Restaurant Magazine wants to rate a particular restaurant. They go out and ask 50 randomly selected customers to give a rating between 1 and 10 so they can estimate the population mean rating. At the 95% level, create a Confidence Interval and make a concluding statement using the data in the range A5:A54. Use the spreadsheet to make all your calculations. You may use whichever method you want from amongst the three methods we learned in class to make your calculations.
A bottle of “Cold Kool Cola” is labeled as having 32 oz. of catsup. The bottle filling factory wants to make sure the filling machine is filling accurately. They do not want to fill too little and make customers unhappy, and they do not want to fill too much and thus decrease profits. At the alpha level of 0.05 is the process out of control? (From the companies data they estimate the population standard deviation to be 0.3 oz.). Using the sample data from the range A9:A53 and the cells in the spreadsheet run a hypothesis test and write a concluding statement.
Friendly Cabinet Makers is a company that builds cabinets for houses. The company recently employed a new building technique that is supposed to save time over the old method which had a mean of 6.5 hours. Friendly Cabinet Makers wants to determine if the new method actually saves time. A random sample was taken of number of hours to build a deck. At the .05 significance level, can Friendly Cabinet Makers conclude that the new method is faster? Using the data in the range A10:A59, run a hypothesis test and make a concluding statement.
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