A school counselor randomly selects a sample of 30 students to investigate the i

Question

A school counselor randomly selects a sample of 30 students to investigate the impact of a behavior intervention on their academic performance. If she increases her sample size to 50 she will ________ the statistical power of her study. A. increase B. decrease C. not impact In general, increasing the alpha level (for example from.01 to.05) will A. increase the likelihood of rejecting the null hypothesis B. decrease the likelihood of rejecting the null hypothesis C. not affect the likelihood of rejecting the null hypothesis A newspaper article claims that the average age for people who receive food stamps is 40 years. You believe that the average age is less than that. You take a random sample of 100 people who receive food stamps, and find their average age to be 39.2 years. You find that the calculated test statistic falls within the rejection zone (assuming a =.05). What would be an appropriate interpretation of this result? A. The statistically significant result indicates that the average age of people who receive food stamps is younger than 40. B. The evidence is not strong enough to support the claim that the average age of people who receive food stamps is younger than 40. C. An error must have been made. This difference is too small to be statistically significant. A directional hypothesis is known as a tailed test.

Explanation / Answer

7. As n inceases, so does the power of the significance test. This is because a larger sample size narrows the distribution of the test statistics.

So answer is Is she inccrease her sample size to 50 so will increase the statistical power of her study.So A is answer

8.  Increasing the significance level reduces the region of acceptance, which makes the hypothesis test more likely to reject the null hypothesis.

In general increasing the alpha level will increase the likelihood of rejecting null hypothesis.So A is answer

9. Here test statistics falls withing the rejection zone. Which means we reject null hyothesis.

Hence The statitistically significant result indicates that the average age of people who receive food stamps is younger than 40. So A is answer.

10. A one-tailed test, also known as a directional hypothesis, is a test of significance to determine if there is a relationship between the variables in one direction.

So Answer is A directional hypothesis is known as a one tailed test.

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