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san4es73 [151]
3 years ago
6

Guys help me out with this pre calk on the pic

Mathematics
1 answer:
erastovalidia [21]3 years ago
4 0

Answer:

3/ 2

4/ 2

5/ I don't know

Step-by-step explanation:

I hope that it's a correct answers

I'm so sorry for 5 .

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36 out of 100 randomly selected taxpayers knew about tax incentives for installing energy-saving furnaces. Find a 90% confidence
tresset_1 [31]

Answer:

The 90% confidence interval for the population proportion who knew about the incentives is (0.28, 0.44).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 100, \pi = \frac{36}{60} = 0.6

90% confidence level

So \alpha = 0.1, z is the value of Z that has a pvalue of 1 - \frac{0.1}{2} = 0.95, so Z = 1.645.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.36 - 1.645\sqrt{\frac{0.36*0.64}{100}} = 0.28

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.36 + 1.645\sqrt{\frac{0.36*0.64}{100}} = 0.44

The 90% confidence interval for the population proportion who knew about the incentives is (0.28, 0.44).

7 0
3 years ago
HELP PLS with this geometry problem
seraphim [82]
Angle A = arctan(12/5) = 67.4 degrees

Angle A = arccos(5/13) = 67.4 degrees

yes the answer was the same

8 0
3 years ago
Simplify -3(2x-7) + 5(4x-8).
Ipatiy [6.2K]

Answer:

14x-19

Step-by-step explanation: Now can someone answer my question look at my page

8 0
3 years ago
26.45+4.79+120.02-3.20=
viva [34]
The answer to your question is = 148.06
6 0
3 years ago
Read 2 more answers
Simplify: 9(a + b) + 4(3a + 2b)<br> A) 13a 13b <br> B) 21a + 17b <br> C) 21a + 2b <br> D) 38ab
Aneli [31]
The answer is
B) 21a + 17b
8 0
3 years ago
Read 2 more answers
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