May be skewed do to more men were apart of the research than women
157 men vs. 87 women
8.
SAMPLE HYPOTHESIS TESTS hyp value sample mean stdev sample size for the mean REF =average() =stdev() =(n) NULL : Null statement ALTERNATIVE: Alternative statement test statistic (obs) =standardize(sample mean, ref value, std error(stdev/sqrt(n)) critical measure =normsinv(1-signif level/#tails) one-tailed or two-tailed? 1 |OBS| > CRIT? p-value =(#tails)*(normsidst(abs(obs))) -level 0.050 p-value < -level?
9.
HYPOTHESIS TESTS hypothesized value sample mean stdev sample size for the mean 3.00 3.09 1.49 157 NULL : Men are better tippers than women ALTERNATIVE: Men are not better tippers than women test statistic (obs) .7540843 critical measure 1.6448535 one-tailed or two-tailed? 1 |OBS| > CRIT? no p-value 0.225 -level 0.050 p-value < -level? no ACCEPT THE NULL
12.
HYPOTHESIS TESTS hypothesized value sample mean stdev sample size for the mean 3.00 3.10 1.44 176 NULL : people tip more than the average tip at dinner time ALTERNATIVE: people tip less than the average tip at dinner time test statistic (obs) 0.94836 critical measure 1.64485 one-tailed or two-tailed? 1 |OBS| > CRIT? no p-value 0.171 -level 0.050 p-value < -level? no ACCEPT THE NULL
Have servers alternate from lunch and dinner shifts so there is more opportunity for equal tip earnings.
Because average total bills tend to be larger on weekends equaling larger tips, also alternate days of week that servers work for opportunity to earn equal tips.
Add gratuity to the bottom line or explain that gratuity is not included.
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