In a plant nursery, the owner thinks that the lengths of seedlings in a box sprayed with a new kind of fertilizer has an average height of 26 cm after three days and a standard deviation of 10 cm. One...

Extracted text: In a plant nursery, the owner thinks that the lengths of seedlings in a box sprayed with a new kind of fertilizer has an average height of 26 cm after three days and a standard deviation of 10 cm. One researcher randomly selected 80 such seedlings and calculated mean height to be 20 cm and the standard deviation was 10 cm. Will you conduct a one-tailed test or a two-tailed test using a = 0.05? Steps Answer 1. Formulate the null and alternative hypothesis. 2. Collect data and decide on appropriate statistical testing procedure. Specify the level of significance a. 3. Compute the test-statistic 4. Determine the rejection region, then make a decision. 5. Make a conclusion about the hypotheses