A telecommunications company asserts that, according to a study they conducted, patients who have access to more cable channels during recovery from surgery are discharged sooner than those who receive only basic cable in their hospital rooms. Which of the following demonstrates clinical significance of the study?
Patients with more cable channels were discharged an average of one-half day sooner than those with fewer channels
The study used a sample size of 12
Patients with fewer cable channels requested additional nursing support an average of 3 times more during their recovery.
Patients with more cable channels tended to prefer nature and arts channels over history or news and current affairs channels
After completing the power analysis, the researchers determine they need a sample size of 400 to have adequate power in their study. After enrolling subjects, they have a lower response rate than anticipated and they only enroll 320. Inadequate enrollment may increase the risk of:
A type II error
A type I error
Researchers study the relationship between interpersonal violence and health in college age women. The researchers examined the average score on a psychological distress scale and compared the score for abused versus non-abused women. If the researchers report a statistically significant difference and areÂ Â incorrectÂ about this conclusion what type of error could it be?
A type I error
A type II error
A clinical error
An error of omission
Researchers studied the relationship between Vitamin B12 consumption and hair growth and report a p value of 0.56. The study was a pilot study with an alpha of 0.10. You know this means:
There is no statistically significant relationship between Vitamin B12 consumption and hair growth.
Vitamin B12 consumption is association with a 56% increase in hair growth.
The sample size was too small and a type I error was made
There is a statistically significant relationship between Vitamin B12 consumption and hair growth.
Researchers study the relationship between interpersonal violence and health in college age women. They selected an alpha of 0.05. The researchers examined the average score on a psychological distress scale and compared the score for abused versus non-abused women. A p value of 0.016 is reported. Based on this information, you know:
There is a statistically significant difference in the average psychological distress score
This is a clinically significant result
There is no significant difference in the average psychological distress score.
In this study women who were abused were statistically more likely to report psychological distress.
A study reports that administering vancomycin incorrectly is associated with red man syndrome. You know this means:
The p value is less than alpha
A type I error was made in administering the medication
The p value was larger than the alpha
The null hypothesis was accepted
The probability of rejecting the null hypothesis given that it is true describes the:
What does aÂ Â Z-score of 2.5 indicate?
The observation is 2.5 standard deviations above the mean.
The p-value is closer to 0 than 1
The test results do not conform to a normal distribution.
The alpha level is 0.025
How is the actual effect size in a population usually determined?
It must be estimated based on the best literature available.
Multiply the projected effect size by the standard deviation in the control group
Divide the difference between the mean in the experimental group and the mean in the control group by the standard deviation of the experimental group
It is estimated based on the anticipated effect size relative to power.
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