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Q1) In random sample of 46 bolts, mean length was 1.28 inches and standard deviation was 0.07 inch. Use normal distribution or a t- distribution to create a 99% confidence interval for the mean.
Which distribution must be used to create the 99% confidence interval ?
a) Use normal distribution as the lengths are normally distributed and σ is known.
b) Use t-distribution because n≥ 30.
c) Use t- distribution as lengths are normally distributed and σ is known
d) Use normal distribution because n≥ 30.
e) 99% confidence interval is?
Q2) Using given data table, determine class interval for the wage table?
Hourly Wages
# Employees
$4 to $8
20
$8 to $12
40
$12 to $16
15
$16 to $20
5
a) $4
b) $10
c) $14
d) $20
Q3) Using given data table, find out midpoint for class with greatest frequency?
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