PSY 3010 Midterm Review

A sample in which every member of the population has an equal chance of being selected into the study is called a _____

Which of the following statements is TRUE about random assignment?

Consider this distribution of scores: 2, 2, 8, 10, 10, and 37. Within the context of this distribution, the number 37 is

A parameter is a number based on:

The hypothesis that states that there is no difference (no effect) is called the ___.

A confound is an example of

In an intro psych class of 100 students, there are 27 psychology majors. What is the proportion that are psych majors?

As sample size increases, the shape of the sampling distribution becomes

Which of the following is NOT an example of a measure of central tendency?

I predicted the experimental group would be higher than the control group, but the control was higher. Which is true?

Does time of day (morning, afternoon, evening) affect test performance? How many levels of the IV are there?

Which measure of central tendency would be best for the pictured distribution?

The average of the squared deviations from the mean is referred to as the:

Which of the following graphs would be most appropriate for scale (continuous) data?

_____ statistics involves drawing inferences about parameters of the population(s) from which you have sampled.

Generalizability is another way of describing

You reject the null, but shouldn't have (your sample is extreme due to random chance, not the IV), what error is this?

Approximately what percent of scores falls within 1 standard deviation from the mean?

Jenna firmly believes that orange juice protects her from illness, despite reading research showing otherwise. This is

You calculate a variance of 16. What is your standard deviation?

A class test has a mean of 50 and a standard deviation of 10. If your test score is 55, what is your z-score?

Does time of day (morning, afternoon, evening) affect test performance? What's the independent variable?

What's the probability of randomly selecting a psych major from the class (100 students, 27 psych majors)?

Same class (mean=50, SD=10). What's the approximate percentile for a raw score of 60? Use the empirical rule to estimate

Does time of day (morning, afternoon, evening) affect test performance? What's the DEPENDENT variable?

Sum of squares divided by degrees of freedom (SS/df) is the formula for

When a researcher uses a convenience sample instead of a random sample, the researcher is limiting the study's:

Which of the following terms BEST describes the following distribution of scores: 2, 3, 7, 7, 7, 7, 8, 9, 10, and 15?

Which of the following is an example of a directional (one-tailed) hypothesis?

We failed to reject the null, but the null is false (should have been rejected). What kind of error is this?

Which type of measure of central tendency is MOST appropriate to use with nominal (categorical) data?

This picture shows the critical region for a one-tailed z-test. Your z-statistic = 1.25. What is your decision?

A distribution of z scores has a known mean and standard deviation. What are the mean and SD?