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1. Suppose that a histogram of a data set is approximately symmetric and " bell shaped ". Approximately what percent of the observations are within one standard deviation of the mean?
2. The average score for a class of 30 students was 75. The 20 male students in the class averaged 70. The 10 female students in the class averaged:
3. If a variable has possible values – 2, 6, and 17, then this variable is
4. Since the population is always larger than the sample, the population mean:
5. A population includes:
6. A time series plot is essentially a:
7. The mode is best described as the
8. A variable is classified as ordinal if:
9. A histogram that has a single peak and looks approximately the same to the left and right of the peak is called:
10. What kind of relationship between x and y is demonstrated by the scatter plot below?
11. A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is:
12. The median can also be described as:
Accepted characters: numbers, decimal point markers( period or comma), sign indicators(-), spaces( e. g., as thousands separator, 5 000), " E " or " e "( used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.