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mrs_skeptik [129]
3 years ago
10

Standard sheet of paper in the United States is 11 inches long and 8.5 inches wide. Each inch is 2.54 cm. How long and wide is a

standard sheet of paper in centimeters
Mathematics
1 answer:
Virty [35]3 years ago
3 0
27.94 cm long, 21.59 long :]
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(1 point) A recent report for a regional airline reported that the mean number of hours of flying time for its pilots is 56 hour
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Answer:

(53.812 ; 58.188) ; 156

Step-by-step explanation:

Given that :

Sample size (n) = 51

Mean (m) = 56

Standard deviation (σ) = 9.5

α = 90%

Using the relation :

Confidence interval = mean ± Error

Error = Zcritical * (standard deviation / sqrt (n))

Zcritical at 90% = 1.645

Error = 1.645 * (9.5 / sqrt(51))

Error = 1.645 * 1.3302660

Error = 2.1882877

Hence,

Confidence interval :

Lower boundary = 56 - 2.1882877 = 53.8117123

Upper boundary = 56 + 2.1882877 = 58.1882877

Confidence interval = (53.812 ; 58.188)

2.)

Margin of Error (ME) = 1.25

α = 90%

Sample size = ((Zcritical * σ) / ME)^2

Zcritical at 90% = 1.645

Sample size = ((1.645 * 9.5) / 1.25)^2

Sample size = (15.6275 / 1.25)^2

Sample size = 12.502^2 = 156.3000

Sample size = 156

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Step-by-step explanation:


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Answer:

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Step-by-step explanation:

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