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Allisa [31]
3 years ago
15

Please i need help!

Mathematics
1 answer:
skelet666 [1.2K]3 years ago
5 0
1. (C) 3:5
2. 30 minutes
3. (B) 46
4. (D) $8 for 3.5 kg
5. 20 hours
6. 3:5, 6:10, 9:15, 12:20
7. 56cm, 1.8ft, 20in
8. (D) 50.75
9. $13.50
10. 1,944 minutes
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Based upon extensive data from a national high school educational testing program, the standard deviation of national test score
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Answer:

The standard error of the mean is 10.11 points

Step-by-step explanation:

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sd = 115 points, n = 500, degree of freedom = n-1 = 500-1 = 499, assuming a 95% confidence level, t-value corresponding to 499 degrees of freedom and 95% confidence level is 1.96501

Standard error of mean = 1.96501×115/√500 = 10.11 points (to the nearest 100th)

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