From Case Study Tumors, which of the following statements best expresses the null hypothesis for this experiment. [2 pt; L2; I.A.1]

There is no significant difference in the average tumor mass from the two groups of mice.

There is a significant difference in the average tumor mass from the two groups of mice.

The average tumor mass of Group A mice will be significantly less than that of Group B.

The average tumor mass of Group B mice will be significantly less than that of Group A.

QUESTION 17

From Case Study Tumors, which of the following statements best expresses the alternative hypothesis for this experiment. [2 pt; L2; I.A.1]

The average tumor mass of Group B mice will be significantly less than that of Group A.

The average tumor mass of Group A mice will be significantly less than that of Group B.

There is a significant difference in the average tumor mass from the two groups of mice.

There is no significant difference in the average tumor mass from the two groups of mice.

QUESTION 18

What statistical test is most appropriate for an analysis these data (Case Study _Tumors)? [2 pt; L2; I.A.3]

chi-squared test

t-test, 1-tailed

t-test, 2-tailed

z-score

QUESTION 19

What is the probability of obtaining the numbers posted above under the null hypothesis (Case Study _Tumors)? To receive credit, report the p value correctly rounded to 2 decimal places. [2 pt; L2; I.A.3]

QUESTION 20

Based on the results of the statistical test, do you reject or fail to reject the null hypothesis (Case Study _Tumors)? [2 pt; L2; I.A.3]

fail to reject

reject

2 points

QUESTION 21

Which of the following best expresses the conclusion drawn from Case Study _Tumors? [3 pt; L3; I.A.4]

The drug had no effect on the growth of the tumor.

The drug produces a statistically significant increase in tumor mass.

The drug produces a statistically significant decrease in tumor mass.

The drug does not produce a statistically significant decrease in tumor mass.

A scientist wishes to know if a certain drug inhibits the growth of tumors (ie, decreases tumor mass). She obtained mice with tumors and randomly divided them into two equal groups. Mice in Group A served as the control and did not receive doses of the drug, while mice in Group B received regular doses of the drug. After 2 weeks of treatment, she sacrificed all the mice, resected the tumors and determined the mass of each tumor. The mass of the tumor taken from each mouse is given below. Using Microsoft Excel, perform an appropriate statistical test to evaluate the data and answer questions Mouse Number 1 2 3 4 56700 8 9 10 Mean Tumor Mass (grams) Group A 0.71 0.83 0.89 0.57 0.68 0.74 0.75 0.67 0.80 0.78 0.742 Group B 0.72 0.68 0.69 0.66 0.57 0.66 0.70 0.63 0.71 0.73 0.675