Marina babysits her neighbours' kids once a week and earns $40 each night. She loves coffee so she treats herself three times a
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Answer:
c. 9.5 lb < mu < 11.1 lb.
Step-by-step explanation:
Confidence interval can be stated as M±ME where
- M is the sample mean (10.3)
- ME is the margin of error
margin of error (ME) around the mean can be calculated using the formula
ME= where
- z is the corresponding statistic in 95% confidence level (1.96)
- s is the standard deviation of the sample (2.4)
- N is the sample size (37)
Putting thesenumbers in the formula we get:
ME= ≈ 0.7733 ≈ 0.8
Then the 95% confidence interval would be 10.3 ± 0.8