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Lilit [14]
3 years ago
5

Can someone please help me with this maybe get a better understanding if you have the time to tell me?

Mathematics
1 answer:
Colt1911 [192]3 years ago
5 0

Step-by-step explanation:

Absolute value function:

  • |x| = x when x >= 0.
  • |x| = -x when x < 0.

Swim 3 feet under water => |-3|

Stand 20 feet above => |20|

Using the absolute value function,

we have |-3| = 3 and |20| = 20.

Since 3 is less than 20, |-3| < |20|. (C)

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A simple random sample of 125 SAT scores has a mean of 1522. Assume that SAT scores have a population standard deviation of 335.
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Answer:

1463.3\:

Step-by-step explanation:

Since the population standard deviation \sigma, is known, we use the z confidence interval for the mean.

This is given by:

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For a 95% confidence interval we use z=1.96.

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1463.3\:

<u>Interpretation:</u>

We can say with 95% confidence that the interval between 1463.3 and 1580.7 SAT scores contains the population mean based on the sample 125 SAT scores.

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