Textbook ExpertVerified Tutor
17 Dec 2021
Given information
Previous confidence interval = 90%
Required confidence interval = 98%
Step-by-step explanation
Step 1.
The sample size should increase.
As we increase the size of sample our estimated value get away from population parameter and our confidence that the required value is correct increases. This is because increase in sample size implies increase in standard error or margin of error. If we look on the formula of margin of error n comes in the denominator and as the denominator increases the value of whole fraction increases. If margin of error increases which means area of confidence increases which implies increase in confidence level.
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