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Q1) A business wishes to evaluate true mean annual income of its customers. It randomly samples 200 of its customers. Mean annual income was= $52,500 with standard deviation of $1,800. Determine a 95% confidence interval for true mean annual income of business' customers.
Q2) In standard normal distribution mean is always ___
a) None of these
b) 1
c) 2
d) 0
Q3) Area under standard normal curve is
b)1
c) 0
d) 2
Q4) What is critical z-value which corresponds to confidence level of 88%
a) Approximately1.75
b) Approximately1.55
c) Approximately1.48
d)Approximately2.11
Q5) Interpret 95% confidence interval of (3.355, 3.445) for population mean.
Q6) In normal distribution with mu = 25 and sigma = 3 what number corresponds to z = -3?
A) 20
B) 16
C) 18
D) None of these
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