Question

The number of contaminating particles on a silicon wafer prior to a certain rinsing process was determined for each wafer in a sample of size 100, resulting in the following frequencies: Number of particles 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Frequency 1 3 3 12 11 15 18 10 11 4 5 3 1 2 1 (a) What proportion of the sampled wafers had at least one particle? At least five particles? (Round your answers to two decimal places.) at least one particle Answer:____ at least five particles Answer: (b) What proportion of the sampled wafers had between five and ten particles, inclusive? Strictly between five and ten particles? (Round your answers to two decimal places.) between five and ten particles, inclusive Answer:_ strictly between five and ten particles Answer:___ (c) Draw a histogram/bar chart using relative frequency on the vertical axis. Answer:How would you describe the shape of the histogram? Answer: _The histogram is fairly symmetric and bimodal. _The histogram is fairly symmetric and unimodal. _The histogram is negatively skewed and unimodal. _The histogram is positively skewed and unimodal. _The histogram is positively skewed and bimodal. ___The histogram is negatively skewed and bimodal.

          The number of contaminating particles on a silicon wafer prior to a certain rinsing process was determined for each wafer in a sample of size 100, resulting in the following frequencies:

Number of particles     
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
Frequency
1
3
3
12
11
15
18
10
11
4
5
3
1
2
1

(a) What proportion of the sampled wafers had at least one particle? At least five particles? (Round your answers to two decimal places.)
at least one particle    
Answer:__________
at least five particles    
Answer:__________

(b) What proportion of the sampled wafers had between five and ten particles, inclusive? Strictly between five and ten particles? (Round your answers to two decimal places.)
between five and ten particles, inclusive    
Answer:___________
strictly between five and ten particles    
Answer:___________

(c) Draw a histogram/bar chart using relative frequency on the vertical axis.
Answer:How would you describe the shape of the histogram?
Answer:
_____The histogram is fairly symmetric and bimodal.
_____The histogram is fairly symmetric and unimodal.    
_____The histogram is negatively skewed and unimodal.
_____The histogram is positively skewed and unimodal.
_____The histogram is positively skewed and bimodal.
_____The histogram is negatively skewed and bimodal.

Added by Carlos S.

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