QUESTION 14

1. A gardener wants to know whether adding used coffee grounds to her soil will affect the productivity of her tomato plants. Because she has kept meticulous records over the many years that she has been growing tomatoes, she knows that she harvests an average of 25.6 tomatoes per plant with a population standard deviation of 3.8 tomatoes. She adds coffee grounds to the soil and plants 15 tomato plants. At the end of the season, she calculates that she has harvested 27.8 tomatoes per plant.

QUESTIONS 15-24 apply to this scenario

QUESTION 15

1. State the Null Hypothesis

QUESTION 16

1. State the Alternative Hypothesis

QUESTION 17

1. Using a 0.05 level of significance, what is the critical z value? _______

QUESTION 18

1. Using a 0.05 level of significance, what is the calculated test statistic (z)? _______

QUESTION 19

1. Please upload you work for the previous question (Q 17 & 18)
2. Attach File

QUESTION 20

1. At a 0.05 level of significance, based on your calculation, do we accept or reject the null?

QUESTION 21

1. If using a 0.01 level of significance, what is the new critical z value? _______

QUESTION 22

1. At a 0.01 level of significance, based on your calculation, do we accept or reject the null?

QUESTION 23

1. If she had planted a larger sample of tomato plants (n=25) and found the same mean, what would have been the new calculated test statistic (z)? ______

QUESTION 24

1. And at a 0.01 level of significance, with the larger sample size, do we accept or reject the null?