Refer to the bolt strength problem17.47. Assuming µ = 6,050 and σ=100with n = 3, then LCL = 5,876.8 and UCL = 6,223.2.Below are five sets of 20 sample means using n= 3.Test each set of means for the pattern suggested in the column heading. This is a visual judgment question, though you can apply Rules 1-4 if you wish.
Up Trend? | Down Tred? | Unstable? | Cycle? | Osilate? |
5,907 | 6,100 | 6,048 | 6,079 | 6,122 |
6,060 | 6,009 | 5,975 | 6,029 | 5,983 |
5,987 | 6,145 | 6,092 | 6,006 | 6,105 |
5,919 | 6,049 | 5,894 | 6,012 | 6,024 |
6,029 | 6,039 | 6,083 | 6,093 | 6,123 |
6,114 | 5,956 | 6.069 | 6,124 | 6,022 |
6,063 | 6,103 | 6,073 | 6,092 | 6,082 |
6,084 | 6,140 | 5,972 | 6,114 | 6,018 |
5,980 | 6,054 | 6,112 | 6,071 | 6,031 |
6,056 | 6,062 | 5,988 | 6,097 | 6,107 |
6,078 | 6,042 | 6,006 | 6,038 | 6,031 |
6,1 18 | 6,152 | 6,226 | 6,099 | 6,047 |
6,051 | 5,961 | 5,989 | 6,000 | 6,055 |
6,021 | 5,926 | 6,111 | 6,004 | 6,041 |
6,068 | 6,109 | 6,026 | 6,054 | 5,972 |
6,157 | 5,904 | 6.057 | 6,083 | 5,987 |
6,041 | 6,049 | 6,098 | 6,148 | 6,043 |
6,129 | 6,042 | 6,082 | 6,071 | 6,137 |
6,026 | 5,847 | 6,050 | 6,050 | 5,930 |
6,174 | 6,033 | 6,084 | 6,092 | 6,057 |
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