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worty [1.4K]
4 years ago
14

The mean gpr averages of a random sample of 36 college seniors is calculated to be 2.6. the population standard deviation is 0.3

.
a. find the 95% confidence interval for the mean of the entire senior class.
b. find the 99% confidence interval for the mean of the entire senior class.
c. which confidence interval is wider? why?
Mathematics
1 answer:
Alika [10]4 years ago
8 0
A is the correct answer
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The trapezoid and kite have been broken for you.
faltersainse [42]

Answer:

  • 20 m²
  • 21 m²
  • less than

Step-by-step explanation:

<u>Trapezoid</u>

The trapezoid has been broken into two triangles and a rectangle. The two triangles both have the same dimensions, so both have the area ...

  A = (1/2)bh = (1/2)(2 m)(5 m) = 5 m²

The rectangle has area ...

  A = bh = (2 m)(5 m) = 10 m²

So, the total area of the trapezoid is ...

  trapezoid area = 5 m² +10 m² +5 m²

  trapezoid area = 20 m²

__

<u>Kite</u>

The kite has been broken into two triangles, so the area of each of them is ...

  A = (1/2)bh

  A = (1/2)(7 m)(3 m) = (21/2) m²

Then the area of the two halves of the kite will be ...

  kite area = 2 × (21/2 m²)

  kite area = 21 m²

__

The area of the trapezoid is <u>1 m² less than</u> the area of the kite.

6 0
3 years ago
The graph of a linear equation has a slope of -2 and passes through point (-4, 3 ) what is the equation of the line
Irina-Kira [14]

Answer:

(-4,3)=x1,y1

m=-2

we have

y-y1=m(x-x1)

y-3=-2(x+4)

y-3=2x+8

2x-y+11=0 is the eqn

4 0
3 years ago
An agency has 4,000 employees. 2,000 employees have at least two years of college education. 1,000 of those employees have bache
weqwewe [10]

Answer:

1/80 of the agency's employees have PhDs.

Step-by-step explanation:

Given that:

Total number of employees = 4000

Number of employees with bachelors degree = 1000

Fraction of employees with graduate degree = 1/4 of 1000 = 250

1/5 of the employees with graduate degrees have PhD.

Number of employees with PhDs = 1/5 of 250 = 50

Now,

Fraction of PhD employees to total employees = \frac{50}{4000} = \frac{1}{80}

Hence,

1/80 of the agency's employees have PhDs.

5 0
3 years ago
what is the equation of the line, in point slope form, that passes through the points (-1,7) and (-2,3)
Lana71 [14]

Answer: y=4x

Step-by-step explanation:

Slope: y2-y1/ x2-x1

So 7-3/-1-(-2)

6 0
3 years ago
The expression P(z &gt; –1.53) represents the area under the standard normal curve above a given value of z. Find P(z &gt; –1.53
Damm [24]
We can only look up the value in the normal distribution table if the probability of z is LESS than a certain value AND the value is positive.
If the probability of z is MORE than the value, then you need to do 1 minus the probability.
I.e. 1 - 0.93699
[0.93699 is found in the normal distribution table, searching for 1.53]
However, since the value (-1.53) is also negative, you need to do 1 minus AGAIN. 
I.e. 1 - 0.93699

Since you have to do both, the answer should be obtained as follows:
1 - (1 - 0.93699) = 0.93699

Sorry for the terrible explanation :/ 
And apologies if anything is incorrect. Hope this helped though!
6 0
3 years ago
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