A paint supplier claims that a new additive will reduce the drying time of its acrylic paint. To test this claim, 12 panels of wood were painted, one-half of each panel with paint containing the regular additive and the other half with paint containing the new additive. The drying times, in hours, were recorded as follows: Drying Time (hours) Panel New Additive Regular Additive 1 2 3 4 5 6 7 8 9 10 11 12 6.4 5.8 7.4 5.5 6.3 7.8 8.6 8.2 7.0 4.9 5.9 6.5 6.6 5.8 7.8 5.7 6.0 8.4 8.8 8.4 7.3 5.8 5.8 6.5 Use the sign test at the 0.05 level to test the null hypothesis that the new additive is no better than the regular additive in reducing the drying time of this kind of paint.
Section 8: Statistics in Liberal Arts Stat 2220, Espey ➢ Stylometry/stylostatistics: investigation of qualitative features of style (deciding authorship by comparing writing styles) ○ Comparing rates of word use, especially non-contextual words ○ Histograms show the distribution of a sample ➢ Box Plot: graphs a 5-number summary of the data, showing its spread and skew ○ Smallest value ○ 25th percentile ○ 50th percentile ○ 75th percentile ○ Largest value ➢ Determining Percentiles: (n × p) where n = sample size and p = percentile in decimal form ○ When n × pequals a whole number, take the average of this ordered value and the next one ○ When n × pequals
