An urban community would like to show that the incidence of breast cancer is higher in their area than in a nearby rural area. (PCB levels were found to be higher in the soil of the urban community.) If it is found that 20 of 200 adult women in the urban community have breast cancer and 10 of 150 adult women in the rural community have breast cancer, can we conclude at the 0.05 level of signicance that breast cancer is more prevalent in the urban community?

Sergio Gonzalez Week 3 STATS 241 Chapter 3 Pt 2 Coefficient of variationmeasures the spread of data relative to the mean of the data used to compare variables with different mean,SD’s, and units Zscoremeasures the number of standard deviations a given data value is away from mean of data set and can be negative Ex: Mean1602 SD5000 value1810 18101602/500= .416 Empirical Ruleused to find the percentage of data within 1,2,or 3 standard deviations of them ● 68% of data in 1 SD of mean ● 95% of data in 2 SD’s of mean ● 99.7% of data in 3 SD’s of mean Percentiledata value that separates the sorted data set so that some percentage of data falls below the data value Ex: 1,1,2,3,3,6,6,6,7,7,