Assignment: T-test Limit Confidence Level

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Assignment: T-test Limit Confidence Level

Assignment: T-test Limit Confidence Level

Assignment: T-test Limit Confidence Level

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Assignment: T-test Limit Confidence Level
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NR714 Week 7 Module 3 Quiz Latest 2017 November (all correct answers) Question 1 3.25 / 3.25 pts In trying to set an appropriate range of 95% that focuses on the population used to estimate a characteristic of a population where the numbers can be stated with the probability that the population characteristic is included between them, we are setting a t-test limit confidence level population sample Question 2 3.25 / 3.25 pts The term that captures the entire target group of individuals under study is referred to a placebo sample confidence interval population Question 3 3.25 / 3.25 pts You are conducting a research study on the effectiveness of normal saline administered subdermally compared to lidocaine to reduce pain during IV insertion. If subjects getting lidocaine are in the experimental group, the subjects getting the inert normal saline are in the control group preliminary group sample group research group Question 4 3.25 / 3.25 pts The same colleague asks you now to define the sample in research. Which is the most accurate response? “The sample is a subset of the population that the researcher intends to study.” “The sample is a group of individuals used in a pilot study before the actual study is conducted.” “The sample is a small group of study participants who drop out of a research study.” “The sample refers to a partial subject payment paid to study participants at the start of a research study.” Question 5 3.25 / 3.25 pts In the inner city study investigating the impact on air quality on childhood asthma, what is the study sample? “The study sample is a randomly selected subset of all inner city school-aged children in city X.” “The study sample is the entire group of inner city school-aged children in city X.” “The study sample is a small self-selected group of inner city school-aged children diagnosed with asthma.” “The study sample is the group of all inner city school-aged children with asthma and their parents.” Question 6 3.25 / 3.25 pts If a researcher tells you she achieved a narrow interval, in which there is little difference between lower and upper limits. The narrow confidence interval indicates an inaccurate measure of how well the true measure of the parameter is estimated. a satisfactory, but less desirable estimate than a wide interval. a less precise estimate than does a wide interval. a better and more precise estimate than does a wide interval. Question 7 3.25 / 3.25 pts Let’s say that you are conducting a study on pain tolerance among men and women at a rural community hospital. Which of the following statements indicates the null hypothesis for your study? There will be a statistically significant difference in pain tolerance between the two groups. There will be a significantly higher pain tolerance in women than men. There will be no difference in pain tolerance between the two groups. There will be a significantly lower pain tolerance in women than men. Question 8 3.25 / 3.25 pts You are on a research team in a major urban medical center. The team is proposing to conduct a research study on investigating the effectiveness of a new beta blocker medication to treat hypertension. The study will have two groups of subjects. One group will range in age from 40-65 years, while the second group will range in age from 65-80 years. You already know that a t-test will be performed to determine differences between the two groups related to decrease in hypertension as a result of taking the new beta blocker. What statement represents the best rationale for performing a t-test? It does not matter what the difference in blood pressure is between the younger and older groups. It is important to know the differences in blood pressure between the two groups to determine effectiveness of the beta blocker in younger and older persons. It is not necessary to perform the t-test because we already know the two groups are different. It is important to perform the t-test because it will confirm that the beta blockers are more effective in the older group. Question 9 3.25 / 3.25 pts Let’s say in the previous beta blocker study, the t-test determined that the average or mean blood pressures for each group were as follows. The younger group had a 20% decrease in blood pressure by using the beta blocker. The older group had a 50% decrease in blood pressure. What might these results be telling us? Select all that apply. Correct! The beta blockers were shown to be more effective in the older adults than younger adults. The beta blockers were effective in both younger and older adults. The beta blockers were not effective in either younger or older adults. While the beta blockers were shown to be effective in both groups, they were more effective in the older adult group. Question 10 3.25 / 3.25 pts You are reading a research article about the effectiveness of exercise on lowering cholesterol. The study used two groups, where one group was given an exercise regime, while the other group avoided exercise. What is the null hypothesis for this study? There will be a statistically significant difference between the exercise and the sedentary groups. There will be no statistically significant difference between the exercise and the sedentary groups. There will be a statistically significant decrease in cholesterol in the sedentary group. There will be a statistically significant decrease in cholesterol in the exercise group.

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