Math1342

 Project 2. TheIQ scores for a random sample of 100 children below.  (Source: Neuropsychological dysfunction in Children with Chronic Low-Level Lead Absorption,” by P.J. Landrigan, R.H. Whitworth, R.W. Baloh, N.W. Staehling, W. F. Barthel, and B. F. Rosenblum, Lancet, Vol. I, Issue 7909)  

70   85  86  76  84  96  94   56  115  97  77  128  99  80 118  86141 88  96  96 107  86  80 107  101  91  125 96  99 99 115  106  105 96  50  99  85  88  120  93  87  98  78  100  105  87  94  8980  111  104  85  94  75  73  76  107  88  89  96  72  97  76  107104  85  76   95  86  89  76  96  101  108  102   77   74   92   82 93  85  75  85  80  101  89  80  94  88  104  88  88  83  104 96  76  80  79  75 140

Use technology to do the following excises.

1. Find the sample mean of the data.

2. Find the sample standard deviation of the data 

3. Find the five-number summary of the data.

4. Make a frequency distribution for the data. Use a class width of 15. 

5. Draw a histogram for the data. Does the distribution appear to be bell-shaped

6. What percent of distribution lies within one standard deviation of the mean? Within two standard deviations of the mean? Within three standard deviations of the mean?