I told my boffin daughter that STW has all the answers, can anyone help me win the internetz? 🙂
An excavation of an early Upper Paleolithic cave site in France gave two samples of hominid skeletons: a sample of Homo Sapiens Sapiens (n1 = 20) and a sample of Homo Sapiens Neandertalis (n2 = 20).
We are interested in establishing whether there is any significant difference between the cranial capacities of these two hominid species from this cave site.
Let X1 = 1514.6 the sample mean of cranial capacities (cm3) for the Homo Sapiens Sapiens specimens, and X2 = 1553.4 for the Homo Sapiens Neadnertalis.
Also, the sample standard deviation is s1 = 78.4 for the first and .s2 = 74.7 for the second group, respectively.
Q.
If one rejected the null hypothesis when the absolute difference of the two is 45cm³ what is the probability of a type 1 error?
She’s been working at this for 5 hours apparently, and neither her or her friends have any idea.