Scope of Inference

Question 1

In a large ball pit, 20% of the balls are red. You plan to jump in and randomly select 10 balls.Which statement is true?

Revolt · Accepted Answer

B: You will likely have one to three red balls in your sample.

Question 2

When sampling, which of the following sample sizes will yield the smallest variability in results obtained from repeated sampling from the population?

Revolt · Accepted Answer

D: 35

Question 3

Tessa conducts an experiment and obtains results that are statistically significant. What is meant by "statistically significant”?

Revolt · Accepted Answer

B: It means that the results that Tessa obtained are too unusual to be explained by chance alone.

Question 4

Is the sample mean time until blinking (x̄ = 36 seconds) statistically significant evidence that the true mean time that students can go without blinking is greater than 30 seconds? Use the results to answer the question.

Revolt · Accepted Answer

. In this case, of the simulated sample means are , which is .: Yes; . In this case, of the simulated sample means are , which is .: 3 percent; . In this case, of the simulated sample means are , which is .: 36 or more; . In this case, of the simulated sample means are , which is .: less than 5 percent

Question 5

Is the sample mean time until blinking (x̄ = 36 seconds) statistically significant evidence that the true mean time that students can go without blinking is greater than 30 seconds? Use the results to answer the question.

Revolt · Accepted Answer

A: ✔ Yes

Question 6

1.5 percent✔ 3 percent5 percent6 percent

Revolt · Accepted Answer

B: ✔ 3 percent

Question 7

✔ 36 or moreequal to 3630 or moreequal to 30

Revolt · Accepted Answer

A: ✔ 36 or more

Question 8

greater than 5 percent✔ less than 5 percent

Revolt · Accepted Answer

B: ✔ less than 5 percent

Question 9

Using technology, the student simulated the sample percent of seniors that turned in their survey using 50 random samples of 10 students under the assumption that 20% of all seniors turned in their survey. Here are the results.

Revolt · Accepted Answer

. In this case, of the simulated sample means are , which is .: Yes; . In this case, of the simulated sample means are , which is .: 0 percent; . In this case, of the simulated sample means are , which is .: 60 percent or more; . In this case, of the simulated sample means are , which is .: less than 5 percent

Question 10

A onlyB onlyBoth A and BNeither A nor B

Revolt · Accepted Answer

C: Both A and B

Scope of Inference Answers

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