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vivado [14]
2 years ago
12

A set of solar batteries is used in a research satellite. The satellite can run on only one battery, but it runs best if more th

an one battery is used. The variance σ2 of lifetimes of these batteries affects the useful lifetime of the satellite before it goes dead. If the variance is too small, all the batteries will tend to die at once. Why? If the variance is too large, the batteries are simply not dependable. Why? Engineers have determined that a variance of σ2 = 23 months (squared) is most desirable for these batteries. A random sample of 30 batteries gave a sample variance of 16.3 months (squared). Using a 0.05 level of significance, test the claim that σ2 = 23 against the claim that σ2 is different from 23.
Mathematics
1 answer:
zavuch27 [327]2 years ago
8 0

Answer:

Hence, we reject H_0 as There  is sufficient evidence to show that population variance is not 23

Step-by-step explanation:

From the question we are told that:

Sample size n=30

Variance \sigma= 16.8

Significance Level \alpha=0.05

\sigma = 23

Genet=rally the Hypothesis are as follows

Null H_0=\sigma^2=23

Alternative H_a=\sigma^2 \neq 23

Generally the equation for Chi distribution t is mathematically given by

t test statistics

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

X^2=\frac{(30-1)16.8^2}{23}

X^2=355.86

Therefore

Critical Value

P_{\alpha,df}

Where

df=29

P_{\alpha,df}=16.0471 and 45.7223

X^2=45.7223

Hence, we reject H_0 as There  is sufficient evidence to show that population variance is not 23

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Answer:

a) ⅓ units²

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Step-by-step explanation:

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y(y-1) = 0

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x = 0, 2

Area

Integrate: x²/4 - x/2

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(8/12 - 4/4) - 0

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Area = ⅓

Volume:

Squares and then integrate

Integrate: [x²/4]² - [x/2]²

Integrate: x⁴/16 - x²/4

x⁵/80 - x³/12

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About the x-axis

x² = 4y

x² = 4y²

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3 years ago
Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used. Match each function with the description
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Answer:

Step-by-step explanation:

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3 years ago
If the function graphed is f(x), find f(1).
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Draw a vertical line through 1 on the x axis. Extend this vertical line as far up and down as you can.

Notice how the vertical line crosses the blue curve. Mark this point. Then draw a horizontal line from this point to the y axis. The horizontal line will touch -4 on the y axis. So that means the point (1,-4) is on the curve.

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3 years ago
Algebra public opinion polls reported in newspapers are usually given with a margin of error. for example, a poll with a margin
sweet-ann [11.9K]

Answer:

Minimum percent of the vote that candidate Towne is expected to recieve:

m=51% - 6.3% * 51% =47.787%

Maximum percent of the vote that candidate Towne is expected to recieve:

M=51% + 6.3% * 51% = 54.213%

Solution:

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M=51% + 3.213%

M=54.213%


8 0
3 years ago
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