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denis-greek [22]
3 years ago
6

Last year, the average math SAT score for students at one school was 475. The headmaster introduced new teaching methods hoping

to improve scores. This year, the mean math SAT score for a sample of students was 481. If the teaching method had no effect, there would be roughly a 3 in 10 chance of seeing such an increase. Does the result have practical significance? Why or why not?
Mathematics
2 answers:
Daniel [21]3 years ago
5 0

Answer and step-by-step explanation:

Yes, it does have practical significance.

If the method was ineffective, the chance of an increase this large was 3/10, or 30%.  This means with an ineffective teaching method, there was a 100-30 = 70% chance of not seeing a score increase this large.

Since we did see a result this large, and 30% is not a very large chance, we can say that the method was most likely effective.

Debora [2.8K]3 years ago
4 0
I would argue that it does due to that if it increased, it's either from a 30% chance that nothing changed or that the teachers did it. Since 100-30=70, there's a 70 percent chance that the teaching effect did work!
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Identify the constant of proportionality in the table below use the formula y = KX.
mote1985 [20]
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For the first one,14/2 which equals 7.Try the next set,21/3=7 also and finally 35/5=7.You can see that the C.O.P is 7.

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2 years ago
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nlexa [21]

Answer:

Step-by-step explanation:

Devin is making a candle by pouring melted wax into a mold in the shape of a square pyramid.

Each side of the base of the pyramid is 9 cm and the height of the pyramid is 10 cm (as shown in figure below)

also, To get the wax for the candle, Devin melts cubes of wax that are each 4 cm by 4 cm by 4 cm

We have to find the number of wax cubes will Devin need in order to make the candle.

Consider Wax cubes of dimension 4 cm by 4 cm by 4 cm

Volume of cube =  (side)³

Thus, Volume of one wax cube is given by = (side)³

Volume of one wax cube  = (4)³= 64 cm³

Now we find the volume of square pyramid.

Volume of square pyramid =

Thus,Volume of given square base with base side 9 cm and height 10 cm is

Area of square = (side)²

Volume of square pyramid =

Volume of square pyramid =

Volume of square pyramid =

thus, the volume of square pyramid is 270 cm³

(approx)

Thus, the number of wax cubes required is 4.21. Rounding it off to the nearest whole number, we will get 5.

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7 0
3 years ago
The area of Tracy's backyard is 1 1/3 acres she plants a garden that take up 1/3 of the backyard what area in acres of the garde
attashe74 [19]

Answer:

\frac{4}{9}\ acres

Step-by-step explanation:

step 1

we know that

The area of Tracy's backyard is 1\frac{1}{3}\ acres

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step 2

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5 0
2 years ago
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Dmitry_Shevchenko [17]

Answer:

Part A:

1.40x+8.00=C

Part B:

1.40x+8=26

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Step-by-step explanation:

An expression to represent this would be 1.40x+8.00=C (C is total cost).

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