Statistics TEKS Review Quiz

A researcher randomly assigned students to two groups. One group was assigned to watch a violent television program while the other group watched a nonviolent program. The student's behavior was then recorded for incidences of aggressive behavior. Which research method is most appropriate?

• experimental

• census

• sample survey

• observational study

Tags

CCSS.HSS.IC.B.3

Jane Goodall lived among wild chimpanzees intermittently for decades, studying their social and family systems while keeping her interaction with the chimpanzees to a minimum. Which research method is most appropriate?

• biased study

• census

• experiment

• observational study

Tags

CCSS.HSS.IC.B.3

To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group.

Is this an experiment or an observational study?

• Experiment

• Observational study

• Neither

• Both experiment and observational study.

Tags

CCSS.HSS.IC.B.3

A researcher stood at a school parking lot entrance to see if the color of a car is related to the driver not wearing a seat belt.

Which research method is most appropriate?

• Observational Study

• Experiment

• Census

• Correlation

Tags

CCSS.HSS.IC.B.3

Which of the following is the definition of a Type I error?

• The failure to reject a false null hypothesis

• Rejecting a true null hypothesis

• The acceptance to reject a null hypothesis

• Accepting a true null  hypothesis

Which of the following represents the appropriate null & alternative hypotheses?

The mean height of women is greater than 65"

• H₀: μ > 65"

  Hₐ: μ ≠ 65"

• H₀: μ = 65"

  Hₐ: μ > 65"

• H₀: p > 65"

  Hₐ: p ≠ 65"

• H₀: p = 65"

  Hₐ: p > 65"

A researcher claims that the mean cost of a dozen eggs is greater than $5. Suppose the P-value for an associated hypothesis test is 0.0304. Using a = 0.05, what is the properly constructed conclusion?

• There is sufficient evidence to reject the claim that the population mean cost of a dozen eggs is $5 at the 0.05 significance level. Therefore, we can support researcher's claim.

• There is insufficient evidence to reject the claim that the population mean cost of a dozen eggs is $5 at the 0.05 significance level. Therefore, we can support researcher's claim.

• There is sufficient evidence to reject the claim that the population mean cost of a dozen eggs is more than $5 at the 0.05 significance level. Therefore, we can support researcher's claim.

• There is sufficient evidence to reject the claim that the population mean cost of a dozen eggs is more than $5 at the 0.05 significance level. Therefore, we cannot support researcher's claim.

When the p-value is greater than alpha we:

• Reject Ho

• Fail to reject Ha

• Fail to reject Ho

• Reject Ha

If the Confidence level is changed from 99% to 95%, then the margin of error gets larger from the center of the distribution.

• True

• False

Tags

CCSS.HSS.IC.B.4

A fast food outlet claims that the mean waiting time in line is less than 3.5 minutes. A researcher collects random sample of 20 customers to test the fast food outlet's claim. The sample has a mean of 3.7 minutes with a standard deviation of 0.8 minutes. If α = 0.05, which of the following would be the p-value if:

H₀: μ = 3.5

H_a: μ < 3.5

• 1.118

• 0.868

• 0.139

• 0.277