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Many fast-food restaurants have soft drink dispensers with preset amounts, so that when the operator merely pushes a button for the desired drink the cup

Many fast-food restaurants have soft drink dispensers with preset amounts, so that when the operator merely pushes a button for the desired drink the cup is automatically filled. This method apparently saves time and seems to increase worker productivity. To test this conclusion, a business analyst randomly selects 18 workers from the fast-food industry, 9 from a restaurant with automatic soft drink dispensers and 9 from a comparable restaurant with manual soft drink dispensers. The samples are independent. During a comparable hour, the amount of sales rung up by the worker is recorded. Assume that [Math Processing Error]=.01 and that a t test is not appropriate. Test whether workers with automatic dispensers are significantly more productive (higher sales per hour).

Automatic Dispenser

Manual Dispenser

$153

$105

128

118

143

129

110

114

152

125

168

117

144

106

137

92

118

126

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