Hypothesis testing (two tails test)
a)In one local community the union claimed that electrician earned of $70 000 with a standard deviation of $5000. A recent sample of 130 electricians found that the mean income to be
70 500. At the 0.10 level of significance should we accept the claim and that the mean income is not equal to 70 000?
b) Hypothesis testing small sample -two tails
= 15
n = 13
s = 2
x= 16.1
α = .10