Unit C, Exercise C.018 Restaurant Tips This question refers to the dataset Resta
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Question
Unit C, Exercise C.018 Restaurant Tips
This question refers to the dataset RestaurantTips. The data include information from a sample of 157 restaurant bills collected at the First Crush bistro.
Click here for the dataset associated with this question.
Table 1 gives summary statistics for the tip percentage based on whether or not a credit card was used.
Table 1 Summary statistics for tip percent by method of payment
1)In the sample, which method of payment has a larger average tip percent? Cash, or Credit or Debit, or neither
2)Which method has more variability? Cash, or Credit or Debit, or neither
3)Is there evidence of a difference in mean tip percentage depending on the method of payment? Yes or NO
Credit? Sample Size Mean Std. Dev. Yes 51 17.10 2.47 No 106 16.39 5.05Explanation / Answer
Result:
Unit C, Exercise C.018 Restaurant Tips
This question refers to the dataset RestaurantTips. The data include information from a sample of 157 restaurant bills collected at the First Crush bistro.
Click here for the dataset associated with this question.
Table 1 gives summary statistics for the tip percentage based on whether or not a credit card was used.
Credit?
Sample Size
Mean
Std. Dev.
Yes
51
17.10
2.47
No
106
16.39
5.05
Table 1 Summary statistics for tip percent by method of payment
1)In the sample, which method of payment has a larger average tip percent?
Credit
2)Which method has more variability?
Cash
3)Is there evidence of a difference in mean tip percentage depending on the method of payment?
NO
Pooled-Variance t Test for the Difference Between Two Means
(assumes equal population variances)
Data
Hypothesized Difference
0
Level of Significance
0.05
Population 1 Sample
Sample Size
51
Sample Mean
17.1
Sample Standard Deviation
2.47
Population 2 Sample
Sample Size
106
Sample Mean
16.39
Sample Standard Deviation
5.05
Intermediate Calculations
Population 1 Sample Degrees of Freedom
50
Population 2 Sample Degrees of Freedom
105
Total Degrees of Freedom
155
Pooled Variance
19.2439
Standard Error
0.7476
Difference in Sample Means
0.7100
t Test Statistic
0.9497
Two-Tail Test
Lower Critical Value
-1.9754
Upper Critical Value
1.9754
p-Value
0.3437
Do not reject the null hypothesis
Credit?
Sample Size
Mean
Std. Dev.
Yes
51
17.10
2.47
No
106
16.39
5.05
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