URM Exam 2

The term that describes the position of the hump in the curve of a distribution is:

skewness

A researcher finds a correlation of .70 between popularity ratings and self-concept scores. What percentage of common association can be inferred between the two variables?

49%

A null hypothesis is:

A statistical hypothesis that assumes there is no difference among the effects of treatments

If a researcher finds a small difference in avg test scores between large sample (same size) of control participants, it is very likely that the difference is:

statistically significant but does not have a high degree of meaningfulness

Four skills tests are tried as predictors of success in tennis class. Each test correlates with later success as follows; test A = .27, test B = -.90, test C = -.4-. test D = .65. The test that will most accurately predict success is:

test B

A main disadvantage of nonparametric techniques that has frequently been stated (although there is some disagreement)

Are not as powerful (less likely to detect a false null hypothesis) as a parametric technique

A statistical technique that test for significant differences between observed and expected frequencies of occurrence is:

Chi square

Comparing test items with the course objectives (course topics) checks which type of validity?

Content

Prediction studies use which of the following as the basic analysis technique

Correlation

A measure of meaningfulness that expresses the difference between the experimental and control group in standard deviation is the:

Effect size

How does one describe a distribution that has many more high scores than low scores?

Negatively skewed

In multiple regression, one is able to predict:

One criterion from two or more predictors

Lining students up according to height without actually measuring height represents what level of measurement? a. nominal b. ordinal c. interval d. ratio

Ordinal

A thermometer measured the temperature in an oven as 400 degree five days in a row when the temperature was actually 337 degree this measure instrument would be considered

Reliable but not valid

If there is a negative relationship between two physical measures

The value of one measure increases as the value of the other measure decreases

Which hypothesis is stated in the null form?

There is no significant difference between the vocabulary scores of average and high ability students

The correlation between x and y is .90. What can be said with certainty about y in relation to x?

They are related

If the researcher fails to reject the null hypothesis when there really is a difference, this is an example of a:

Type II error

If ANOVA has found a significant different among four treatment groups, a post hoc analysis is needed to determine:

which of the groups differ significantly from the others

Validity is determined by finding the correlation between scores on:

A test and some independent criterion

A threat to validity of rating scales is that the rater may tend to let her previous knowledge of the student in another capacity influence the rating. This threat is called the...

Halo effect

Oxygen uptake capacity measured in liters per minute is an example of which type of measurement

Ratio scale measurement