A survey was conducted to compare the mean cost of a meal at fast food restaurants in two different cities. City in Sample mean $4.05 $0.55 26 $0.85 B 32 $5.15 Assume that the population variances of both groups are different. Calculate the test statistic to test whether there is sufficient evidence that the mean costs of a meal at fast food restaurants in City A is at least $0.5 cheaper than that in City B.

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