Math Homework Help

Questions 1-2. A given poll states “54% of fifth graders read at or above the fifth-grade-level.”  

1. If

there is a stated margin of error of +/- 2.5%, what is the 95% confidence interval for this statistic? (enter percentages rounded to the tenths place)

2.Write meaningful sentence interpreting your interval.

Americans age 18 and over conducted in May of 2013 found that 80% of the respondents “strongly agree” that K-12 schools should teach critical thinking to children.  

3. What is the population represented here?

4. What is the sample size of this poll?

5. If the margin of error is 3.2%, calculate the 95% confidence interval for this poll? (enter percentages rounded to the tenths place)

6. Write meaningful sentence interpreting your interval.

Questions 7-10. A recent poll of 920 Facebook users posed the following question: “Thinking just about your Facebook profile, how many friends do you currently have in your network?” The pie chart below represents their responses.

7. What is the population represented here?

8. What is the sample?

9. If the margin of error is 3.3%, what is the 95% confidence interval for those who have more than 100, but less than 251 friends? (enter percentages rounded to the tenths place)

10. Write meaningful sentence interpreting your interval.

11. What is a population? Choose the correct answer below. a.) A population is a group that exhibits characteristics typical of those possessed by the target sample. b.) A population is a set of data. c.) A population is the set containing all the people or objects whose properties are to be described and analyzed by the data collector. d.) A population is the set of all the properties that can be assigned to any people or objects in a given sample.

12. What is a sample? Choose the correct answer below. a.) A sample is a subset or subgroup of the people or objects whose properties are to be described and analyzed by the data collector. b.) A sample is a subset or subgroup of the population. c.) A sample is obtained in such a way that every element in the population has an equal chance of being selected. d.) A sample contains one or many populations.

13. A random sample of 2334 college students were asked their major. The top five responses and the percentage of students who named each of the top five majors are shown in the graph.  Use the graph to answer the questions. 

The margin of error is 2.1%.

We can be 95% confident that between ____% and ___% of students in the population are majoring in math. (Use ascending order. Round to the nearest tenth as need.