Confidence Intervals In this week’s reading, we discussed different types of samples, their distributions, sampling errors, probabilities, and confidence intervals. Using the appropriate support tool,...

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Confidence Intervals


In this week’s reading, we discussed different types of samples, their distributions, sampling errors, probabilities, and confidence intervals. Using the appropriate support tool, sequence, and equations, complete
Problem 33 in Chapter 8 on page 351.



Problem 8-33.You have been assigned to determine whether more people prefer Coke or Pepsi. Assume that roughly half the population prefers Coke and half prefers Pepsi. How large a sample do you need to take to ensure that you can estimate, with 95% confidence, the proportion of people preferring Coke within 2% of the actual value?
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Answered Same DayDec 26, 2021

Answer To: Confidence Intervals In this week’s reading, we discussed different types of samples, their...

David answered on Dec 26 2021
108 Votes
Given that the sample proportion is p^=0.50 (approximately half of the population prefers Coke
ad
half of the population prefers Pepsi), error (E) = 0.02 and the level of confidence=95% that is
z(0.05)=1.96
Now, the required sample size is computed using the following formula:...
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