questions
All of the following represents the same ratio except 4:3 4/3 or 3 to 4
A taxicab starts at (1, -2) on the grid. It goes 3 blocks west and 4 blocks north to pick up a passenger. Then it goes 8 blocks east and 1 block south and drops off the passenger. Which rule will bring the taxicab back to its starting position?
(I screenshot my question and choices. can you please help D: )
Sin x= 0.46 what is the value of x
Answers
Answer:
The answer is 1
Step-by-step explanation:
Remember PEMDAS, 1+2 is 3. 2x3 is 6, then 6 divided by 6 is 1.
Answer:
1
Step-by-step explanation:
6 / 2(1 + 2)
6 / 2(3)
6 / 6 = 1
B. 70.7 centimeters
C. 6,361.7 centimeters
D. 141.4 centimeters
Answers
d = diameter.
C = π*45
C = 45π
C ≈ 45*3.142
C≈ 141.39
C ≈ 141.4
Option D.
How much $ does she spend in all?
Answers
By adding all the money she spend we get $0.69
What is the unitary method?
The unitarymethod is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.
Multiplication is the mathematical operation that is used to determine the product of two or more numbers. If an event can occur in m different ways and if following it, a second event can occur in n different ways, then the two events in succession can occur in m × n different ways.
We are given that Dee spends $0.25, $0.30, $0.10 and $0.04.
We need to find the money she spend in all.
Therefore, we have to add all the expenditure
0.25 + 0.30 + 0.10 + 0.04 = 0.69
The total money she spend could be 0.69.
Learn more about the unitary method, please visit the link given below;
#SPJ2
explanation: 0.25 + 0.30 + 0.10 + 0.04 = 0.69
Answers
Answer: 360,360
Step-by-step explanation:
The number of permutations of n things of which a are identical, b are identical and so on... :-
Given : A clothing store has a certain shirt in 4 sizes: small, medium, large, and extra large.
If it has 2 small, 3 medium, 6 large, and 2 extra large in stock, then total shirts :
Then, the number of orders in which the store can sell all the t-shirts will be :_
Hence, the number of orders in which the store can sell all the t-shirts = 360,360
9x6 = (__)?
16y6 = ()2
Then use a? - b2 = (a - b)(a + b). Show your work.
9x6 – 16y6 =
Answers
Answer:
(3x^3 - 4y^3) ( 3x^3 + 4y^3)
Step-by-step explanation:
9x^6 – 16 y^6
Rewriting as
(3x^3) ^2 - ( 4y^3) ^2
This is the difference of squares a^2 - b^2 = (a-b)(a+b)
(3x^3 - 4y^3) ( 3x^3 + 4y^3)
Answer:
(3x^3 - 4y^3) ( 3x^3 + 4y^3)
() = −162 + 80 where t is time in seconds and f(t) is height in feet. Find how long it will take the
arrow to hit the ground using an algebraic method. Show all of your reasoning/steps used with this algebraic
method.
what is being asked in the problem?
show work when you solve
explain your answer
Answers
Answer:
Since 162 is negative you subtract 162-80 which is 82
Step-by-step explanation:
So it will take 82 seconds for the arrow to hit the ground I believe I’m checking my answer real quick. Ya it’s right can I maybe brainliest?