A simple smell test could help clinicians detect Alzheimer\'s disease early, sug

Question

A simple smell test could help clinicians detect Alzheimer's disease early, suggests research in Neurology. Researchers studied 274 people (average age 63) at increased risk of developing Alzheimer's disease because they had a parent with the disease. The participants completed scratch-and-sniff tests to identify scents such as lemon, gasoline and bubble gum. Participants who had the most trouble identifying the scents also had higher levels of the Alzheimer's disease biomarkers tau and beta amyloid in their cerebrospinal fluid.

(a) Identify both variables and describe how each was operationally defined.

(b) Identify the direction of the correlation.

(c) Write a full sentence describing the specific claim the researcher can make about the variables.

2. One of these correlations includes a moderating variable. Which study is it and what is the moderating variable?

Explanation / Answer

a) Independent variable: scent identfication percentage

Dependent variable: level of the Alzheimer's disease

b) The correlation is negatively directed as increase in scent identfication percentage reduces level of the Alzheimer's disease and vice versa

Also it studies effect on people aged 63 whose parent had Alzheimer's disease

c)Specific claim can be written as those who have low sensitivity to identify scent are more prone to Alzheimer's disease

2.

A moderator variable, commonly denoted as just M, is a third variable that affects the strength of the relationship between a dependent and independent variable.

In correlation, a moderator is a third variable that affects the correlation of two variables. In a causal relationship, if x is the predictor variable and y is an outcome variable, then z is the moderator variable that affects the casual relationship of x and y.

Age can be considered as moderating variable

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