A study on ovarian cancer observed the following pattern for the relationship between histologic type and race among participants (see table below). The authors concluded that Asian women “had a higher incidence density rate of mucinous tumors” than did white women. Have the authors made an accurate conclusion? Types of tumor Race Mucinous Other Total White 33 (13%) 225 (87%) 258 (100%) Asian 55 (27%) 151 (73%) 206 (100%) Group of answer choices 1. No, it is not accurate to conclude a higher incidence density rate of mucoinous tumors in Asian women without considering “other” tumors 2. No, the table does not give enough information to know if these are new cases or the number of persons at risk which is necessary to make a statement about incidence density rates 3.Yes, the incidence density rate of Mucinous tumors was 27% in Asian women compared to 13% in white women 4. No, the total number of tumors of was 258 in white women and only 206 in Asian women
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
A study on ovarian cancer observed the following pattern for the relationship between histologic type and race among participants (see table below). The authors concluded that Asian women “had a higher incidence density rate of mucinous tumors” than did white women. Have the authors made an accurate conclusion?
|
|
Types of tumor |
|
|
|
Race |
Mucinous |
Other |
Total |
|
White |
33 (13%) |
225 (87%) |
258 (100%) |
|
Asian |
55 (27%) |
151 (73%) |
206 (100%) |
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