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PSYC 354 Quiz 8: The One-Sample t-Test As sample size increases, the distribution of t statistics becomes flatter and more spread out. Two samples are selected from a population, and a treatment is administered to the samples. If both samples have the same mean and the same variance, a researcher is more likely to reject…
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PSYC 354 Quiz 7: Introduction to Hypothesis Testing Which statement below is consistent with making a Type I error? A researcher is interested in whether a new teaching method influences the public speaking skills of students in an introductory communications class. The researcher knows that public speaking skills in the class are normally distributed with…
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PSYC 354 Quiz 6: The Distribution of Sample Means Standard error allows sampling error to be defined and measured. Which symbol is used to identify the standard error of M? The standard error equation can be rewritten to √(σ2/n). Samples of n = 9 scores are selected from a normal population. If the distribution of…
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PSYC 354 Quiz 5 Probability The tail is on the right side of a normal distribution for any z-score value greater than zero. All probabilities can be expressed as decimal values ranging from 0.00 to 1.00. The symbol p refers to percentage. When finding percentile ranks for a percentile, the focus is always on identifying…
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PSYC 354 Quiz 4: Standard Deviation and z-Scores Which z-score corresponds to a score that is above the mean by 2 standard deviations? One purpose of a z-score is to provide an understanding of the exact location of a score in a distribution. Which z-score value represents the location farthest from the mean? Transforming an…
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PSYC 354 Quiz 3: Variability For a sample with M = 10 and s = 2, a score of X = 13 would be considered an extreme score, far out in the tail of the distribution. Data sets can be divided into four quartiles. If sample variance were to be computed by dividing SS by…
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PSYC 354 Quiz 2: Central Tendency A researcher records the list of finishes (e.g., 1st, 2nd, 3rd, 4th) for a track team throughout their season. The mean is the best measure of central tendency to report in this circumstance to describe the most typical finish for this track team. The value of X = 9…
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PSYC 354 Quiz 1: Introduction to Statistics, Frequency Tables, and Graphs A group of quiz scores ranges from 3 to 10, but no student had a score of X = 7. If the scores are put in a frequency distribution table, X = 7 would not be listed in the X Which of the following…