05 Jun Question Problem 1 (25 pts) The cost of 14 models of digitals cameras at
Question
Problem 1 (25 pts)
The cost of 14 models of digitals cameras at a camera specialty store during 2014 was as follows:
340 450 450 280 220 340 290 370 400 310 340 430 270 380
1. Compute mean, median, mode, first and third quartile.
2. Compute the variance, standard deviation, range, interquartile range, coefficient of variation, standard error of the mean and Z scores.
3. Determine whether or not there are outliers? Explain.
4. Determine whether or not the data are skewed? If so, how?
5. Based on the previous results what conclusions can you reach concerning the price of digital cameras at a camera specialty store during 2014.
6. Construct a 90%, 95%, 99% confidence interval for the population mean cost of digitals cameras.
7. Interpret the meaning of each interval.
8. What assumption do you need to make about the population of interest to construct the confidence intervals?
Problem 2 (15 pts)
Consider the sample data for plants A, B, C & D of the above company, which are
tabulated in table 1. Test whether the four means are equal at the 5% level of significance. Perform a test that will compare all 4 means at once. We are not interested in pair-wise comparisons at this stage. Please show all the steps in your calculations.
Problem 3 (30 pts)
Read the article (p. 221 – 225)
«Performance and duration differences between online and paper–pencil tests» and answer the questions below.
Part A.
1. Develop a 95% confidence interval using data from this study.
2. Perform a hypothesis testing using data from this study.
(show all the the appropriate steps).
3. Suggest another statistical technique(s) for the purpose of this study. Explain.
Part B.
For this study briefly describe how the researcher draw conclusions from a sample about a population. Try to be as analytic as possible and use the comments bellow.
1. Determine (or define) the independent variable(s).
2. Determine (or define) the dependent variable(s).
3. Determine (or define) qualitative and quantitative variable(s).
4. Determine (or define) the sample and the population.
5. Describe the statistical method(s) being used and define inferential statistics. Interpret the meaning of p-value.
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.