In a random survey of 226 college students, 20 reported being\\only\" children (

Question

In a random survey of 226 college students, 20 reported beingonly" children (with no siblings). a. Based on the above sample,construct a 98% con dence interval for the proportion of studentsnationwide who are only children? b. Interpret the interval youobtained in part (a).
Assume that the duration of human pregnancies can be describedby a normal distribution with mean 266 days and standard deviation16 days. Suppose a certain obstetrician is currently providingprenatal care to 60 pregnant women. What is the probability thatthe mean duration of these patients' pregnancies will be less than260 days? In a random survey of 226 college students, 20 reported beingonly" children (with no siblings). a. Based on the above sample,construct a 98% con dence interval for the proportion of studentsnationwide who are only children? b. Interpret the interval youobtained in part (a).
Assume that the duration of human pregnancies can be describedby a normal distribution with mean 266 days and standard deviation16 days. Suppose a certain obstetrician is currently providingprenatal care to 60 pregnant women. What is the probability thatthe mean duration of these patients' pregnancies will be less than260 days?

Explanation / Answer

X~Normal(=266, =16) n=60 P(X-bar

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