Please turn into instructor after completing required operations

 

                Part # 4A

                Part Desc: Fundamentals of SPC

                Quantity Req.: 80% Required (4 pts per answer)

 

 

1.  Consider the following data . Blueprint Specification = 2.250

 

 

 

 

 

 

 

 

 

 

 

 

1. Code the data (hint: 2.251 should equal 1 coded)

 

 

 

 

 

 

 

 

 

 

2. Find the mean.

 

3. Find the sample standard deviation.

 

 

2. Below you will find a standard bell curve. Statisticians have found that 99.7% of all parts will be within +/- 3 standard deviations. Label the percentage amounts of any parts that will fall under each deviation. (This does not apply to any particular parts) Fill in the generic percentages.

 

 

2%

 

 

 

 

3. Holes are measured after a drill press operation. The mean was found to be 1 (coded data) and the standard deviation was found to be 3 (coded data).

 

1. Label the parts of the bell curve with the actual standard deviations (coded) and the percentages.

 

 

 

1

 

 

 

 

 

2. If 1,000 parts are run, how many will be between  -5 and -2 ?

 

 

 

3. How many parts will be between –2 and +4 ?

 

 

 

4. If our tolerance was –2 to + 7, how many scrap parts would we have?

 

 

 

 

4. Consider the following data.  -3, 2, -1, -2, -4, -1, -2, 0,-2, 3, 0, -1, -1, 4, 2, 2, 0, 0, 1, 4

 

a.        Calculate the mean

 

 

 

b.       Calculate the sample standard deviation.

 

 

             

 

 

 

 

 

 

 

 

 

c.        Construct a histogram by shading in the boxes and labeling the chart.

 

 

                              

 

 

                               

 

 

 

 

 

 

d.       Does it look like normal distribution? (circle one )         Yes        or       No