Solutions Statistics

Solution) Suppose you want to test on average graduate students want to weigh less than they are. How many stu

Question: Suppose you want to test on average graduate students want to weigh less than they are. How many students would you sample so that you can get a power of 0.80 if the minimum detectable difference is 1 lbs and a=0.05? (a. Pay attention to how to estimate the sample standard deviation, is the data paired or independent? b. Is this a one-tailed or a two-tailed test?)

Weight	Ideal-weight
180	136
108	115
114	110
180	170
140	119
155	145
145	135
104	100
108	99
120	120
120	140
110	110
115	100
118	110
155	155
165	160
132	120
200	185
150	150
125	120
114	105
165	147
218	216
200	180
153	145
170	125
126	110
160	171
101	106
140	150
178	170
160	180
113	105
130	120
175	175
155	140
145	135
170	140
135	132
110	100
130	*
170	160
140	130
132	122