Ch 5, 6, 7 scholarly quiz

One group of children participated in a study. In one condition they wore a weighted vest, and in the other they wore an unweighted vest. The inferential statistic used to compare the differences between the two conditions is

dependent sample t- test

Which of the following difference statistics is an example of a within group comparison

dependent sample t-test

When conducting a t-test, if all other factors are equal, there is more likely to be a statistically signicant difference between groups if

variability is small

Which statistic would be most helpful in determining if the impact that an intervention had on an outcome is large enough that it could be clinically significant?

1.62

A research study reports that the mean = 5.4, 95% CI [3.2, 7.9]. Which

of the following is the best interpretation of the confidence interval?

the population has a mean that falls between 3.2 and 7.9

Which statistic gives you information about the likelihood of making a type II error?

Power

A study comparing conventional treatment and a new intervention finds no interaction effect, but it does find a main effect for time. Which interpretation of the findings is most accurate?

Both groups improved, but one group did not improve more than the other

Adults with traumatic brain injury, schizophrenia, and dementia are

compared on a measure of executive function. Which statistic would be used to determine if there is a difference between the three groups?

One-way ANOVA

In a randomized controlled trial with a pretest and posttest, which

comparison is most important for determining if the intervention

condition is more effective than the control condition?

interaction effect

A study compares the percentage of males and females in an OT class with the percentage of males and females in a PT class. Which statistic would be used to determine if there is a difference?

Chi-square

What type of graph is most useful for illustrating the difference in survival rates for two or more groups?

Kaplan Meir Curve

When the outcome is dichotomous and it occurs in more than 10% of the sample, which statistic is a more accurate estimate?

Risk Ratio

Which value is most often used to represent the unique varance contributed by a variable or set of variables in linear regression?

R2 Change

In a risk ratio, if a predictor variable contributes nothing to determining the outcome, what will the RR equal?

1.0

Multicollinearity means that

many of the predictor variables are inter-correlated

Which of the following is an example of a negative correlation?

fewer hours of sleep relates to more errors on a test

Which of the following statistics is an effect size?

R

Which statistic would you use for examining the relationship between two continuous variables in a cross-sectional study?

Pearson product-moment correlation

Which of the following indicates the strongest relationship

r= -0.8

Confidence intervals are used to explain the expected population values regarding what type of relationship statistic?

OR

Which of the following is the best example of rank-ordered discrete data?

degree of burn

What type of data is needed to calculate sensitivity and specificity outcomes?

dichotomous

What characteristic of an assessment is most important if a therapist is interested in an assessment that will measure changes over time?

responsiveness

The Denver Developmental Screening Test identifies the percentage of children taht are able to perform a certain task. This is an example of which type of test?

Norm-referenced test

A therapist administers a test without any training or practice and ends up with inaccurate results. This is an example of

Method error

You are trying to select the best measure to identify patients ready for discharge. It is most critical that you correctly identify those that are not ready because you don't want to discharge individuals too soon. For this reason, you should select a test with:

good specificity

Two therapists score a test very differently. This suggests that the test has:

Poor inter-rater reliability

A study finds that MCID = 5.75 for the Loewenstein Occupational

Therapy Cognitive Assessment - Geriatric (Li & Lin, 2020). This means:

An improvemnet greater than 5.75 points is clinically meaningful

A new measure of upper extremity function is administered along with the Fugl-Meyer Assessment of Motor Function because the Fugl-Meyer is widely accepted for its psychometric properties. This study will provide evidence to evaluate the new measure's:

concurrent validity

A study finds that the sensitivity is 67% and specificity is 93% for the

Phalen's test in identifying people with carpel tunnel syndrome

(Rayegani et al, 2016). This suggests that the Phalen's test would be

most useful:

As an assessment for identifying people that do not have carpal tunnel syndrome