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WITCHER [35]
3 years ago
9

How big is the home field advantage in the National Football League (NFL)? To investigate, we select a sample of 80 games from t

he 2011 regular season1 and find the home team scored an average of 25.16 points with a standard deviation 10.14 points. In a separate sample of 80 different games, the away team scored an average of 21.75 points with a standard deviation of 10.33 points. Use this summary information to find a 90%c onfidence interval for the mean home field advantage, µH- µA, in points scored.
The 90% confidence interval is______ to________ .
Mathematics
1 answer:
ElenaW [278]3 years ago
5 0

Answer:

0.74 to 6.06

Step-by-step explanation:

The groups are independnet,

SE(xh bar-xa bar)=sqrt [sh^2/nh+sa^2/na]=sqrt [10.1^2/80+10.3^2/80]=1.61

At df=157, the t critical is 1.65

90%c.i=(xh bar-xa bar)+-tcritical SE(xh bar-xa bar)

=(25.2-21.8)+-1.65*1.61

=0.74 to 6.06

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On a map, 1 inch equals 7.4 miles. Two houses are 1.5 inches apart on the map.
bagirrra123 [75]

Answer:

11.1 miles.

Step-by-step explanation:

1 inch is 7.4 miles.

1.5 inch is 7.4 times 1.5 miles.

11.1 miles.

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How to solve a quadratic equation when c=0
kherson [118]
Lets say we have a quadratic equation:

3x^2 + x + 0 = 0

Now, since if we add or subtract 0 from something, the original value stays the same, which means we can write the equation as 3x^2 + x = 0 and ignore the “+0”.

In these kinds of equations, you /can/ use the quadratic formula, but theres a much quicker way. If we factor 3x^2 + x, we get x(3x + 1) = 0. Here, x has two possible values — since the result of the multiplication is 0, that means that either one expression or the other must equal 0. In essence:

If x(3x+1) = 0 then x = 0 or 3x+1 = 0
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3x+1=0
3x= -1
x = -1/3

So x1 = 0 and x2 = -1/3. So basically you solve these equations using basic factorization. :)
6 0
3 years ago
You are building a frame for a window. The window will be installed in the opening shown in the diagram. Determine whether the o
creativ13 [48]

This looks like an incomplete answer to me...

I cannot see any diagram or window or opening, or any lines that indicate they are line AC or BD.

4 0
4 years ago
Mortgage needs $480 to buy a TV and stereo system for his room. He received $60 in each for birthday presents. He plans to save
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14 weeks is the answer

60+ 30w = 480
-60 -60
30w = 420
Divide by 30 on each side
w = 14
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4 years ago
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