U.C.L.A. states that at least 40% of the students live on campus. From a sample of 250 students, 90 live on campus. Does this sample provide evidence that fewer than 40% live on campus? Conduct the test with a=0.01.

9 squirrels were found to have an average weight of 11.6 ounces with a sample standard deviation of 2.4 ounces. Find the 95% confidence interval of the true mean weight?

A recent gasoline survey said that the national average price of gasoline was$2.904 a gallon. It was felt that gasoline in Missouri was significantly lower than the national average. A survey of 36 different communities in Missouri found the average price of gasoline to be $879 a gallon with a standard deviation of %0.080. Conduct a hypothesis test using the p-value method with a= .05 to determine if the price of gas in Missouri is less than the national average?

Do dermatologists earn about the same incomes as NFL players. Suppose of 38 dermatologists reveals a sample with a average weekly income of $2,500 and with a standard deviation of 418. A sample of 36 NFL players shows an average weekly in come of $2,900 with a population standard deviation of 432. Conduct a hypothesis test with a= 0.05 to determine if there is evidence that there is a difference between the dermatologists income and the NFL player income?