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A statistics instructor wants to measure the effectiveness of his teaching skills in a class of 102 students ( N = 102).
A statistics instructor wants to measure the effectiveness of his teaching skills in a class of 102 students (N = 102). He selects students by waiting at the door to the classroom prior to his lecture and pulling aside every third student to give him or her a questionnaire.
- Is this sample design an example of random sampling? Explain.
Assuming that all students attend his class that day, how many students will the instructor select to complete his questionnaire?
Suppose you were going to conduct a survey of visitors to your campus. You want the survey to be as representative as possible.
a. How would you select the people to survey?
b. Why would that be your best method?
In a school band, 9 kids play string instruments, 10 kids play woodwind instruments, 7 kids play brass instruments, and 4 kids play percussion instruments.
a. What is the probability that you randomly select a kid who plays a string or percussion instrument?
b. What is the probability that you randomly select a kid who does not play a brass instrument?
