The monthly advertising expenditure of discount hardware store is normally distributed with a known standard deviation of $100. if a sample of 10 randomly selected months yields a mean advertising expenditure of $500 monthly, what is the lower bound for the 80% confidence interval for the mean of the store's monthly advertising expenditure?

Aprofessional hockey team has noticed that, over the past several seasons, as the number of wins increases, the total number of hot dogs sold at the concession stands increases. the hockey team concludes that winning makes people crave hot dogs. what is wrong with the hockey team's conclusion? a) it does not take into account the attendance during each season. b) it does not take into account the number of hamburgers sold during each season. c) it does not take into account the number of concession stands in the hockey arena. d) it does not take into account the number of seasons the hockey team has been in existence.