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Natali [406]
3 years ago
10

Can somebody plz help!!​

Mathematics
1 answer:
Mashcka [7]3 years ago
4 0

Answer:

A

Step-by-step explanation:

there are 4 columns and 1 drama so it equals 1/4

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An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in California.
pishuonlain [190]

Answer:

The 80% confidence interval for the mean per capita income in thousands of dollars is between $21.3 and $21.9.

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 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 = 1.28*\frac{12.5}{\sqrt{3839}} = 0.3

The lower end of the interval is the sample mean subtracted by M. So it is 21.6 - 0.3 = $21.3.

The upper end of the interval is the sample mean added to M. So it is 21.6 + 0.3 = $21.9.

The 80% confidence interval for the mean per capita income in thousands of dollars is between $21.3 and $21.9.

7 0
3 years ago
Read 2 more answers
Please help will reward brainliest
taurus [48]
√8 = 2√2 = 2√2 = 2 x 1.414... =2.828....(irrational number between 2 and 3)

2.π = 6.283...........................................(irrational number between 6 and 7)

7/3 = 2.33333.. (mind you a repeating decimal is a rational number), then:
7/3 = 2.33333 ......................................(rational number between 2 and 3)

e/2 = 1.359...........................................(irrational number between 1 and 2)

3/2 = 1.5 ..............................................(rational number between 1 and 2)
4 0
3 years ago
Tanh(2a)==1/2 then a=?​
stepladder [879]

Answer:

2a=1/2

a=1/4

Step-by-step explanation:

6 0
3 years ago
PLZ HELP ON SMALL QUESTION. THANKS
MrMuchimi

true i think. help me with my question tho?

5 0
3 years ago
(02.03)Tony bought 3 tickets to a concert for $78. How much will it cost for 6 tickets to the concert if all tickets have the sa
djverab [1.8K]

Answer:

26$ Per ticket

missing number is 156$

Step-by-step explanation:

Find how much each ticket is by dividing 78 by 3 which is 26 the multiply 26 and 6 to find the missing number hope this helped :)

8 0
3 years ago
Read 2 more answers
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