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Practice exam questions for a statistics course, specifically for the introductory statistics class (stat 269). The questions cover various statistical concepts such as finding means, medians, variances, standard deviations, interquartile ranges, and constructing stem-and-leaf plots and boxplots. Students are expected to apply statistical methods to given datasets.
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Practice Exam I
29.3 28.9 32.9 36.5 25. 14.7 58.4 48.6 12.8 21. 3.4 6.6 40.6 12.9 19.
(a) Find the mean, and median of this dataset.
(b) Find the variance, standard deviation, and iqr for this dataset.
(a) If 20 random cities are selected and the murder rate for 2001 obtained, what kind of sample is this?
(b) If two di erent groups were to select 20 random cities, the values they get may di er. This is an example of what kind of error?
(c) When entering the results into a computer for analysis, a clerk accidently types 31.5 instead of 13.5. This is an example of what kind of error?
(d) The variable of interest here is the murder rate. What is the level of measurement of this variable?
