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A researcher is testing the effects of plant food on plant growth. Nine plants have been given the plant food. Another nine plants have not been...

4. A researcher is testing the effects of plant food on plant growth. Nine plants have been

given the plant food. Another nine plants have not been given the plant food. The heights of

the plants are recorded after eight weeks. The populations have normal distributions. The

following table is the result. The researcher thinks the food makes the plants grow taller.

Plant

Group

Sample Mean Height of Plants

(inches)

Population Standard

Deviation

Food 16 2.5

No food 14 1.5

a. State the null hypothesis, H0, and the alternative hypothesis. Ha, in terms of the

appropriate parameter.

Ho: ____________________ Ha: ____________________

b. What is the standardized test statistic value?

______________________

c. What is the p‐value?

______________________

d. What is the decision?

______________________

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Solutions_Z test for Diff Means_CorporalStarHerring5997.doc

4. A researcher is testing the effects of plant food on plant growth. Nine plants have been given
the plant food. Another nine plants have not been given the plant food. The heights of the plants...

Sign up to view the full answer

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