For many years the standard for the mean welght of a newborn African Elephant ha
ID: 3318195 • Letter: F
Question
For many years the standard for the mean welght of a newborn African Elephant has been thought to be 200 pounds. Elephant weights are normally dstributed. Has the average weight increased due to global warming? That is the were as follows question. Tanya Nap, the elephant ranger in Kruger National Park, randomly selected 15 newborn African elephants and weighed them. The weights in 187, 251, 242·241,183, 187, 194, 280. 238, 191, 251, 229, 275, 178, 249 ) mean newborn African elephant weight be u with a true (unknown) standard deviation of o. We want to see it u 200 then Tanya will get a huge award for finding something good about global warming. This award should be well deserved (not just lucky) so we do not want to reject Hy unless we are pretty sure that > 200. Let x the sample mean and s - the sample standard deviation. wo want to test at the 3% level a) What should the afternative hypothesis, Ha, be H200 Hoe 200 O Ha: 200 b) what is the formula for your test statistic? .299 15 200Explanation / Answer
a) A option
b) A option
c) Sample mean = 225.07
SD = 35.01
t = (225.07 - 200)/35.01/15
t = 2.77
d) critical = 2.046
e) A option
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