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Week 6 Lecture Statistics For Decision Making

Week 6 Lecture Statistics For Decision Making. B Heard. Not to be used, posted, etc. without my expressed permission. B Heard. Week 6 Lab. There are four parts to the lab this week: Part 1: Normal Distributions and Birth Weights in America

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Week 6 Lecture Statistics For Decision Making

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  1. Week 6 LectureStatistics For Decision Making B Heard Not to be used, posted, etc. without my expressed permission. B Heard

  2. Week 6 Lab • There are four parts to the lab this week: • Part 1: Normal Distributions and Birth Weights in America • Part 2: Central Limit Theorem and Age Distributions in the United States • Part 3: Finding z and t scores for Confidence Intervals • Part 4: Bob’s Candies (Using Confidence Intervals to decide a course of action) Not to be used, posted, etc. without my expressed permission. B Heard

  3. Week 6 Lab Part 1………. Not to be used, posted, etc. without my expressed permission. B Heard

  4. Week 6 Lab • Birth Weights in America, Page 245 Not to be used, posted, etc. without my expressed permission. B Heard

  5. Week 6 Lab • Birth Weights in America, Number 1, part a • You can see that the graph has a mean of less than 7.5, so the 37 to 39 Weeks Gestation period is the obvious choice. Not to be used, posted, etc. without my expressed permission. B Heard

  6. Week 6 Lab Birth Weights in America, Number 2, part b We will identify the mean birth weight and standard deviation for the 32 to 35 week gestation period for this problem. The mean is 5.73 lbs and the standard deviation is 1.48 lb. Not to be used, posted, etc. without my expressed permission. B Heard

  7. Week 6 Lab Birth Weights in America, Number 2, part b continued Using the NORMDIST function with the point in question, the mean, the standard deviation, and the cumulative value “TRUE” gives the percent of babies under 5.5 lbs. The distribution “fills” from left to right. Not to be used, posted, etc. without my expressed permission. B Heard

  8. Week 6 Lab Birth Weights in America, Number 3, part b We will identify the mean birth weight and standard deviation for the over 42 weeks gestation period for this problem. The mean is 7.65 lbs and the standard deviation is 1.12 lb. Not to be used, posted, etc. without my expressed permission. B Heard

  9. Week 6 Lab Birth Weights in America, Number 3, part b continued Using the NORMINV function with the .9 (left to right) to find the point at which 90% of the values are below and 10% above, the mean, and the standard deviation. The distribution “fills” from left to right. Not to be used, posted, etc. without my expressed permission. B Heard

  10. Week 6 Lab Birth Weights in America, Number 4, part b We will identify the mean birth weight and standard deviation for the 37 to 39 week gestation period for this problem. The mean is 7.33 lbs and the standard deviation is 1.09 lb. Not to be used, posted, etc. without my expressed permission. B Heard

  11. Week 6 Lab Birth Weights in America, Number 4, part b continued Using the NORMDIST function with the points in question, I subtracted the value for 6 from the value for 9. This was .9373 - .1112 which equals our answer .8261 Not to be used, posted, etc. without my expressed permission. B Heard

  12. Week 6 Lab Birth Weights in America, Number 5, part b We will identify the mean birth weight and standard deviation for the 32 to 35 week gestation period for this problem. The mean is 5.73 lbs and the standard deviation is 1.48 lb. Not to be used, posted, etc. without my expressed permission. B Heard

  13. Week 6 Lab Birth Weights in America, Number 5, part b continued Using the NORMDIST function with the point in question, the mean, the standard deviation, and the cumulative value “TRUE” gives the percent of babies under 3.3 lbs. The distribution “fills” from left to right. Not to be used, posted, etc. without my expressed permission. B Heard

  14. Week 6 Lab Part 2………. Not to be used, posted, etc. without my expressed permission. B Heard

  15. Week 6 Lab • Age Distribution in the United States, Page 277 Not to be used, posted, etc. without my expressed permission. B Heard

  16. Week 6 Lab • Age Distribution in the United States, Number 1 The answer for number 1 is given to us. Make sure you see how it was calculated. Not to be used, posted, etc. without my expressed permission. B Heard

