你预期平均晚餐主菜项目单独定价会怎样？1.567 339. 118美元0.83529 - 0.2131美元1.8837美元
平均值为18.8353，接近18，但标准偏差会影响平均值的稳定性，这是不够的。幸运的是，这一个样本的平均差异值为0.83529，P值为0.118，1.567and T值，大于0.05的临界值，表明从18差异不显著。同时，差异的95%置信区间，其范围从-0.2131 1.8837，包括零。零假设不能被拒绝，样本均值等于给定值。
This report is aimed to provide a report about whether it is suitable to open a fine and upscale restaurant which serves delicate dishes, beverages and other snacks with the setting of the restaurant being elegant. From this point, the report deals with the possible patron rate of the restaurant, the potential customer group, potential customers’ preference of the kind of the foods, entertainment style, together withadvertising channels and so on.The data is supplied information from 400 questionnaires. The report will be focused on 10 key problems concerning the normal operation and the serving target of the restaurant.
2. Potential Payment for the Entrees
Potential payment per entrees could offer a general view of the customers’ demand, willingness, and level of food with relative cost the restaurant could provide.
According to the forecasting model of the research firm, the preferable average payment for an a la carte entrée is $18. It is useful to use one-sample test to compare the mean of the data from answers to a known value. The method is suitable when the data only concerns one sample and the population variance is obviously unknown, as well as the dependent variable is normally distributed.
In this dataset, the variable of average payment is positively skewed according to the histogram below. However, the data is almost normally distributed around the average of 18 and the dots are nearly linked as a line around the benchmark line, therefore the variable could be regarded as normally distributed and the one-sample t-test on it could proceed.
Here, the null hypothesis is that the average entrée payment is $18 and the alternative hypothesis is that the payment is not equal to $18. Using SPSS, the resultof the one-sample t-test is displayed as follows.
N Mean Std. Deviation Std. Error Mean
What would you expect an average evening meal entree item alone to be priced? 340 $18.8353 $9.82784 $0.53299
Test Value = 18
t df Sig. (2-tailed) Mean Difference 95% Confidence Interval of the Difference
What would you expect an average evening meal entree item alone to be priced? 1.567 339 .118 $0.83529 -$0.2131 $1.8837
The mean value is 18.8353, which is close to 18, but this is not enough as the standard deviation will influence the stability of the mean value. Fortunately, the mean difference value of the one-sample test is 0.83529, and the t value of 1.567and p value of 0.118, which is greater than the critical value of 0.05, indicates that the difference from 18 is not significant. Also, the 95% Confidence Interval of the Difference, which ranges from -0.2131 to 1.8837, includes zero. The null hypothesis could not be rejected and that the sample mean is equal to the given value.