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beks73 [17]
3 years ago
9

In the lab tab in the data file, there is data on the IQs for first graders at a university lab school. a. Calcualte a point est

imate of the mean value of IQ for the population of first graders at this school. What estimator did you use? b. Calculate a point estimate of the IW value that separates the lowert 50% of all such students from the highest 50% of students. c. Calculate a 99% confidence interval for the population mean. What sampling distribution did you use? Why? d. Test the hypothesis that this population of first graders is not smarter nor less smart than the wider population (which has average IQ equal to 100).

Mathematics
1 answer:
charle [14.2K]3 years ago
7 0

Answer:

a. 113.72

b. 115

c. 107, 120

d. 100

Step-by-step explanation:

Hypothesis is seen as an assumption, an idea that is proposed for the sake of argument so that it can be tested to see if it might be true. In the scientific method, the hypothesis is constructed before any applicable research has been done, apart from a basic background review.

Sampling distribition can be seen as the distribution of frequencies of a range of different outcomes that could possibly occur for a statistic of a population.

Please go to attachment for the detailed analysis.

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ehidna [41]

Answer:

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Step-by-step explanation:

see the attached figure to better understand the problem

we know that

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SA=2B+PH

where

B is the area of the triangular base

P is the perimeter of the triangular face

H is the height of the prism

<em>Find the area of the base B</em>

B=\frac{1}{2}(42)(20)=420\ m^{2}

<em>Find the perimeter of the base P</em>

P=(42+29+29)=100\ m

we have

H=16\ m

substitute the values

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8 0
3 years ago
How to find the hypotenuse of a right angled triangle using trigonometry?
Ghella [55]
It depends on whether you have "Perpendicular" or "base"
If you have perpendicular then, you can use the formula:
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If you have base then, you can use the formula:
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4 0
3 years ago
Write the quadratic equation that has roots -1-rt2/3 and -1+rt2/3 if its coefficient with x^2 is equal to 1
weeeeeb [17]

The equation of the quadratic function is f(x) = x²+ 2/3x - 1/9

<h3>How to determine the quadratic equation?</h3>

From the question, the given parameters are:

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The quadratic equation is then calculated as

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Substitute the known values in the above equation

So, we have the following equation

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This gives

f(x) = (x + \frac{1+\sqrt{2}}{3})(x + \frac{1-\sqrt{2}}{3})

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Read more about quadratic equations at

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7 0
1 year ago
(this is separate)
leva [86]

Answer: 2/1

Step-by-step explanation:

3 0
2 years ago
I’m not sure on how to do this so could you show me step by step?
likoan [24]

Answer:

yes

Step-by-step explanation:

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3 years ago
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