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

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

Question 2

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 3

1.5 percent✔ 3 percent5 percent6 percent

Revolt · Accepted Answer

✔ 3 percent

Question 4

✔ 36 or moreequal to 3630 or moreequal to 30

Revolt · Accepted Answer

✔ 36 or more

Question 5

greater than 5 percent✔ less than 5 percent

Revolt · Accepted Answer

✔ less than 5 percent

Question 6

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 7

A onlyB onlyBoth A and BNeither A nor B

Revolt · Accepted Answer

Both A and B

Question 8

✔ A onlyB onlyBoth A and BNeither A nor B

Revolt · Accepted Answer

✔ A only

Question 9

A onlyB onlyBoth A and BNeither A nor B

Revolt · Accepted Answer

B only

Question 10

A onlyB onlyBoth A and B✔ Neither A nor B

Revolt · Accepted Answer

✔ Neither A nor B

Scope of Inference Answers

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