Assign_3_Daumer

# 10 obtain the appropriate test statistic from the

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10. Obtain the appropriate test statistic. From the SPSS menus choose A nalyze and Compare M eans, followed by the appropriate test. What is the value of the t statistic and probability value on the SPSS printout? Since the value (Sig.) from Levene’s test is 0.053, equal variances can be assumed. The t value is -1.572 and the probability value is 0.123. 11. What is your decision concerning the null hypothesis? Did you reject or retain? Provide a rationale. The null hypothesis should be rejected because the significance level (probability value) is greater than 0.05 at 0.123. 12. What are some variables unaccounted for that may have impacted your results? Write this paragraph in terms of potential limitations of your results. The provided description of this research investigation is limited and does not provide a true picture of the experiment’s possible variables. The preliminary look at the details seems to show decent internal validity; however, some external influences or unknowns could impact the validity. For one, it is not known if either waitress disclosed information about the investigation to the customers.

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6 Perhaps the waitress explained the happy face on checks. Also, the demographics (socioeconomic status) of the customer population are minimally known, only from an assumption that is concluded based on the fact that the restaurant is upscale and on a university campus. Additionally, it is not known if customers who left a smaller tip were unhappy with their dining experience prior to receiving a check due to other restaurant influences. Based on assumptions, the alternate hypothesis seems to be accurate, but should be interpreted with the understanding that assumptions were made.
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