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Vladimir [108]
1 year ago
8

О

Mathematics
1 answer:
Tatiana [17]1 year ago
6 0

Answer:

b

Step-by-step explanation:

B

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1. Find the 90% Cl for the population mean if sample
Elden [556K]

Answer:

The answer is below

Step-by-step explanation:

1)

mean (μ) = 12, SD(σ) = 2.3, sample size (n) = 65

Given that the confidence level (c) = 90% = 0.9

α = 1 - c = 0.1

α/2 = 0.05

The z score of α/2 is the same as the z score of 0.45 (0.5 - 0.05) which is equal to 1.65

The margin of error (E) is given as:

E=Z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} } =1.65*\frac{2.3}{\sqrt{65} } =0.47

The confidence interval = μ ± E = 12 ± 0.47 = (11.53, 12.47)

2)

mean (μ) = 23, SD(σ) = 12, sample size (n) = 45

Given that the confidence level (c) = 88% = 0.88

α = 1 - c = 0.12

α/2 = 0.06

The z score of α/2 is the same as the z score of 0.44 (0.5 - 0.06) which is equal to 1.56

The margin of error (E) is given as:

E=Z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} } =1.56*\frac{12}{\sqrt{45} } =2.8

The confidence interval = μ ± E = 23 ± 2.8 = (22.2, 25.8)

8 0
3 years ago
Find the average speed Distance:1,375km Time: 2 hours 5 minutes
Murljashka [212]

Answer:

550km/h

Step-by-step explanation:

v (speed) = d/t

v = 1375/2.5

v =550

6 0
2 years ago
A currency exchange will convert 1
Eddi Din [679]

Answer: a) 26297.50 b) 124.992870045

Step-by-step explanation:

a) 105.19*250=26297.50

b) 13148/105.19= 124.992870045

6 0
3 years ago
Operations with fractions
romanna [79]
The asnwer is 2/8 (simplified it would be 1/4)
5 0
2 years ago
Read 2 more answers
Chu want some points? Answer correctly n ill give em to ya;)<br><br> 4+7
Andrej [43]

Answer:

11

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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