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1.) Scott is the owner of a tool and die shop. He has hired you to check his machine's calibration prior to starting production on

1.) Scott is the owner of a tool and die shop. He has hired you to check his machine's calibration prior to starting production on a large order. To check this, you set the machine to create 1.5 inch screws and manufacture a random sample of 200 screws. That sample of screws has an average length of 1.476 inches with a standard deviation of 0.203 inches.

Does this sample provide convincing evidence that the machine is working properly or should it be shut down for repairs? Justify your reasoning mathematically.

2.)The cost and customer rating of 15 cars is shown on the scatterplot (image attached). The cars are rated on a scale of 0 to 100.

image text in transcribed
120 100 80 Rating 60 40 20 0 2,000 2,500 3,000 3,500 4,000 4,500 5,000 Car Price, US Dollars

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