**SPSS Homework: I'll send dataset over private message. You will need to have SPSS software to complete assignment. **

1. In a study of apparently healthy children aged 6 to 60 months in Papua New Guinea, serum retinol was measured in 40 children. The units are micromoles per liter (umol/l).

(a) Look at the data carefully using a histogram or stem-and-leaf plot. Do you think there are outliers or is this a skewed distribution?

(b) Do you think the mean is a good characterization of the center of this distribution? Explain why or why not.

(c) Find a 95% confidence interval for the mean serum retinol. How do you interpret this interval?

(d) Discuss the appropriateness of using this methodology for these data.

(e) Use the web applet at http://lock5stat.com/statkey/ to obtain a nonparametric 95% confidence interval. Compare it to the above one.

2. A study was conducted at a major north eastern American medical centre regarding blood cholesterol levels and heart-attack incidents. A total of 28 heart-attack patients had their cholesterol levels measured two days, 4 days, and 14 days after the attack. In addition, cholesterol levels were recorded for a control group of 30 people who had not had a heart attack. The units of cholesterol measurement are not given in the original reference but are presumably mg/dL of blood. The attached file has data on the 28 heart-attack patients at 2 days and 4 days.

(a) Compute the amount of decreases of day 4 from day 2 and display them in a histogram or stem-and-leaf plot. Do you think there are outliers or is this a skewed distribution?

(b) Do you think the mean is a good characterization of the center of this distribution? Explain why or why not.

(c) Conduct a hypothesis test to determine if the average decrease is significantly greater than zero. What is your conclusion?

(d) Discuss the appropriateness of using this methodology for these data.

(e) Use the web applet at http://lock5stat.com/statkey/ to conduct a nonparametric test.

Compare it to the above one.

**Webassign Homework**

**I need you to complete HW 4 - HW 9 (IT seems like much work but each one is short and easy.)**

***Username and Password Will be Provided in private message**

Subject | Mathematics |

Due By (Pacific Time) | 04/03/2014 12:00 am |

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