Final answer:
Proportion calculations for years of experience in nurses require the complete set of data which is not provided. A random sample of 30 students from a lecture of 200 can be selected using random number generation.
Step-by-step explanation:
To calculate the proportion of nurses with five or more years of experience, we would need the complete frequency distribution of the years of experience from the survey. Unfortunately, the information provided is not sufficient to derive an answer. Similarly, to determine the proportion of nurses with 10 or fewer years of experience, we again would need the complete frequency distribution data.
Selecting a random sample from a lecture class can be done using random number generation for the 200 students. Assign each student a number from 1 to 200, use a random number generator to produce 30 unique numbers, and select the students corresponding to those numbers.
For a stratified sample based on class standing, divide the entire college student population into subgroups (strata) based on their class standing (freshman, sophomore, junior, senior). Randomly select from each strata a number of students proportional to the size of the strata to make up the overall sample.