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Definition
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Definition
| a hypothesis test designed to evaluate the mean differences from research studies producing two or more sample means |
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| two assumptions related to sample t tests |
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Definition
1) the observations within each tx condition must be independent
2) the population distribution of difference scores (D values) must be normal |
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| when the researcher manipulates a variable to create the tx conditions in an experiment, this variable is called the _____ |
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| Two interpretations of ANOVA |
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Definition
1) there is really no difference between populations
2) he populations really do have different means and these pop mean differences are responsible for causing systemic differences between sample means |
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Definition
| in ANOVA, the variable (independent or quasi-independant) that designates the groups being compared is called a _____ |
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| the individual conditions or values that make up a factor are called _________ of the factor |
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| two-factor design or factorial design |
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Definition
| a study that combiners two factors (such as therapy type and period of time) |
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Definition
You wanted to know the number of courses that first year students take during their freshman year at a college. So, you requested the roll of all the students by code number to safeguard their identity along with the number of courses they registered in from the Admissions Office. The students you surveyed comprise
a. Population
b. Sample
c. Statistic
d. Parameter |
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Definition
Which of the following statistical techniques summarizes, organizes, and simplifies data?
a. Sample statistics
b. Population statistics
c. Descriptive statistics
d. Inferential statistics |
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Definition
A study on shift work, particularly the graveyard shift, shows a relationship between productivity and the amount of light in the factory. Which is the dependent variable?
a. Hour of the evening
b. Amount of light
c. Sleepiness of the workers
d. Amount of work done |
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Definition
A yearly study ranks cities around the world in terms of livability. What scale is used?
a. Nominal
b. Ordinal
c. Interval
d. Ratio |
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Definition
A teacher made a frequency distribution of the midterm scores of her students then showed the results as a graph to her class. Which of the following is most appropriate?
a. A bar graph
b. A histogram
c. A normal curve
d. A polygon |
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Definition
What is the 80th percentile in a grouped frequency distribution if the cumulative percentage of 80% corresponds to the interval 70–74:
a. 69.5
b. 70.5
c. 73.5
d. 74.5 |
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Definition
In a frequency distribution graph, the scores are always on the X axis and the frequency values are on the Y axis.
a. True
b. False |
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Term
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Definition
In a symmetrical curve, which of the following is true?
a. Mode = mean
b. Median = mode
c. Mean = median
d. Any of the above |
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Term
| most of the students scored below the median cannot be correct |
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Definition
Your teacher computed the mean, median, and mode of your midterm exam. Which of the following statements cannot be an accurate description of the scores?
a. Most of the students scored below the mode.
b. Most of the students scored below the mean.
c. Most of the students scored below the median.
d. None of the above statements is correct. |
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| the mean is between 5 and 10 |
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Definition
The lowest score in a test of all the Grade 3 students attending a school is 5 and the highest is 10. Which of the following could you conclude?
a. The standard deviation is below 6.
b. The mean is between 5 and 10.
c. The median is 7.5.
d. None of the above is correct. |
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Definition
A population distribution has a μ = 80 and σ = 6. If a z-score of z = 2.00, this means that the value of X score is:
a. 2 points below the mean
b. 92
c. 2 points above the mean
d. 82 |
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Term
| both your z-scores are negative (because both are below the mean (average) |
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Definition
You wrote two exams, one in Statistics and the other in Sociology. You scored 5 points below the mean in both exams. What can you say about your scores?
a. Both of your z-scores are positive.
b. Both of your z-scores are negative.
c. Fifty-five per cent of the scores are above you.
d. Your scores in both are equivalent to the 45 percentile. |
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Definition
A box contains 10 large red marbles, 12 small red marbles, 10 large green marbles and 12 small green marbles. What is the probability of randomly picking a small marble?
a. 12/24
b. 12/44
c. 24/24
d. 24/44 |
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Definition
A population has μ = 50 and σ = 10. What is the standard error of the distribution of sample means if samples of n = 25 are selected from this population?
a. 2
b. 5
c. 2.5
d. 0.4 |
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Term
| rejects a null hypothesis that is correct |
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Definition
A Type I error means that the experimenter:
a. Rejects a Ho that is correct.
b. Fails to reject a Ho that is wrong.
c. Rejects a Ho that is wrong.
d. Fails to reject a Ho that is correct. |
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| medium (0.2=small 0.5 = medium 0.8= large) |
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Definition
Your study is a repeated-measures design that yielded a t that is p<.05. You then obtained an estimated Cohen’s d = 0.50. How would you describe the effect size?
a. Small
b. Medium
c. Large
d. None of the above. |
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Term
| Sums of squares within the treatments |
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Definition
In ANOVA, the size of the sample variances directly influences which of the following?
a. Total sums of squares
b. Sums of squares between the treatments
c. Sums of squares within the treatments
d. All of the sums of squares |
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