Exam 3: Descriptive Statistics, Probability, and Measures of Central Tendency

You have collected data about the average response time of participants in your study. You are delighted to find that the variable is normally distributed. More than half your respondents take longer than 16 seconds to respond and one third take less than 12 seconds to respond. What is the median response time of your participants?

Patients on your unit complete a functional mobility test. The test determines how many seconds it takes to walk 20 feet unassisted. Your patient's speed is reported as a Z score of 2.3. You would expect your patient to walk 20 feet unassisted:

You have collected data about the average response time of participants in your study. You are delighted to find that the variable is normally distributed. The mean response time is 30 seconds and the standard deviation is 4 seconds what percent of your subjects would you expect to respond in 26-34 seconds?

A researcher collects demographic data on the marital status of the study subjects. The variable is measured as married/not married. What would be the most appropriate measure of central tendency?

You have collected data about the post void residuals (PVR) of participants in your study. The mean PVR is 120 mls. Because you have some outliers noted in your study you also report a median PVR which is 138 mls. Based on this data you know:

A researcher collects demographic data on the marital status of the study subjects. The variable is measured as married/divorced/separated/widowed/never married/cohabitating. What would be the most appropriate measure of central tendency?

You have collected data about the average age of participants in your study. You are delighted to find that the variable is normally distributed. If the mean age is 12 years and the standard deviation is 4 years. What is the median age for your subjects?

You have collected data about the average response time of participants in your study. You are delighted to find that the variable is normally distributed. More than half your respondents take longer than 16 seconds to respond and one third take less than 12 seconds to respond. What is the median response time of your participants?

A researcher collects demographic data on the marital status of the study subjects. The variable is measured as married <2 years, married 2-9 years, married >9 years. The researcher reports that the most frequent response from subjects is married <2 years. What other measure of central tendency would be appropriate to report from this type of variable?

Patients on your unit complete a functional mobility test. The test determines how many seconds it takes to walk 20 feet unassisted. Your patient's speed is reported as a Z score of -0.09. You would expect your patient to walk 20 feet unassisted:

Patients on your unit complete functional mobility tests. Your patient's speed is reported as a Z score of 2.3. Her strength is reported as a Z score of -0.8 You know this means:

Patients on your unit complete a functional mobility test. The test determines how many seconds it takes to walk 20 feet unassisted. Your patient's speed is reported as a Z score of 2.3. Her roommate's speed is reported as a Z score of 1.8. You would expect your patient to walk 20 feet unassisted:

Your unit completes the internal controls module at your workplace. Two of the nurses on your unit were internal control specialists in their last place of employment and scored a perfect score on the exam while the rest of the nurses had an average score of 78 with a range of 72-84 on the test. When you look at the grade distribution you are not surprised to see:

You have collected data about the average response time of participants in your study. You are delighted to find that the variable is normally distributed. If the mean response time is 12 seconds and the standard deviation is 4 seconds what percent of your subjects would you expect to respond in 4-20 seconds?

A researcher collects demographic data on the marital status of the study subjects. The variable is measured as the number of years married on a scale of 0-75. What would be the most appropriate measure of central tendency?

9. You have collected data about the fasting blood glucose (FBG)level of participants in your study. You are delighted to find that the variable is normally distributed. If the mean FBG is 82 and the standard deviation is 2.8 in what range would you expect to find the FBG of 95% of your study participants?

Researchers examined the relationship between interpersonal violence and health in college age women. The researchers administered a psychological distress questionnaire which produced a score on a scale of 0-12. What would be an appropriate measure of central tendency to consider for this variable?

8. You have collected data about the fasting blood glucose (FBG) level of participants in your study. You are delighted to find that the variable is normally distributed. If the mean FBG is 82 and the standard deviation is 2.8 in what range would you expect to find the FBG of 68% of your study participants?

Your subjects complete a pretest to assess their cognitive skills and have a mean score of 62% on the pretest. Then they complete your intervention and a post-test with the following scores: 82%, 79%, 47%, 65%, 81%, 57%, 57%, 52% and 76%. What was the mean on the posttest?

Your subjects complete a pretest to assess their cognitive skills and have a median score of 67% on the pretest. Then they complete your intervention and a post-test with the following scores: 82%, 79%, 47%, 65%, 81%, 57%, 57%, 52% and 66%. What was the median on the posttest?