Statistics 5

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Using the data set you collected in Week 1, excluding the super car outlier, you should have calculated the mean and standard deviation during Week 2 for price data.  Along with finding a p and q from Week 3.  Using this information, calculate two 95% confidence intervals.  For the first interval you need to calculate a T-confidence interval for the sample population.  You have the mean, standard deviation and the sample size, all you have left to find is the T-critical value and you can calculate the interval.  For the second interval calculate a proportion confidence interval using the proportion of the number of cars that fall below the average.  You have the p, q, and n, all that is left is calculating a Z-critical value,

Make sure you include these values in your post, so your fellow classmates can use them to calculate their own confidence intervals.  Once you calculate the confidence intervals you will need to interpret your interval and explain what this means in words.   

Do the confidence intervals surprise you, knowing what you have learned about confidence intervals, proportions and normal distribution?  Please the Week 5 Confidence T-Interval Mean and Unknown SD PDF and the Week 5 Confidence Interval Proportions PDF at the bottom of the discussion.  This will give you a step by step example on how to help you calculate this using Excel. These PDFs will also help you in Quizzes section.

“Before you post your initial discussion, you must submit it in the assignment area in a Word file, so its originality can be checked by Turnitin.com. I will take points off if you do not do this. Your score will appear in the same place you submit your file. It can take up to 24 hours for a score to return, but usually, it is less than 30 minutes. Before you post your discussion in the activity, make sure your originality index (%) is less than 15. If it is greater than 15%, rewrite your discussion, submit it again in the assignment area and check the %. Keep doing this until your % is less than 15%. Only post your discussion when the % is less than 15. Here are two hints to get your score below 15%: 1) leave your list of supporting material out of the file you submit for checking (don't forget to add these back when you post your discussion in the forum) and 2) use your own words, not quotes.

Once you have posted your initial discussion, you must reply to at least two other learner's post. Each post must be a different topic. So, you will have your initial post from one topic, your first follow-up post from a different topic, and your second follow-up post from one of the other topics. Of course, you are more than welcome to respond to more than two learners.”

Instructions: You must respond to at least 2 other students. Responses may include direct questions.

In your first peer posts, pick another confidence level, i.e. 90%, 99%, 97%, any other confidence level is fine.  Have fun and be creative with it and calculate another T-confidence interval and interpret your results.  Compare your results to that of the initial 95%, how much do they differ?  How useful can this type of information be when you go to buy a new car, or even a house?  

In your second peer posts, pick another confidence level, i.e. 90%, 99%, 97%, any other confidence level is fine.  Have fun and be creative with it and calculate another proportion interval and interpret your results.  Compare your results to that of the initial 95%, how much do they differ?  How useful can this type of information be when you go to buy a new car, or even a house?  

Make sure you include your data set in your initial post as well.  In this discussion you should be calculating 4 total confidence intervals.  Two T-confidence intervals and Two proportion confidence intervals.  Two in your initial post and then one in each of your response posts.

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