A botanist wishes to test the null hypothesis that the average diameter of the flowers of a particular plant is 9.6cm. He decides to take a random sample of size n=80 and accept the null hypottesis if the mean of the sample falls between 9.3 cm to 9.9cm: if the mean of this sample falls outside this interval, he will reject the null hypothesis. What decision will he make and will it be in error if
a) he gets a sample mean of 10.2 cm amd Mu=9.6cm:
b)he gets a sample mean of 10.2 cm and Mu=9.8cm:
c)he gets a sample mean of 9.2 cm and Mu=9.6cm:
d)he gets a sample mean of 9.2 cm and Mu=9.8cm?