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
Aliun [14]
3 years ago
7

A school psychologist wants to test the effectiveness of a new method of teaching Art. She recruits 600 second-grade students an

d randomly divides them into two groups. Group 1 is taught by means of the new method, while Group 2 is taught via traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test is administered and the results of the two groups compared. What is the response variable in this experiment?
a. The students’ ability in Art
b. The score of Group 1 on the achievement test
c. The score on the achievement test.
d. The score of Group 2 on the achievement test
Mathematics
1 answer:
yuradex [85]3 years ago
3 0

Answer:

c. The score on the achievement test of both groups.

Step-by-step explanation:

A school psychologist recruits 600 second-grade students and randomly divides them into two groups.

Group 1 is taught by means of the new method, while Group 2 is taught via traditional methods.

We have to find the response variable. A response variable is the outcome variable or dependent variable in the experiment.

Here this is - The scores on the achievement tests of both group 1 and group 2.

You might be interested in
How many grams of an alloy containing 25% silver should be melted with 50 grams of an alloy containing 60% silver in order to ob
Kipish [7]

Answer:

20 grams of an alloy containing 25% silver has to be melted with 50 grams of an alloy containing 60% silver to obtain a final alloy containing 50% silver

Step-by-step explanation:

Hi

We define

A_{a}=50g @ 60\%, wich means alloy a has 50 grams containing 60% silver.

A_{b}=xg @ 25\%, wich means alloy b has x grams containing 25% silver.

So we can build an equiation 50 \times 0.60+x \times 0.25=\frac{1}{2}(50+x), as half of the final alloy has to be silver. Then solving for x

30+0.25x=25+0.5x\\30-25=0.5x-0.25x\\5=0.25x\\x=\frac{5}{0.25}=20

Wich means 20 grams of an alloy containing 25% silver (A_{b}) has to be melted with 50 grams of an alloy containing 60% silver (A_{a}) to obtain a final alloy containing 50% silver.

7 0
3 years ago
There are 5 persons and at a time only 3 can be arranged. What is the total number of arrangements?
disa [49]

Answer:

If there are 5 persons and at a time only 3 can be arranged, the total number of arrangements is 60

Option C is correct

Step-by-step explanation:

There are 5 persons and at a time only 3 can be arranged.

The total number of arrangements = nPr = n!/(n-r)!

Here n = 5 and r = 3

nPr = n!/(n-r)!

nPr = 5!(5-3)!

nPr = 5!/2!

nPr = 5*4*3*2!/2!

nPr = 5*4*3

nPr = 60

So, if there are 5 persons and at a time only 3 can be arranged, the total number of arrangements is 60

Option C is correct.

7 0
3 years ago
If you follow the steps necessary to prove that square root 7 is irrational (use a proof by contradiction) to prove that square
Viefleur [7K]
Sorry, i wish i could help, but really the only thing i know is that 4 is 2 by 2 so using another equation to try to prove otherwise is irrational in itself 
8 0
3 years ago
Suppose that an airline quotes a flight time of 128 minutes between two cities. Furthermore, suppose that historical flight reco
ANTONII [103]

Answer:

(a) The probability density function of <em>X</em> is:

f_{X}(x)=\frac{1}{b-a};\ a

(b) The value of P (129 ≤ X ≤ 146) is 0.3462.

(c) The probability that a randomly selected flight between the two cities will be at least 3 minutes late is 0.4327.

Step-by-step explanation:

The random variable <em>X</em> is defined as the flight time between the two cities.

Since the random variable <em>X</em> denotes time interval, the random variable <em>X</em> is continuous.

(a)

The random variable <em>X</em> is Uniformly distributed with parameters <em>a</em> = 10 minutes and <em>b</em> = 154 minutes.

The probability density function of <em>X</em> is:

f_{X}(x)=\frac{1}{b-a};\ a

(b)

Compute the value of P (129 ≤ X ≤ 146) as follows:

Apply continuity correction:

P (129 ≤ X ≤ 146) = P (129 - 0.50 < X < 146 + 0.50)

                           = P (128.50 < X < 146.50)

                           =\int\limits^{146.50}_{128.50} {\frac{1}{154-102}} \, dx

                           =\frac{1}{52}\times \int\limits^{146.50}_{128.50} {1} \, dx

                           =\frac{1}{52}\times (146.50-128.50)

                           =0.3462

Thus, the value of P (129 ≤ X ≤ 146) is 0.3462.

(c)

It is provided that a randomly selected flight between the two cities will be at least 3 minutes late, i.e. <em>X</em> ≥ 128 + 3 = 131.

Compute the value of P (X ≥ 131) as follows:

Apply continuity correction:

P (X ≥ 131) = P (X > 131 + 0.50)

                 = P (X > 131.50)

                 =\int\limits^{154}_{131.50} {\frac{1}{154-102}} \, dx

                 =\frac{1}{52}\times \int\limits^{154}_{131.50} {1} \, dx

                 =\frac{1}{52}\times (154-131.50)

                 =0.4327

Thus, the probability that a randomly selected flight between the two cities will be at least 3 minutes late is 0.4327.

6 0
3 years ago
A cube has an edge length of 9 meters. What is its volume, in cubic meters?
rjkz [21]
<h3>Answer:  729 cubic meters</h3>

Work Shown:

volume = side*side*side

volume = 9*9*9

volume = 729

A slight shortcut would be to say 9^3 = 729

8 0
2 years ago
Other questions:
  • A survey of 1,200 men and women asked, "Do you earn over $75,000 per year?" The table below shows the responses for males and fe
    12·1 answer
  • You start driving north for 7 miles, turn right, and drive east for another 24 miles. At the end of driving, what is your straig
    9·1 answer
  • While working in the cafeteria at a register, Anna had 150 students come through her line in 4 hours. How much time would it tak
    7·1 answer
  • ​If f(x)=2​x+1, then f(3)=<br> ​​
    7·1 answer
  • Please help me!!!
    7·1 answer
  • Can someone help me whats 100x57?????<br>​
    15·2 answers
  • Choose the missing number. 36 x ____ = 7,200
    7·2 answers
  • 18) slope and y-intercept, I need help ASAP
    12·2 answers
  • Hope you can see this
    11·1 answer
  • Marcus sleeps 60 hours a week this is 5 times as many hours as he plays chess. How many hours a week does Marcus play chess?
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!