Scope of Inference — Quiz

Question 1

Using this dotplot and the difference in proportions from the samples, is there convincing evidence that the new additive was more effective?

Revolt · Accepted Answer

No, because a difference in proportions of 0 point 2 or more occurred 41 out of 200 times, meaning the difference is not statistically significant and the new additive is not more effective.

Question 2

Using the dotplot and the difference in mean distances from the samples, is there convincing evidence that the new golf ball travels farther than the original golf ball?

Revolt · Accepted Answer

Yes, because a difference in mean distances of 4 point 9 feet or more occurred only 6 out of 200 times, meaning the difference is statistically significant and there is convincing evidence the new golf ball travels farther than the original golf ball.

Question 3

Which of the following is a valid conclusion?

Revolt · Accepted Answer

It can be concluded that the new additive caused the extended life of the cut flowers, and this inference can only be applied to the carnations from the greenhouse.

Question 4

Using the dotplot and sample proportion, is there convincing evidence that the teacher’s claim is false?

Revolt · Accepted Answer

No, because a proportion of 0 point 4 5 or less occurred 16 out of 100 times, the sample proportion of red marbles is not statistically significant and there is not convincing evidence that the teacher’s claim is false.

Question 5

Using the dotplot and the difference in mean ratings from the samples, is there convincing evidence that the one detergent is better than the other?

Revolt · Accepted Answer

Yes, because a difference in mean rating of negative 2 point 3 or less occurred only 5 out of 200 times, meaning the difference is statistically significant, and there is convincing evidence that cap b is more effective than cap A .

Question 6

In an activity, students are pulling marbles from a large jar containing blue and red marbles. In their sample, students will calculate the proportion of red marbles. Which of the following sample sizes will have the smallest sampling variability?

Revolt · Accepted Answer

40

Question 7

Using the dotplot and the proportion of winners in the store owner’s sample, is there convincing evidence that the manufacturer’s claim is wrong?

Revolt · Accepted Answer

No, because a proportion of 0 point 4 or more occurred 25 out of 100 times, the sample proportion of winners is not statistically significant and there is not convincing evidence that the manufacturer’s claim is false.

Question 8

Using the dotplot and sample proportion, is there convincing evidence that the teacher’s claim is false?

Revolt · Accepted Answer

Yes, because a proportion of 0 point 4 0 or less occurred only 2 out of 100 times, the sample proportion of red marbles is statistically significant and there is convincing evidence that the teacher’s claim is false.

Question 9

Using the dotplot and the sample mean mileage, is there convincing evidence that the new type of tread improves the mileage?

Revolt · Accepted Answer

Yes, because a mean mileage of 52,000 or more occurred only 7 out of 200 times, the mean mileage is statistically significant. There is convincing evidence the new type of tire tread improves mileage of the tire.

Question 10

Using the dotplot and the proportion of winners in Jack’s sample, is there convincing evidence that the manufacturer’s claim is wrong?

Revolt · Accepted Answer

Yes; because a proportion of 0 occurred 3 out of 100 times, the sample proportion of winners is statistically significant and there is convincing evidence that the manufacturer’s claim is false.

Scope of Inference — Quiz Answers

More from this Course

TRY EDGENUITY HACKS