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mario62 [17]
4 years ago
5

Bella has sampled the heights of 30 students at Ridgemont High and obtained a mean of 64.2 inches. He constructs a 90% confidenc

e interval, which turns out to be (61.0, 67.4). What is the ma
A) 2.1 inches

B) 3.2 inches

C) 4.2 inches

D) 6.4 inches rgin of error?
Mathematics
1 answer:
barxatty [35]4 years ago
7 0
The correct answer for the question that is being presented above is this one: "<span>C) </span>4.2 inches." Bella has sampled the heights of 30 students at Ridgemont High and obtained a mean of 64.2 inches. He constructs a 90% confidence interval, which turns out to be (61.0, 67.4). The margin of error is <span>C) </span><span>4.2 inches </span>
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In order to solve this, remember PEMDAS. First, start with solving whatever is in parentheses. Then, move on to exponents. Then, complete the multiplication and division. Lastly, add or subtract anything remaining. Omit any steps that aren't present. 

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<span>1 – 5 + 1 × (4 × 4 – 31) × 8
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