3. A sample of 20 plants is given a new fertilizer to increase growth. After a waiting period, their mean height and sta

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3 A Sample Of 20 Plants Is Given A New Fertilizer To Increase Growth After A Waiting Period Their Mean Height And Sta 1 (109.73 KiB) Viewed 92 times

3. A sample of 20 plants is given a new fertilizer to increase growth. After a waiting period, their mean height and standard deviation are computed to be 30.39 and 2.47 inches, respectively. (a) With 95% confidence, what is the average height for all plants in the population? (b) Is there significant evidence that the population mean has increased to 30 or more? Answer with an appropriate hypothesis test. Or, you may use your answer above. (c) What assumption are you making about the population distribution? Is is justified here? A histogram of the data is provided below. Histogram of 3.0 25 20 Frequency 1.5 1.0 T 0.5 1 0.0 70 75 80 85 90 95