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Softa [21]
3 years ago
10

Studying mathematics in the night is better than the morning study and why?

Mathematics
1 answer:
Goryan [66]3 years ago
6 0
Honestly, I believe you should study while you're still up (if it's not too late). Your brain isn't really awake that early in the morning and you might not even remember anything. If you have have a test later in the day, study through out your classes and lunch and you should be fine. Another tip is to go with you gut instinct. Don't second guess yourself because that can mess you up.
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An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. He believes that
Llana [10]

Answer:

We need a sample size of at least 170.

Step-by-step explanation:

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

\alpha = \frac{1-0.8}{2} = 0.1

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.1 = 0.9, so z = 1.28

Now, find M as such

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

In which \sigma is the standard deviation of the population(square root of the variance) and n is the size of the sample.

How large of a sample would be required in order to estimate the mean per capita income at the 80%80% level of confidence with an error of at most $0.52$ 0.52?

A sample size of at least n, in which n is found when M = 0.52, \sigma = \sqrt{34.81} = 5.9

So

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

0.58 = 1.28*\frac{5.9}{\sqrt{n}}

0.58\sqrt{n} = 1.28*5.9

\sqrt{n} = \frac{1.28*5.9}{0.58}

(\sqrt{n})^{2} = (\frac{1.28*5.9}{0.58})^{2}

n = 169.5

Rounding up

We need a sample size of at least 170.

6 0
3 years ago
I NEED HELP ASAP! 50 points:A national restaurant chain claims that their servers make an average of $12.85 in tips per hour, wi
liraira [26]
THe answer will be <span>97.44%

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7 0
3 years ago
Read 2 more answers
Evaluate 9 - 3 * 2 + 4.
iogann1982 [59]

Answer:

7

Step-by-step explanation:

9 - 3 * 2 + 4

9-6+4

3+4

7

8 0
3 years ago
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X<br>ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
frosja888 [35]

Answer:

Ghww wt

Step-by-step explanation:

6h8d dgs gc

5 0
3 years ago
A party rental company has chairs and tables for rent. The total cost to rent 4 chairs and 8 tables is $89 . The total cost to r
puteri [66]
Let C = cost to rent each chairLet T = cost to rent each table

 4C + 8T = 73
2C + 3T = 28 
Multiply the 2nd equation by (-2) and then add the equations together 

  4C + 8T = 73
-4C - 6T = -56
 2T = 17T = 17/2 = 8.5

 Plug this in to the 1st equation to solve for C
 4C + 8(17/2) = 73
4C + 68 = 73
4C = 5C = 5/4 = 1.25
 So the cost to rent each chair is $1.25 and the cost to rent each table is $8.50 
7 0
3 years ago
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