Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN: 9780079039897
Author: Carter
Publisher: McGraw Hill
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A ecologist wishes to estimate the mean lifespan for a specific species of bird. Assume that bird lifespan is normally distributed
and that each bird's lifespan is independent of all others. The researcher analyzes a random sample of n=7 deceased birds
to find out how long they lived for. It is found that the mean lifespan in the sample is y= 5 4 years with standard deviation
s=13 years. Choose the correct formula for a 95% confidence interval for the true mean lifespan.
X± to.975,n
O xt to.975,n-1
n-1
O none of these
X+ Z0.975
O x+ to.975,n-1'
O xt to.975,n-15
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Transcribed Image Text:A ecologist wishes to estimate the mean lifespan for a specific species of bird. Assume that bird lifespan is normally distributed and that each bird's lifespan is independent of all others. The researcher analyzes a random sample of n=7 deceased birds to find out how long they lived for. It is found that the mean lifespan in the sample is y= 5 4 years with standard deviation s=13 years. Choose the correct formula for a 95% confidence interval for the true mean lifespan. X± to.975,n O xt to.975,n-1 n-1 O none of these X+ Z0.975 O x+ to.975,n-1' O xt to.975,n-15
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