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emmainna [20.7K]
3 years ago
10

What is the value of the expression with a = -1.4 and b = -2.7?

Mathematics
1 answer:
V125BC [204]3 years ago
5 0

Answer:

C) -1.3

Step-by-step explanation:

|a| + b

Substitute a = -1.4  b = -2.7

|-1.4| + -2.7

Absolute values are positive

1.4 -2.7

-1.3

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a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval
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We cannot calculate the confidence interval without the sample size.  However, for the second question, the sample size needed would be 49.

The formula we use is

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Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49
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