28 Jun Statistic 200
| Student | N | x̅ | Ps | Student | N | x̅n | Ps | |
| Acopan | 40 | 50 | 0.22 | Harris | 60 | 30 | 0.40 | |
| Ambol | 42 | 52 | 0.18 | Jacobs | 62 | 32 | 0.38 | |
| Anderson | 44 | 54 | 0.22 | Johnson | 64 | 34 | 0.36 | |
| Attai | 46 | 56 | 0.24 | Kurata | 66 | 36 | 0.34 | |
| Broseker | 48 | 58 | 0.26 | Mendoza | 68 | 38 | 0.32 | |
| Buchheit | 50 | 60 | 0.28 | Monyei | 70 | 40 | 0.26 | |
| Bullock | 52 | 62 | 0.30 | Munshi | 72 | 42 | 0.24 | |
| Caywood | 54 | 64 | 0.32 | Pickering | 74 | 44 | 0.42 | |
| Cox-Martinez | 56 | 66 | 0.34 | Rager | 76 | 46 | 0.44 | |
| Eickhoff | 58 | 68 | 0.36 | Ritchey | 78 | 48 | 0.46 | |
| Fox | 80 | 50 | 0.35 | Rosen | 86 | 42 | 0.20 | |
| Gray | 82 | 48 | 0.25 | Sekamwa | 88 | 36 | 0.22 | |
| Hampton | 84 | 44 | 0.15 | Turner | 90 | 46 | 0.30 |
Question 1. How size of the sample affects the size of Confidence Interval?
Problem 2. Compute the 90% confidence interval for population mean based on the following sample of seven: 10, 13, 14, 16, 17, 20, 22.
Problem 3. A sample has N numbers. The mean of your sample is x̅. Take value of N and x̅ from the table above. Case A: You know the standard deviation of the population is σ=10.
What is the 95% confidence interval on the population mean? Tip: use z-factor from the Normal Distribution Table.
Case B: Now assume that you do not know the population standard deviation, but the standard deviation of sample is given, s=20. Find the 90% confidence interval for the population mean? Tip: use t-factor from the t-Distribution Table.
Problem 4. An average waiting time in some Emergency Room for N randomly selected patients is x̅ minutes (sample mean). Take value of N and x̅ from the table above.
Find Margin of Error and Confidence Interval for the population mean of waiting time in that hospital. Population standard deviation is given, σ=15 min, and Confidence Level is 99%.
Problem 5. In a poll of N people sample proportion is ps (value of N and ps is given in the Table above). Compute a 95% confidence interval for the population proportion.
Problem 6. Write any 5-8 numbers between 1 and 40. They will represent sample data. Calculate Sample Mean (x) and Sample Standard Deviation (s). We don’t know the value of population mean because we don’t have data for the whole population. But using this week study material we can predict interval that holds population mean: x – is calculated sample mean, E is a Margin of Error. This is the case when we don’t know population standard deviation (case 2), but we have calculated sample standard deviation (s). Here is the formula for Margin of Error:
n – sample size (5,6,7,or 8). ta/2 is not ta divided by 2, it’s just t-value from the given Table A-3. To calculate Margin of Error (E) we have to use Appendix Table A-3 for t-Distribution (Table A-3. t-Distribution) The Degree of Freedom in this table is (n-1), sample size minus one. We will create the interval with 90% confidence (0.90). Significance Level α = 1 – Conf.Level = 1 – 0.90 = 0.10 On Bell-shaped curve, it will leave 10% of the area in two tails outside confidence zone. That means, in attached t-Table you should use the column with Area in Two Tails equal 0.10. So, here are your steps: 1) Write 5-8 numbers between 1 and 40; this will be your sample data. 2) Calculate sample mean (x) and sample standard deviation (s). 3) Use Appendix Table A-3. t-Distribution to find t-value. 4) Calculate Margin of Error (E) using the formula above. 5) Write Confidence Interval for Population Mean: μ= x ± E
Start a New Thread
Our website has a team of professional writers who can help you write any of your homework. They will write your papers from scratch. We also have a team of editors just to make sure all papers are of HIGH QUALITY & PLAGIARISM FREE. To make an Order you only need to click Ask A Question and we will direct you to our Order Page at WriteDemy. Then fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.
Fill in all the assignment paper details that are required in the order form with the standard information being the page count, deadline, academic level and type of paper. It is advisable to have this information at hand so that you can quickly fill in the necessary information needed in the form for the essay writer to be immediately assigned to your writing project. Make payment for the custom essay order to enable us to assign a suitable writer to your order. Payments are made through Paypal on a secured billing page. Finally, sit back and relax.
About Writedemy
We are a professional paper writing website. If you have searched a question and bumped into our website just know you are in the right place to get help in your coursework. We offer HIGH QUALITY & PLAGIARISM FREE Papers.
How It Works
To make an Order you only need to click on “Order Now” and we will direct you to our Order Page. Fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.
Are there Discounts?
All new clients are eligible for 20% off in their first Order. Our payment method is safe and secure.