Question
In: Statistics and Probability
1. One of the variables collected in the North Carolina Birth Registry is pounds gained during pregnancy....
1. One of the variables collected in the North Carolina Birth Registry is pounds gained during pregnancy. According to data from the entire registry in 2001, the number of pounds gained during pregnancy was approximately normally distributed with a mean of 30.23 pounds and a standard deviation of 13.84 pounds. Suppose we now considered these to be estimates from a sample of n observations. What would be our 95% confidence interval around this estimate of the mean if:
a. The sample size n = 5?
b. The sample size n = 25?
c. The sample size n = 121?
d. What do these results tell you in practical terms about the relative benefits of increasing the sample size from 5 to 25? From 25 to 121?
Solutions
Expert Solution
a)
b)
c)
d) frm abvoe we can see as we increase sample size ; the confidence interval will proivide more precise range due to reduction in variability
orchestra answered 2 years agoRelated Solutions
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My goal is to use the data set to test if there is an
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Birth and infant death data for all children born in the state of North Carolina dating...
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in 2001 contains 120,300 records. The data represents a random
sample of 800 of those births and selected variables. My goal is to
use the data set to test if there is an association between
premature births (PREMIE) and smoking during pregnancy (SMOKE)
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Birth and infant death data for all children born in the state of North Carolina dating...
Birth and infant death data for all children born in the state
of North Carolina dating back to 1968. The data set for the births
in 2001 contains 120,300 records. The data represents a random
sample of 800 of those births and selected variables. My goal is to
use the data set to test if there is an association between
premature births (PREMIE) and smoking during pregnancy (SMOKE)
using α=.05. I wanted to see if someone could check the
interpretation...
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smoked during her pregnancy. Download the data from the table by
clicking the download table icon A detailed description of the
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The weight gain of women during pregnancy has an important effect on the birth weight of...
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Country
n
ȳ
s2
Egypt
6
3.8
5.76
Kenya
10
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Total
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pts)
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