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sergij07 [2.7K]
3 years ago
12

Can some one please help meee with a-c

Mathematics
1 answer:
MrRa [10]3 years ago
5 0
A. (-4)+(-5)-(-6) = (-9)-(-6) = -9 + 6 = -3
b. (-2)+(-3)-(-4)-(+5) = (-5) + 4 - 5 = -1 - 5 = -6
c. (-0.3)-(-0.3) = (-0.3) + 0.3 = 0
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To solve for the confidence interval for the true average percentage elongation, we use the z statistic. The formula for confidence interval is given as:

Confidence interval = x ± z σ / sqrt (n)

where,

x = the sample mean = 8.63

σ = sample standard deviation = 0.79

n = number of samples = 56

 

From the standard distribution tables, the value of z at 95% confidence interval is:

z = 1.96

 

Therefore substituting the known values into the equation:

Confidence interval = 8.63 ± (1.96) (0.79) / sqrt (56)

Confidence interval = 8.63 ± 0.207

Confidence interval = 8.42, 8.84

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3 years ago
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Anna11 [10]

Answer:

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