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LenKa [72]
3 years ago
6

Matika knows that 230 - 39 = 191. How can she use that, to help her solve 233 - 42? Use the lines below to answer.

Mathematics
1 answer:
amid [387]3 years ago
8 0

Answer:

Step-by-step explanation:

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The American Management Association is studying the income of store managers in the retail industry. A random sample of 49 manag
VashaNatasha [74]

Answer:

a) The 95% confidence interval for the income of store managers in the retail industry is ($44,846, $45,994), having a margin of error of $574.

b) The interval mean that we are 95% sure that the true mean income of all store managers in the retail industry is between $44,846 and $45,994.

Step-by-step explanation:

Question a:

We have to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a p-value of 1 - 0.025 = 0.975, so Z = 1.96.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.96\frac{2050}{\sqrt{49}} = 574

The lower end of the interval is the sample mean subtracted by M. So it is 45420 - 574 = $44,846.

The upper end of the interval is the sample mean added to M. So it is 45420 + 574 = $45,994.

The 95% confidence interval for the income of store managers in the retail industry is ($44,846, $45,994), having a margin of error of $574.

Question b:

The interval mean that we are 95% sure that the true mean income of all store managers in the retail industry is between $44,846 and $45,994.

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3 years ago
The holding period of property acquired by gift may begin on:
maw [93]

Answer:

Step-by-step explanation:

6 0
3 years ago
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Two angles with measures (6x + 60) and (90) are supplementary. What is the value of x?
marshall27 [118]
Supplementary angles add up to 180, so 
6x+60+90 = 180 and solve for x
6x= 30
x=5
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3 years ago
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3x+2y-5z=-1<br> 4x-3y+2z=-13<br> 2x-5y+4z=-9
Lina20 [59]

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I just guessed but here

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3 years ago
Which is greater 45 hundredths or 6 tenths
MA_775_DIABLO [31]
45 hundredths is greayer than 6 tenth because 45 is in the hundredths spot and 6 is in the tenth spot
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3 years ago
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