According to state troopers, the mean speed on the Western Virginia Turnpike is 72 miles per hour. Representatives for the local motorist club simply disagree, acknowledging the actual mean spead might be slower or faster; they commission a sample of size 36, and from it is calculated a sample mean of 73.5 miles per hour. According to industry standards, the population standard deviation is acceptably assumed to be 4 miles per hour. Test the claim at a 98% level of confidence. WHAT IS THE UPPER AND LOWER BOUND OF THE CONFIDENCE INTERVAL??

Walgreens sells both kleenex and nyquil. in a random sample of 5000 purchases, it was found that 1200 contained kleenex and 540 contained nyquil. these are not independent because sick people are more likely to buy both and healthy people more likely to buy neither. in looking into that, it was found that 360 purchases contained both. a. make a two-way table to display this information. fill in the table with the missing entries, and be sure your table has row and column totals. b. if we randomly select a purchase that contained kleenex, what is the probability it also contained nyquil? c. what percent of all purchases didn’t contain either product?