Answer: The 95% confidence interval is approximately (55.57, 58.43)
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Explanation:
At 95% confidence, the z critical value is about z = 1.960 which you find using a table or a calculator.
The sample size is n = 17
The sample mean is xbar = 57
The population standard deviation is sigma = 3
The lower bound of the confidence interval is
L = xbar - z*sigma/sqrt(n)
L = 57 - 1.960*3/sqrt(17)
L = 55.5738905247863
L = 55.57
The upper bound is
U = xbar + z*sigma/sqrt(n)
U = 57 + 1.960*3/sqrt(17)
U = 58.4261094752137
U = 58.43
Therefore the confidence interval (L, U) turns into (55.57, 58.43) which is approximate.
The difference is the highest point minus the beginning elevation. Thus 14-(-2)=14+2=16 feet.
The experimental probability that
Alexander wins a tennis match is 0.21.
If he plays 40 tennis matches in the next week, about how many matches can
Alexander expect to lose?
Is it 32 matches? i got this from google
7/1 I think because it’s 7 times more
