Final Exam Review PSY 136

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One

A _____________ tailed test is used for a directional hypothesis.

weak, positive

A correlation coefficient of .15 indicates ___________________

the raw score or x value is below the mean

A negative z score indicates that ________________________

Directional

A researcher hypothesizes that adults are more likely than juveniles to have been arrested for spending. This is a _____________________________ hypothesis.

no relationship

An r value of zero represents _____________________

strength and direction

Correlation r indicates

interval or ratio

Correlation utilizes variables that are _________________ levels of measurement

Increase sample size

How can standard error be decreased?

95%

How confident are we that a population parameter lies within two standard error units of the sample statistics?

t distribution or t value is the same as z distributions or z value

If n becomes large, greater than 30 then _______________________________

-1 to +1

If the coefficient of termination (r square) is equal to 1, then the coefficient can be _______________

12

If the regression equation is Y= 12 + 1.8x the intercept is _______.

reject null hypothesis

If the significance is less than or equal to .05 then ___________.

reject the null hypothesis

Larger the t value, the more likely we are to

increase the sample size

One common method for decreasing standard error is to

Estimated difference between the sample statistic and population parameter

Standard error is best defined as

between group variance > within group variance

The F ratio indicates

residual error

The amount of variation in the dependent variable that is unexplained or unaccounted for the regression model is ___________________

True

The dependent variable is in the form of the continuous variable (interval or ration level)

the larger the z score value

The more distance the raw score is from its mean score ________________

increases, decreases

The negative slope indicates that if X _________ in value, then Y _________ in value

Probability

The number of times a particular outcome can occur divided by the number of times that any outcome can occur is known as

intercept

The point at which the regression line crosses the Y axis is an

slope and intercept

The regression line is a function of the __________ and the ____________.

F test

The statistical test used to determine the significance of a regression model is

True

There is no practical limit to the number of groups

higher

We expect between group difference should be ____________ than between group difference

34.13%

What percent of the area under the normal curve lies between the mean (0) and 1 standard deviation unit above the mean?

Type II Error

When the null hypothesis is accepted when it is false; referred to as beta

confidence level

When the sample size is small (≤ 30), the t distribution is used to measure the _________________ .

mean

When z=0, the raw score (x) equals

Bimodal

Which of the following is NOT a characteristic of the normal curve?

William S. Gossett

Who developed the distributions for small sample under the pseudonym 'Student'?

Independent t test

a test of difference between sample means

one-way analysis of variance

analysis of variance in which there is only one grouping variable

Degree of freedom

n-1

Null hypothesis

states that there is no relationship

Analysis of variance (ANOVA)

statistical test that is designed to examine the variability among three or more groups

Type I Error

when the null hypothesis is rejected when it is true; referred to as alpha or level of significance


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