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Hatshy [7]
3 years ago
5

4. For the expression below you are allowed to put in as many or as few brackets as you like. What

Mathematics
1 answer:
hichkok12 [17]3 years ago
8 0

Answer:

-1

Step-by-step explanation:

All of them equal negative one and -1*-1 equals negative 1

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Assume the sample variances to be continuous measurements. Find the probability that a random sample of 25observations, from a n
konstantin123 [22]

Answer:

a) P(4S^2 > 4*9.1) = P(\chi^2_{24} >36.4) = 0.0502

b)P(13.848Step-by-step explanation:

Previous concepts

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

For this case we assume that the sample variance is given by S^2 and we select a random sample of size n from a normal population with a population variance \sigma^2. And we define the following statistic:

T = \frac{(n-1) S^2}{\sigma^2}

And the distribution for this statistic is T \sim \chi^2_{n-1}

For this case we know that n =25 and \sigma^2 = 6 so then our statistic would be given by:

\chi^2 = \frac{(n-1)S^2}{\sigma^2}=\frac{24 S^2}{6}= 4S^2

With 25-1 =24 degrees of freedom.

Solution to the problem

Part a

For this case we want this probability:

P(S^2 > 9.1)

And we can multiply the inequality by 4 on both sides and we got:

P(4S^2 > 4*9.1) = P(\chi^2_{24} >36.4) = 0.0502

And we can use the following excel code to find it: "=1-CHISQ.DIST(36.4,24,TRUE)"

Part b

For this case we want this probability:

P(3.462 < S^2

If we multiply the inequality by 4 on all the terms we got:

P(3.462*4 < 4S^2 < 4*10.745)= P(13.848< \chi^2And we can find this probability like this:P(13.848And we use the following code to find the answer in excel: "=CHISQ.DIST(42.98,24,TRUE)-CHISQ.DIST(13.848,24,TRUE)"

8 0
2 years ago
Can someone help me with this please? I will mark you brainliest
lina2011 [118]

Answer:

On the vertical axis, place frequencies. Label this axis "Frequency".

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On the horizontal axis, place the lower value of each interval. ...

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On the horizontal axis, place the lower value of each interval. ...

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On the horizontal axis, place the lower value of each interval. ...

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Step-by-step explanation:

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oksian1 [2.3K]

Answer:

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Step-by-step explanation:

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