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Adolescent fertility rate (births per 1,000 women ages 15-19): 90% Confidence Level Adolescent fertility rate (births...

Adolescent fertility rate (births per 1,000 women ages 15-19): 90% Confidence Level

Adolescent fertility rate (births per 1,000 women ages 15-19)
19.8208
9.5292
43.7244
5.6706
5.0092
18.7038
8.1462
51.2912
20.0066
11.336
30.4734
16.1048
17.8444
7.1886
14.9762
37.4372
22.0306
10.286
34.1514
28.9362
  • Point Estimate:
    • Alpha-level:
    • t-score:
    • Sample Standard Deviation:
  • Margin of Error:
  • Confidence Interval:
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Homework Answers

Answer #1

Sample size = n = 20

Degrees of freedom = n - 1 = 20 - 1 = 19

Point estimate = Sample mean = = 20.6333

Alpha-level =  0.10

t-score = 1.729

( From t table)

Sample Standard Deviation = s = 13.1639

Here E is a margin of error.

We have to construct a 90% confidence interval.

Formula is

So confidence interval is ( 20.6333 - 5.0898 , 20.6333 + 5.0898) = > ( 15.5436 , 25.7231)

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