b)
standard errror of mean = | σx=σ/√n= | 90.0000 |
test statistic z = | (xbar-μ)/σx= | -1.744 |
hence p value =0.0409 ( please try 0.0405 if this comes wrong due to rounding error)
c)
No
d)
critical value of test statistic =-1.645
reject if z is less then the critical value
using alpha=0.05 , can you conclude,,,,,,,,,,,,? -No
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