Question

QUESTION 1

1. Right now I am in the beautiful city of Vancouver, Canada but can't enjoy my time here since I have to put the homework online for you to learn. There is a place called Grouse Mountain which has a very nice view of the whole city at night and a few good restaurants. There are a lot of tourists like myself. I would like to know what is the proportion of the tourists are from the USA?

   Suppose that I randomly ask n, 140 number of tourists whether they are from the USA and I got X 46 number of the people I asked are from the USA.

   What is the upper level (UL) of the 95% confidence interval that the proportion of all the tourists are from the USA?

   Tip: Using the template for interval estimation for the population proportion, enter the sample proportion as X/n, example: if n=150 and X = 130, X/n = 130/150 = 0.866666667 or 86.66667%, you enter 0.8667 (4 decimals in the template).   

   Write with 4 decimals, for example, if it is 64.334%, write: 0.6433.

QUESTION 2

1. Again it is related to my trip to Vancouver:

   Fly to Vancouver and to have a vacation is not a cheap trip. I would like to know the average USD amount two people (a couple) spend, the total amount, including Airfares, Hotel, Car Rental, Meals, and all other expenses. So again, I randomly ask n 48 couples of tourists in the Airport: how much money each couple spent in the whole trip since they, like us, are ready to fly back home.

   I then put each individual couple's $ amount into my Excel sheet in one column. I actually calculated the sample mean = 1,079 and sample Standard Deviation = 114, assume I want a 95% confidence interval.

   Tell me the lower confidence level with 2 decimals (Dollar amount), ex. if the answer is $1256.786, write 1256.79.   

   Tip: Use the template you created following my video.

Answer 1