Question

Independent random samples of weekend and weekday shoppers were selected and amount spent per trip to...

Independent random samples of weekend and weekday shoppers were selected and amount spent per trip to the mall was recorded as shown in the following table. Obtain 95% confidence interval for the difference of the mean amount spent. Is there sufficient evidence to claim that there is a difference in the mean amount spent per trip on weekend and weekday? Assume normality, equal variances, α = 0.05. (z0.025 = 1.96, t0.025,47 = −2.0117, t0.025,45 = −2.0141)

Sample size (n) weekends 25 weekdays 22

Average (X) weekends $85 weekdays $55

Just trying to check my work. Thanks

Sample std dev (s) weekends $8 weekdays $7

Homework Answers

Answer #1

To calculate the confidence intervel we will use t distribution.

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