Scope of Inference

Question 1

When is it appropriate to make inferences about a population based upon data collected from a sample?

Revolt · Accepted Answer

A: when the sample is selected at random from the population of interest

Question 2

When the students select their random samples and plot the results on a dotplot, which of the following should they expect to see?The dots, which represent the sample proportions obtained by the students,

Revolt · Accepted Answer

D: will be centered around p, the true population proportion.

Question 3

If the students were to increase the sample size to n = 200 pieces of marbles each, what will the effect be on the center and variability of the sampling distribution?

Revolt · Accepted Answer

B: The center would remain about the same. The variability would decrease.

Question 4

The manager of the marbles store wants to increase the precision of the estimate of the true mean dollar amount of all purchases made by customers at his store that day.Which sample size will give the manager the greatest precision of the estimate of the true mean dollar amount of all purchases made by customers at his store that day?

Revolt · Accepted Answer

D: 50

Question 5

When are the results of an experiment said to be statistically significant?

Revolt · Accepted Answer

D: when the observed results of a study are too unusual to be explained by chance alone

Question 6

Mrs. Miller claims that 10% of the marbles in the jar are purple. Do the students have statistically significant evidence that the true proportion of purple marbles in the jar is greater than 10%? Use the sampling distribution to help answer the question.

Revolt · Accepted Answer

C: Yes, = 0.22 or greater only occurred in 1% of samples in the simulation. Because this is less than 5%, they have statistically significant evidence that the true proportion of purple marbles in the jar is greater than 10%.

Question 7

For which of these studies can we draw conclusions of cause and effect?

Revolt · Accepted Answer

C: C

Question 8

The valid conclusion is .

Revolt · Accepted Answer

B: B only

Scope of Inference Answers

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