Question

Need some one to look over my answer for my statistic please!!

Answer 1

1.Which best describes a subset of a population?
i put sample

2.An experiment involves no manipulation of the variables
i put False

3. the most common form used to acquire data is census.
i put False

4. in your own words what is the correct definitions of simple random sample of size n
i put If you know how big the population is, and set each unit to have the same chance of being chosen, then they all have a known chance of being chosen, that chance cannot be zero, choices must be independent otherwise you'd have different probabilities of being chosen, and because they all have the same probability all sets containing n must have the same probability of being chosen too.

5.A simple random sample of size n is any sample that is selected in a manner to guarantee every individual in the population has an equal chance of selection.
I put true

6. Explain the quality of a survey affects on the results
??? am not sure

7. A state school board is adiding a new health class to all middle school curriculums. To help determine the curriculum for the new class they want to determine which health topics are the biggest issues among middle and high school students in the state. A questionnaire was designed and filled out by 300 middle and high school students in the state.

A. identify the population and sample in the scenario.
Population: all middle and high school
Sample: questionnaire filled out by 300 students

B. Suppose on of the questions on the questionnaire is How many times a week do you eat fast food? Identify bias pertaining to this question.
????? i don't know the answer for this one

8. For each of the following determine whether the method used constitutes an SRS. If it does, justify why it does. If it does not explain why not.
a. You decided to number each class 9th, 10th, 11th, 12th separately and then, using a random digit table select 20 students from each class.

my answer is it justify SRS because the digit table select each student at random from each class. Which gives they opportunity for each kid to be pick if they decide to pick all the kids at randomly.

B You number all the students in the entire school and then using a random digit table select 80 students.

I put it justify SRS because each number will not be pick twice if using the random digit table. Each kid will get the opportunity to get pick.

c.You first number the classes 9th, 10th, 11th, 12th and then using a random digit table select on class. the you number all the students in that class and using a random digit table select 80 students from that class.
I put it does not just SRS because one class only is pick and not all the students will get they opportunity to be pick.