1. The table contains prices from two companies, one on the east coast and one on the west coast, for specific fish types. Find a 90% confidence interval for the mean difference in wholesale price between the east coast and west coast suppliers. Round to two decimal places. Wholesale Prices of Fish in Dollars

Fish	East Coast	West Coast
Cod	17.99	23.99
Tilapia	7	12
Farmed Salmon	18.99	20.99
Organic Salmon	22.99	28.99
Grouper Fillet	30.99	35.99
Tuna	26.99	33.99
Swordfish	21.99	23.99
Sea Bass	35.99	39.99
Striped Bass	29.99	29.99

With 90% confidence, it can be said that the true mean difference in wholesale price between the east coast and west coast suppliers is between $????? and $??????.

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2. To determine if Reiki is an effective method for treating pain, a pilot study was carried out where a certified second-degree Reiki therapist provided treatment on volunteers. Pain was measured using a visual analogue scale (VAS) immediately before and after the Reiki treatment. The data is in the table. Compute a 95% confidence level for the mean difference in VAS score from before and after Reiki treatment. Round to three decimal places. Pain Measures Before and After Reiki Treatment

VAS before	VAS after
5	6
4	4
1	0
1	1
8	3
9	10
3	4
6	7
5	3
9	2
7	0
8	2
6	7
5	5
9	3
3	2
2	1
7	8
8	3
2	2

With 95% confidence, it can be said that the mean difference in VAS score from before and after Reiki treatment is between ????? and ?????

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3. The cholesterol level of patients who had heart attacks was measured two days after the heart attack and then again four days after the heart attack. The researchers want to see if the cholesterol level of patients who have heart attacks reduces as the time since their heart attack increases. The data is in the table. Calculate a 99% confidence interval for the mean difference in cholesterol levels from day two to day four. Round to two decimal places. Cholesterol Levels (in mg/dL) of Heart Attack Patients

Patient	Cholesterol Level Day 2	Cholesterol Level Day 4
1	265	246
2	195	173
3	231	238
4	257	280
5	240	265
6	249	263
7	245	223
8	190	177
9	245	221
10	215	220
11	356	351
12	316	284
13	180	195
14	239	205
15	212	210
16	240	249
17	239	216
18	187	170
19	230	211
20	275	241
21	286	289
22	318	320
23	190	194
24	211	196
25	272	288
26	283	287
27	214	212
28	328	333

With 99% confidence, it can be said that the true mean difference in cholesterol levels is between ???? and ???? mg/dL.

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4. The number of cell phones per 100 residents in countries in Europe is given in the first table. The number of cell phones per 100 residents in countries of the Americas is given in the second table. Find the 95% confidence interval for the difference in mean number of cell phones per 100 residents in Europe and the Americas. Round to the nearest whole number. Number of Cell Phones per 100 Residents in Europe

100

106

93

149

84

101

118

62

119

54

134

105

117

99

74

109

116

99

54

111

133

61

82

140

95

113

48

114

101

71

37

86

100

99

126

71

102

120

98

65

94

53

118

101

116

51

41

75

118

162

98

90

106

With 95% confidence, it can be said that the difference in mean number of cell phones per 100 residents in Europe and the Americas is between ???? and ????.

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5.