Intro to Stats
Frequency Distributions
Central Tendency
Variability & Z-Scores
Probability
100
A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surveys that were completed and returned, the researcher finds that these students spend an average of 4.1 hours each week working on course material outside of class. For this study, the set of 56 students who returned surveys is an example of a _________________.
What is a sample?
100
The number of scores in the data set is found by summing this column of a frequency table.
What is the f column?
100

The mean for the following scores: {1, 6, 14}

What is seven?

100
This is the average distance of all scores from the mean.
What is the standard deviation?
100

The column in the Normal Curve (Z) Area Probabilities table which would help you find the proportion of scores in the lowest 10% of the graph.

What is "% in tail" column?

200
The value of (ΣX)^2 or the following scores: {3, 0, 5, 2}
What is 100?
200
In a frequency distribution graph, frequencies are presented on the ___-axis and the scores (categories) are listed on the ___-axis.
What is y, then x?
200
The measure of central tendency a researcher would use if she was investigating eye color for a sample of N = 50 people.
What is the mode?
200
The z-score which is used for one standard deviation below the mean.
What is -1?
200
A jar contains 7 red Twizzlers and 29 black Twizzlers. Sandra draws one black Twizzler from the jar and eats it. When she reaches in to grab another, the probability of her randomly selecting a red Twizzler this time:
What is 7/28 = ¼ = 25%
300
Using letter grades (A, B, C, D, and E) to classify student performance on an exam is an example of measurement on a(n) _______ scale of measurement.
What is an ordinal scale?
300
The term used to describe the shape of a distribution in which the scores pile up on the right-hand side of the graph and taper off to the left.
What is a negative skew?
300
The shape of a distribution of scores in which the median would be less than the mean, but greater than the mode.
What is a positive skew?
300
Fernando consistently receives good grades in classes, while Esther receives high grades in some courses and low grades in others. _______________’s grades have a smaller standard deviation.
Who is Fernando?
300

A population of scores has μ = 100 and σ = 10.  That means that approximately 2/3 (68%) of the population will have a raw score between _____ and _____.

What is 90 and 110?

400
A recent study reports that elementary school students who were randomly assigned to receive a 30 minute recess each morning had higher test scores than students who received a 20 minute recess. For this study, the independent variable is_______________.
What is the length of the recess (OR 30 minute group vs. 20 minute group)?
400
The classrooms in the Psychology department are numbered all the way from 100 to 120. A professor records the number of classes held in each room during the fall semester. If these values are presented in a frequency distribution graph, what kind of graph would be appropriate?
What is a histogram? OR What is a polygon? BONUS if you said "grouped" too!
400
Is possible for more than half of the scores in a distribution to have values greater than the mean?
What is yes?
400

True or false: If students in the 8am class earn M = 85, SD = 5 on an exam, and students in the 10am class earn M = 83, SD = 10 on the same exam, then students in the 10am class did better on average.

What is false. 

400

Percentage of the sample that scores between z = -0.75 to z = 0.75?

What is 0.75 to mean = 27.34%. 27.34+27.34 = 54.68%

500
The additional information obtained when you measure a variable on an interval scale compared to a ordinal scale.
What is the SIZE of the difference?
500
The shape of the distribution when the variability of scores (or standard deviation) is very high.
What is platokurtic?
500
For a perfectly symmetrical distribution with µ = 30, this is the mode.
What is 30?
500

For a population with µ = 40 and σ = 8, the z score corresponding to X = 44.

What is z = 0.5?

500
Last week, Luigi had exams in Math and in Art History. On the Math exam, the mean was µ = 30 with σ = 5, and Luigi had a score of X = 45. On the Art History exam, the mean was µ = 60 with σ = 8 and Luigi had a score of X = 68. The class which Luigi did better in.
What is Math?
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