In a hypotheses of H0 : mu = 7 against the alternative Ha : mu < 7 from a normal population with known standard deviation sigma = 1 a sample of size 16 is taken and Z value calculated equals -1.80.
a) What is the p value calculated for this test ?
b) Would the null hypothesis value have been rejected if this was a 5% level test?
c) Would the null hypothesis have been rejected if this was a 1% level test?
d) What was the value of xbar calculated from our sample?