Nurses wondered if birth weights of babies are going up. They knew what the average birth weight of a baby last year was 7.6 pound. A random sample of 65 weights of babies at the hospital where the nurses work gave an average birth weight of 7.9 pounds. Which of the following is true about using the one-sample z-methods?
- The nurses can use the sample data to make an inference about birth weights for all babies born this year.
- The nurses should not use the sample data to make an inference about birth weights of babies born at the hospital they work at or any other hospital since a sample of 65 is not large compared to the number of babies born at this hospital this year.
- The nurses should not use the sample data to make an inference about birth weights of babies born at the hospital they work at orany other hospital since a random sample of all babies was not taken.
- The nurses can use the sample data to make an inference about birth weights at this hospital, but should be cautious about making inferences about birth weights beyond this hospital