One kind of plant has only blue flowers and white flowers. According to a genetic model, the offsprings of a certain cross have a 60% chance to be blue-flowering, and a 40% chance to be white-flowering independently of one another. One hundred seeds of such a cross are raised, and 68 turn out to be blue-flowering. Use = 5% to test the following hypotheses: H0: = 60% vs. Ha: 60%

Note that is the population percentage of getting blue-flowering,

1) Find the observed Z-value. 2) Find P-value of the test. 3) Give a clear conclusion.