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stats exam 2-practice

# stats exam 2-practice - 1 In an experiment an independent...

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1. In an experiment, an independent variable is and a dependent variable is . a. manipulated, measured b. measured, manipulated c. continuous, manipulated d. discrete, continuous 2. A normal distribution must ______________. a. have outliers b. be symmetric c. be positively skewed d. be negatively skewed 3. If a distribution of the ages of people is positively skewed, which of the following is most likely correct? a. There are about the same number of young people as old people b. There are more young people than old people c. There are more old people then young people d. none of the above 4. The main advantage of the median over the mean is that it ____________. a. is not affected by extreme scores (outliers) b. is easier to calculate c. varies less from sample to sample d. all of the above 5. The mode of the following set of data 3 2 5 5 3 5 2 3 1 4 5 2 is _______________ a. 2 b. 3 c. 4 d. 5

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6. Which of the measures of central tendency can be defined as the 50 th percentile? a. the mean b. the median c. the mode d. the trimmed mean 7. Which of the following is NOT a measure of variability? a. the mean b. the standard deviation c. the variance d. the range 8. The difference between s and σ is that ____________. a. s is for the sample and σ is for the population b. s is for the population and σ is for the sample c. s is the standard deviation and σ is the variance d. s is the variance and σ is the standard deviation 9. Simply put, the standard deviation tells us ____________ a. what the general theme of our data is b. on average, how much scores deviate from the median c. on average, how much scores deviate from the mean d. none of the above 10. A z-score of 1.5 represents a score that is ____________ a. 1.5 standard deviations above the mean b. 1.5 standard deviations below the mean c. .5 standard deviations above the mean of 1 d. .5 standard deviations below the mean of 1
11. A researcher is interested in whether the amount of alcohol one consumes predicts levels of breast cancer. If you were going to plot that relationship on a scatterplot, you would most likely plot: a. Alcohol consumption on the Y-axis and incidence of breast cancer on the X-axis.

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stats exam 2-practice - 1 In an experiment an independent...

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