  17. Week 6 Lab • Age Distribution in the United States, Number 2 You will be finding the mean or average for the sample means in number 2. Use the Sample Means given in the lab’s Excel file. Not to be used, posted, etc. without my expressed permission. B Heard

  18. Week 6 Lab • Age Distribution in the United States, Number 3 Does this look like a “Bell-Shaped” curve to you? Not to be used, posted, etc. without my expressed permission. B Heard

  19. Week 6 Lab • Age Distribution in the United States, Number 4 On this one, use your same approach to creating a histogram that you did in a previous lab. You will use the sample data, set up your classes, find the frequencies, then create your histogram. Does it look like a normal curve????? Not to be used, posted, etc. without my expressed permission. B Heard

  20. Week 6 Lab • Age Distribution in the United States, Number 5 The answer for number 5 is given to us. Make sure you see how it was calculated. Not to be used, posted, etc. without my expressed permission. B Heard

  21. Week 6 Lab • Age Distribution in the United States, Number 6 You will be finding the standard deviation for the sample means in number 2. Use the Sample Means given in the lab’s Excel file and compare to the Central Limit Theorem in your book. What does the Central Limit Theorem say? Discuss how it applies here. Not to be used, posted, etc. without my expressed permission. B Heard

  22. Week 6 Lab Part 3………. Not to be used, posted, etc. without my expressed permission. B Heard

  23. Week 6 Lab • Finding z and t scores, Part 3 Not to be used, posted, etc. without my expressed permission. B Heard

  24. Week 6 Lab • Finding z and t scores, Number 1b Just input your value under Confidence level and the z-score is calculated for you! Make sure you look at the formula. Not to be used, posted, etc. without my expressed permission. B Heard

  25. Week 6 Lab • Finding z and t scores, Number 2b Just input your value under Confidence level and sample size and the t-score is calculated for you! Make sure you look at the formula. Not to be used, posted, etc. without my expressed permission. B Heard

  26. Week 6 Lab Part 4………. Not to be used, posted, etc. without my expressed permission. B Heard

  27. Week 6 Lab • Bob’s Candies (Using Confidence Intervals…), Part 4 Not to be used, posted, etc. without my expressed permission. B Heard

  28. Week 6 Lab • Bob’s Candies, Number 1 Use the “average” function and the “stdev” function in Excel to find the sample mean and sample standard deviation. Not to be used, posted, etc. without my expressed permission. B Heard

  29. Week 6 Lab • Bob’s Candies, Number 2 In answering this question, take a look at the sample size! Not to be used, posted, etc. without my expressed permission. B Heard

  30. Week 6 Lab • Bob’s Candies, Number 3 Based on your answer for number 2, choose the appropriate values using the same Excel functions you used in Part 3 of the lab. Not to be used, posted, etc. without my expressed permission. B Heard

  31. Week 6 Lab • Bob’s Candies, Number 4 For 95% you would Use the formula E=Zc*(s/sqrt n), which =1.96*(6.205/6.325)=1.923 Then find your endpoints, the Left endpoint would be x-E=Mean -1.923=______ The Right endpoint would be x+E=Mean +1.923=____ So, you can be 95% confident that the true mean amount the citizens spend per year is between ____and ______. Not to be used, posted, etc. without my expressed permission. B Heard

  32. Week 6 Lab • Bob’s Candies, Number 5 On this one I would take a look at say the 99% lower limit (left hand limit). Discuss this. You would do this the same way you did the previous question (Number 4). Not to be used, posted, etc. without my expressed permission. B Heard

  33. Week 6 Lab • Bob’s Candies, Number 6 On this question, compare Bob’s results (his data) to the national average ($75 per person). Not to be used, posted, etc. without my expressed permission. B Heard

  34. Week 3 Quiz S STAT CAVE See you next week: “Same Stat Time, Same Stat Channel” Not to be used, posted, etc. without my expressed permission. B Heard

  35. I will post charts at: 4stats.wordpress.com

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