Two different hardening processes, namely saltwater quenching and oil quenching are used on amples of a particular type of metal alloy. The hardness (in N/mn³) results are shown in Table 4. Assume that hardness is normally distributed. Calculate the 98% confidence interval for the ratio of two population variances for two different hardening processes saltwater quenching and oil quenching. Interpret the result. Table 4 Saltwater Ouenching Oil Ouenching

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QUESTION 5
Two different hardening processes, namely saltwater quenching and oil quenching are used on
samples of a particular type of metal alloy. The hardness (in N/mn?) results are shown in Table 4.
Assume that hardness is normally distributed. Calculate the 98% confidence interval for the ratio
of two population variances for two different hardening processes saltwater quenching and oil
quenching. Interpret the result.
Table 4
Saltwater Quenching
Oil Quenching
145
152
150
150
153
147
148
155
141
140
152
146
146
158
154
152
139
151
148
143
Transcribed Image Text:QUESTION 5 Two different hardening processes, namely saltwater quenching and oil quenching are used on samples of a particular type of metal alloy. The hardness (in N/mn?) results are shown in Table 4. Assume that hardness is normally distributed. Calculate the 98% confidence interval for the ratio of two population variances for two different hardening processes saltwater quenching and oil quenching. Interpret the result. Table 4 Saltwater Quenching Oil Quenching 145 152 150 150 153 147 148 155 141 140 152 146 146 158 154 152 139 151 148 143
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