Grey-Seal Nursing Grey seals are one of several types of earless seals. The leng
ID: 3135346 • Letter: G
Question
Grey-Seal Nursing Grey seals are one of several types of earless seals. The length of time that a female grey seal nurses her pup is studied by S. Twiss et al. in the article "Variation in Female Grey Seal (Halichoerus grypus) Reproductive Performance Correlates to Proactive-Reactive Behavioural Types" (PLOS ONE7(U): e49598. doi:10.1371/journal.pone.0049598). The average lactation (nursing) period of all earless seals is 23 days. A hypothesis test is to be performed to decide whether the mean lactation period of grey seals differs from 23 days. Now suppose that the results of carrying out the hypothesis test lead to rejection of the null hypothesis. Classify that conclusion by error type or as a correct decision if in fact the mean lactation period of grey seals d. equals 23 days. e. differs from 23 days.Explanation / Answer
a) When the null hypothesis is true that is mean lactation period of grey seals is indeed 23 days and the hypothesis is rejected, reseracher commit sType I error.(Incorrect rejection of true null hypothesis).
b) The reseracher has taken right decision by rejecting null hypothesis.
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