HLT 362 Week 3

Assignments

Module 3 Exercise 31

What are the two groups whose results are reflected by the t ratios in Tables 2 and 3?

Which t ratio in Table 2 represents the greatest relative or standardized difference between the pretest and 3 months outcomes? Is this t ratio statistically significant? Provide a rationale for your answer.

Which t ratio listed in Table 3 represents the smallest relative difference between the pretest and 3 months? Is this t ratio statistically significant? What does this result mean?

What are the assumptions for conducting a t-test for dependent groups in a study? Which of these assumptions do you think were met by this study?

Compare the 3 months and 6 months t ratios for the variable Exercise from Table 3. What is your conclusion about the long-term effect of the health-promotion intervention on Exercise in this study?

What is the smallest, significant t ratio listed in Table 2? Provide a rationale for your answer.

Why are the larger t ratios more likely to be statistically significant?

Did the health-promotion program have a statistically significant effect on Systolic blood pressure (BP) in this study? Provide a rationale for your answer.

Examine the means and standard deviations for Systolic BP at pretest, 3 months (completion of the treatment), and 6 months. What do these results indicate? Are these results clinically important? Provide a rationale for your answer.

Is this study design strong or weak? Provide a rationale for your answer.

Would you, as a health care provider, implement this intervention at your facility based on the Total Risk Score results? Provide a rationale for your answer.

Module 3 Hypothesis Excel Worksheet

There were two independent groups of students who took a school course by different modes. The first sample of students took the course in the online mode and the second sample took the course in the conventional face-to-face mode. Using the sample data, determine if there is a significant difference in the scores between the two groups.

SE[M1-M2]

t-score

Are the two sample means sufficient to conclude that the educational modes are significantly different? Give reasons for your decision.

Module 3 InteliBoard Assessment

The mean of the sampling distribution is equal to

The standard error of the sampling distribution when we know the population standard deviation is equal to

The standard error of the sampling distribution when we do not know the population standard deviation is equal to

When the population standard deviation is known, the sampling distribution is a

When the population standard deviation is not known, the sampling distribution is a

If the size of the sample is increased the standard error

Independent samples are

Dependent samples are

The usual sampling distribution of the difference between means is a

Two samples are dependent if the members of one sample

For the following data, calculate the sampling distribution parameters

For the following data, calculate the sampling distribution parameters

For the following data, calculate the difference between the means distribution parameters

Discussion Questions

Suppose you hear an �old-timer� say, �Why, in my day, kids were much more respectful and didn�t cause as much trouble as they do nowadays!� Formulate a hypothesis related to this statement that you could test. How would you test it?

Researchers routinely choose an ?-level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower ? -level (e.g. 0.01)? What are some situations in which you might accept a higher level (e.g. 0.1)?