Is -3 bigger or less then -12
2 answers:
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Answer:
a) 0.8505
b) 0.1241
c) 0.2736
d) 0.1495
Step-by-step explanation:
Answer:
a) (76.21,83.79)
b) (77.32,82.68)
c) Interval decreases
Step-by-step explanation:
We are given the following information in the question:
Sample size, n = 60
Sample mean = 80
Sample standard Deviation, s = 15
a) 95% Confidence interval:
Putting the values, we get,
b) Sample size, n = 120
95% Confidence interval:
c) As observed increasing the sample size, the confidence interval become smaller.