Answer:
The 80% confidence interval is
Step-by-step explanation:
From the question we are told that
The sample size is n = 23
The sample mean is
The standard deviation is
From the question we are told the confidence level is 80% , hence the level of significance is
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Generally from the normal distribution table the critical value of is
Generally the margin of error is mathematically represented as
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Generally 80% confidence interval is mathematically represented as
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