Suppose that you wish to test a researcher's claim that the mean height in meters of a normally distributed population of rosebushes at a nursery has increased from its commonly accepted value of 1.60. To carry out this test, you obtain a random sample of size 150 from this population. This sample yields a mean of 1.80 and a standard deviation of 1.30.
What are the appropriate null and alternative hypotheses? Is this a one-tailed or two-tailed test?