I will give brainiest to whoever answers correctly !!

Answer:

The calculated value of t= -0.9468 does not lie in the critical region t= -1.701. Therefore we accept our null hypothesis that mean science test score is lower for students taught in traditional lab sessions than it is for students taught using interactive simulation software at the 0.05 significance level

Step-by-step explanation:

Categories         Sample Size           Mean           Standard D

Traditional Lab        17                        71.5                    4.8

Software                 13                        78. 5                    6

We are using Student's t- test considering that the population variance is equal.

We formulate null and alternate hypotheses are

H0 : u1 < u2 against Ha: u1 ≥ u 2

The Significance level alpha is chosen to be ∝ = 0.05

The critical region t ≤ -t (0.05, 28) = -1.701

Degrees of freedom is calculated df = υ= n1+n2- 2= 17+13-2= 28

Here the difference between the sample means is x`1- x`2= 71.5-78.5= -7

The pooled estimate for the common variance σ² is

Sp² = 1/n1+n2 -2 [ ∑ (x1i - x1`)² + ∑ (x2j - x`2)²]

= 1/17+13-2 [ 71.5²+78.5²]

Sp = 20.0664

The test statistic is

t = (x`1- x` ) /. Sp √1/n1 + 1/n2

t= -7/ 20.0664 √1/17+ 1/13

t= -7/7.393

t= -0.9468

The calculated value of t= -0.9468 does not lie in the critical region t= -1.701. Therefore we accept our null hypothesis that mean science test score is lower for students taught in traditional lab sessions than it is for students taught using interactive simulation software at the 0.05 significance level

Answer:

the answer is (2•5x5y3)

Step-by-step explanation:

1.  (2x4 • y3) • 5x

Multiplying exponential expressions

2. x4 multiplied by x1 = x(4 + 1) = x5

Final result :

(2•5x5y3)

Sorry if I'm wrong

Answer:

10 x ^5 y^ 3

Step-by-step explanation:

Answer:

Blue part = [tex]\dfrac{6}{17}[/tex]

Step-by-step explanation:

Given that,

Total number of jelly beans = 17

Red beans = 2

Blue beans = 6

White beans = 4

Green beans = 5

We need to find what part of the jelly beans is blue.

[tex]F_b=\dfrac{\text{Blue beans}}{\text{Total beans}}\\\\F_b=\dfrac{6}{17}[/tex]

Hence, the required part of the jelly beans that is blue is [tex]\dfrac{6}{17}[/tex].

Answer:

what is Joshuas savings?

Answer:

10 months

Step-by-step explanation:

250 / 25

hope this helped :))

Answer:

-937.5 mph

Step-by-step explanation:

Assuming this takes place in a right angled triangle. With the hypotenuse side being, d, 15 miles, the opposite side being 9 miles and the adjacent being an unknown, x.

Using Pythagoras theorem, we know that

x² = 15² - 9²

x² = 225 - 81

x² = 144

x = √144

x = 12 miles.

Again, we should know that

2xx' = 2dd', this means that

xx' = dd'

From the question, we're told that it's decreasing at d' = 750 mph. On substituting, we have

x' = dd' / x

x' = (15 * -750) / 12

x' = -11250 / 12

x' = -937.5 mile per hour

The ground speed of the plane is also decreasing at 937.5 mile per hour

Answer:

593 million=593,000,000=5.93×10⁸

5.93×10⁸ is the right answer.

Answer:

see the attachment

Step-by-step explanation:

The break-even point is on both curves. The y-intercept can be used for the other point in each case.

The break-even point is where cost and revenue are the same:

 20/3x +50 = 10x

 50 = 10/3x . . . . . . . . subtract 20/3x

 15 = x . . . . . multiply by 3/10

 r = c = 10(15) = 150 . . . . for x = 10

Two points you can use for graphing the lines are ...

 cost: (0, 50) and (15, 150)

 revenue: (0, 0) and (15, 150)

9514 1404 393

Answer:

  6

Step-by-step explanation:

Cost and revenue are equal when ...

