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goldfiish [28.3K]
3 years ago
9

How to write an answer in Brainly with decorative style like this

Mathematics
1 answer:
Marizza181 [45]3 years ago
7 0

Answer: Go to ur profile and choose the tab that says which questions u have asked then you can edit ur response (a little pencil icon will be on the top right corner of ur question)

Step-by-step explanation:

info above.

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Construct a 95% confidence interval for the population mean, μ. Assume the population has a normal distribution. A random sample
GuDViN [60]

Answer: (628.48,\ 661.52)

Step-by-step explanation:

Given : Sample size : n=16 , which is a small sample (, 30) so we use t-test.

Sample mean : \overline{x}=645 \text{ hours}

Standard deviation : \sigma = 31 \text{ hours}

Significance level : \alpha=1-0.95=0.05

Critical value : t_{n-1,\alpha/2}=2.131

The confidence interval for population mean is given by :-

\overline{x}\pm t_{n-1,\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=645\pm(2.131)\dfrac{31}{\sqrt{16}}\\\\\approx645\pm16.52\\\\=(645-16.52,\ 645+16.52)\\\\=(628.48,\ 661.52)

Hence, a 95% confidence interval for the population mean \mu = (628.48,\ 661.52)

6 0
3 years ago
11 cm<br> 15 cm<br> 17 cm <br> =??
ivann1987 [24]

Answer:

82,5

Step-by-step explanation:

\frac{1}{2} b \times h

\frac{1}{2} 11 \times 15

7 0
3 years ago
Tools
const2013 [10]

Answer:just do the math mate

Step-by-step explanation:

6 0
3 years ago
If m a is 45, then a is ?
dezoksy [38]
Then a is Half of 45 wich is 22.5 I believe. 
5 0
4 years ago
Richie has 27apple he buys 12 more apples how many apples does he have how ?
Yuki888 [10]
27 + 12
39

Hope this helps!
6 0
3 years ago
Read 2 more answers
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