9.3/11.2 Quiz Hypothesis Testing (Differences )

To test the effects of a new fertilizer, 100 plots are treated with the new fertilizer, and 100 plots are treated with the old fertilizer. A computer’s random number generator is used to determine which plots get which fertilizer. the crops are weighed at the end of 6 weeks and mean weights from the two groups are compared.

Which kind of test should be used?

• Paired t-test (Mean Difference)

• 2 Sample t-test (Difference of Means)

• 2 Prop z-test (Difference of Proportions)

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CCSS.HSS.IC.B.4

To test the effect of background music on productivity, fifty factory workers are observed. The number of tasks they complete are tallied. For one month, each subject works without music. For another month, the subject works while listening to music on an MP3 player. The month in which each subject listens to music is determined by a coin toss.

Which kind of test should be used?

• Paired t-test (Mean Difference)

• 2-Sample t-test (Difference of Means)

• 2-Prop z-Test (Difference of Proportions)

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CCSS.HSS.IC.B.3

It is thought that the average penny is older than the average quarter. The average age of a sample of 50 pennies was 8.72 years with a s = 0.73 years and the average age of 50 quarters was 6.78 years with a s = 0.99 years.

• 2 sample t-test (Difference of Means)

• Paired t-test (Mean Difference)

• 2 Prop z-test (Difference of Proportions)

Tags

CCSS.HSS.ID.A.4

A major department store wants to compare the mean number of customers an employee can process per hour using two new scanning systems. 100 employees are randomly selected and then randomly assigned to one of the new systems. After each group of 50 has been trained on one scanning system and 50 on the other, the number of customers processed per hour is recorded. Which test is most appropriate for this situation?

• 2-sample t-test (Difference of Means)

• Paired t-test (Mean Difference)

• 2-prop z-test (Difference of Proportions)

A random sample of 425 citizens of Naboo found that 34% support the Galactic Republic. A sample of 585 citizens of Tatooine found that 38% support the Galactic Republic. What test would you use to assess a difference in support between Naboo and the Galactic Republic?

• 2-sample t-test (Difference of Means)

• Paired t-test (Mean Difference)

• 2-Prop z-test (Difference of Proportions)

• Fail to Reject the Null. There is not enough evidence to support the claim that there are more chips in Keeblers.

• Fail to Reject the Null. There is enough evidence to support the claim that there are more chips in Keeblers.

• Reject the Null. There is enough evidence to support the claim that there are more chips in Keeblers.

• Reject the Null. There is not enough evidence to support the claim that there are more chips in Keeblers.

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CCSS.HSS.IC.B.4

• Females make less per week on average than males.

• Females make more per week on average than males.

• The proportion of females making living wage is less than the proportion of males making living wage.

• The proportion of females making living wage is more than the proportion of males making living wage.

Mathematical Equivalence

ON

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CCSS.HSS.IC.B.4

• None of these.

• Reject the Null. 0 is not in the interval, so it's not plausible that the two proportions are equal.

• Fail to reject the null. 0 is not in the interval, so it's not plausible that the two proportions are equal.

• Fail to reject the null. 0 is in the interval, so it's plausible that the two proportions are equal.

• Reject the Null. 0 is in the interval, so it's plausible that the two proportions are equal.

Tags

CCSS.HSS.IC.B.4