Math 160 Study Guide for Final Exam Exposure to various chemical substances can
ID: 3322961 • Letter: M
Question
Math 160 Study Guide for Final Exam Exposure to various chemical substances can pose substantial health risks. Evidence suggests that a high indoor radon concentration might be linked to the development of childhood cancers The first sample (on the left) consisted of houses in which a child diagnosed with cancer has been residing, Houses in the second sample had no recorded cases of childhood cancer 1. Radon Concentration in two samples 50- 30 20 10 Which of the following statements is correct? A. B. C. D. The mean radon concentration for the first sample (cancer) will be smaller than the median. Approximately 75% of the radon concentrations in the second sample (no cancer) are above 24. The median radon concentration for the first sample (cancer) is smaller than the median for the second sample (no cancer). The IQR for the second sample (no cancer) is larger than for the first sample (cancer). 2. Below are the numbers of text messages sent in one week by the cell phone users on one floor of a college dormitory. 85 111 97 120 121 121 115 120 125 124 127 128 127 135 a. Find the mean, median, and mode of the data set(use technology if appropriate)Explanation / Answer
1:
The first box plot shows that the distribution of cancer sample is skewed to right. So its mean will be greater than median.
First option A is incorrect.
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Third quartile of second box plot (no cancer) is at 24. That is approximately 25% data values are above 24.
Second option B is incorrect.
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Median of second sample is samller than first sample.
Third option C is incorrect.
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Box of second box plot has greater width so second box plot has greater IQR.
Fourth option D is correct.
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2)
Folloiwng is the output of descritpive statistics showing mean, median and mode:
Descriptive statistics X count 14 mean 118.29 sample standard deviation 13.15 sample variance 172.99 minimum 85 maximum 135 range 50 1st quartile 116.25 median 121.00 3rd quartile 126.50 interquartile range 10.25 mode 120.00 low extremes 1 low outliers 1 high outliers 0 high extremes 0