  C = R

  2.5x +21 = 6x

  21 = 3.5x . . . . . . subtract 2.5x

  6 = x . . . . . . . . . .divide by 3.5

The company must sell 6 items to break even.

Answer:

True

Step-by-step explanation:

Two shapes are congruent if when turning, flipping or sliding one shape it can become another.

Answer:

i dont understand can you put it in like an equation

Answer:

17.5

Step-by-step explanation:

formula:

y=k(x)

direct variation^^^

y=7, x=2

substitute it in the formula

7=(k)2 or 7=2k

7/2 or 3.5= k, k is the constant

now substitute k to the problem

y=5k

y=5(3.5)

y=17.5

Answer: A. c = 1.35n + 15

Step-by-step explanation:

Given: Charge for each job = $15

Additional cost per poster = $ 1.35

Total cost = Charge for each job + (Additional cost per poster) (Number of posters)     ...(i)

Varaibles:

c= Tota; cost for n posters.

Substitute all values in (i), we get

[tex]c=15+1.35n[/tex]

Hence, the required equation : c = 1.35n + 15

Hence, the correct option is A. c = 1.35n + 15.

Answer:

$3.25

Step-by-step explanation:

The grapes costs $2.70 per pound but you're buying 2.5 pounds so take $2.70 x 2.5 = $6.75. Now u just take $10 - $6.75 which equals $3.25 and thats ur answer.

Answer:

You receive 3.25 cash back.

Step-by-step explanation:

2.70 x 2.5 = 6.75

6.75 + ? = 10

A = 3.25

Answer:

6.7

Step-by-step explanation:

Theres a formula to figure this out. If you know two sides of a right angle triangle you can find the third.

Use the formula a²=b²+c², where a is the side opposite the right angle and b and c are the other sides.

a²=b²+c²

7²=2²+c²

49=4+c²

49-4=c²

c=√45 or 6.7082039325

Answer:

7:30 pm

Step-by-step explanation:

pretty much just add on all the times

i think it's just simply y - 7 ?

Answer:

Its y-7

Step-by-step explanation:

7 less than Y/ y - 7

Answer:

45 yellow ones, i think

Step-by-step explanation:

for every 2 green, there are 5 yellow

there are 18 green, so 9 pairs

9 times 5 = 45  (i multiplied by 5 because there are 5 yellow for each pair of green)

Answer:

y * 184 = 395

Step-by-step explanation:

Answer:

184y = 395 should be the answer

Step-by-step explanation:

Answer:

[tex]c=\sqrt{32}[/tex]

Step-by-step explanation:

When we solve for this we should always remember this formula [tex]a^2+b^2=c^2[/tex] and since we already know a and b we can plug that in to find out what c could be but we won't actually solve it.

[tex]a^2+b^2=c^2\\4^2+4^2=c^2\\16+16=c^2\\32=c^2\\\sqrt{c^2}=\sqrt{32}\\c=\sqrt{32}[/tex]

So c would equal whatever the square root of 32 is.

Answer:

113

Step-by-step explanation:

The area is π[tex]r^{2}[/tex], and pi is about 3. r is d/2 which is 12/2=6.

6^2 is 36 and 36*3 = 108. 113 is the closest, so that is the best estimate.

Answer:

The answer is 10,000

Step-by-step explanation:

So the answer is not there so it is none of the above

Answer:

[tex]3 \times 3 - 9 + 2 = 9 - 9 + 2 = 2[/tex]

Answer: 2

Step-by-step explanation: 9-9=0+2=2

Answer:

there is no answer

but ok

Step-by-step explanation:

Answer:

depending on how you're rounding it

Step-by-step explanation:

90,000  88,000 87,000 87,400 87,390 if its more then five round up less than five round down

Answer:

-2 < 6

4 > -8

Step-by-step explanation:

25% = 1/4

Count total squares in each and the number of blue ones.

Divide blue by total and see which one is 1/4.

The 3rd image shows 1/4

Answer:

It is A trust me i got C wrong!

Step-by-step explanation:

Hope this help! (:

Answer:

the first one

4(2x+1)

Step-by-step explanation:

3x+5x=8x

6-2=4

8x+4