Katy is interested to understand the of herd immunity concept for Singapore's COVID-19 cases. She noted that 95% of adult population in Singapore is fully vaccinated by the end of October 2021. She want to compare difference of COVID-19 death cases in Singapore before Singapore achieve herd immunity and after Singapore achieve herd immunity. She collects the data of death cases in Singapore two weeks in the early of October 2021 (to represent before herd immunity) and two weeks in the end of No A (Ctrl) -21 (to represent after herd immunity). Assume the variable is approximately normally distributed. The data are presented as below. Before herd immunity After herd immunity 121 109 118 76 117 105 132 53 40 68 55 45 41 24 78 74 64 93 103 68 88 63 47 37 48 45 40 29

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Katy is interested to understand the of herd immunity concept for Singapore's COVID-19 cases. She noted that
95% of adult population in Singapore is fully vaccinated by the end of October 2021. She want to compare
difference of COVID-19 death cases in Singapore before Singapore achieve herd immunity and after Singapore
achieve herd immunity. She collects the data of death cases in Singapore two weeks in the early of October 2021
(to represent before herd immunity) and two weeks in the end of No
(Ctrl) -21 (to represent after herd
immunity). Assume the variable is approximately normally distributed. The data are presented as below.
Before herd immunity
After herd immunity
121
109
118
76
117
105
132
53
40
68
55
45
41
24
78
74
64
93
103
68
88
63
47
37
48
45
40
29
a) Find 98% confidence interval of the difference in means.
Transcribed Image Text:Katy is interested to understand the of herd immunity concept for Singapore's COVID-19 cases. She noted that 95% of adult population in Singapore is fully vaccinated by the end of October 2021. She want to compare difference of COVID-19 death cases in Singapore before Singapore achieve herd immunity and after Singapore achieve herd immunity. She collects the data of death cases in Singapore two weeks in the early of October 2021 (to represent before herd immunity) and two weeks in the end of No (Ctrl) -21 (to represent after herd immunity). Assume the variable is approximately normally distributed. The data are presented as below. Before herd immunity After herd immunity 121 109 118 76 117 105 132 53 40 68 55 45 41 24 78 74 64 93 103 68 88 63 47 37 48 45 40 29 a) Find 98% confidence interval of the difference in means.
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