#### What decision would you expect the researchers to make with respect to the null hypothesis?

Intravenous administration sets.

QUESTION 1

Locate, and give the reference for, one article that represents the highest evidence available relating to the changing of intravenous administration sets.

According to the JBI evidence hierarchy what level of evidence is this article?

c) What is the evidence regarding the frequency of administration set changes?

QUESTION 2

a) Identify the appropriate measurement scale for the following:

You construct a survey and create categories for age – what scale is this?Identify one advantage and one disadvantage of measuring the variable in this way.

QUESTION 3

The lifespan of light bulbs is normally distributed, with a mean life of 850 hours, and a standard deviation of 20 hours.

What would be the expected lifespan of approximately 99% of the light bulbs?

b) What percentage of light bulbs should last for at least 830 hours?

QUESTION 4

Nursing staff in a surgical ward are interested in acupressure in treating postoperative nausea and vomiting. They decide to carry out a study comparing its effectiveness with that of standard treatment. Patients must consent to the study to be included.

Explain the difference between internal and external validity in studies such as this

Identify 3 threats to internal validity in this study and suggest strategies by which they could be prevented or reduced

QUESTION 5

A class of 30 students received the following marks (expressed as percentages) for their overall assessment.

a) Calculate

i) The mean

ii) The median

iii) The mode

You wish to know whether there is a difference between the marks obtained by male and female students. How would you examine the association between these two variables?

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