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 ? = 0.05?
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The null hypothesis is that the average height of the seedlings is 26 cm. The alternative hypothesis is that the average height of the seedlings is not 26 cm. The question is whether the new fertilizer has an effect on the height of the seedlings, either Show more…
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Use the 6 steps method to solve the following: 1. In plan nursery, the owner thinks that the length of seedlings in a box sprayed with a new kind of fertilizer has an average height of 26 cm after three days and standard deviation of 10 cm. One researcher randomly selected 80 such seedlings and calculated the mean height to be 20 cm and the standard deviation was 10 cm. Conduct a one-tailed test. Proceed with the test using 90% confidence level.
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