A random sample of 8 years of Denver, Colorado weather records gave a sample average number of sunny days per year of 263 sunny days with standard deviation 24 days. An independent random sample of 6 years of weather records from Phoenix, Arizona had an average of 296 sunny days per year with standard deviation 18.3 days. Test to see if the population mean numbers of sunny days are different for the two cities. Use a 1% significance level.

The angles below are supplementary. what is the value of x? a pair of supplementary angles is shown. one angle measures 7x + 33, and the other angle measures 70. 5.3 8.14 11 14.7

An angle that measures between 90 and 180° is called a(,

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?