Assume that a sample is used to estimate a population mean u. Find the 80% confidence interval for a sample of μ. size 40 with a mean of 68.2 and a standard deviation of 12.1. Enter your answer as an open-interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). 80% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

MATLAB: An Introduction with Applications
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Assume that a sample is used to estimate a population
mean u. Find the 80% confidence interval for a sample of
μ.
size 40 with a mean of 68.2 and a standard deviation of
12.1. Enter your answer as an open-interval (i.e.,
parentheses) accurate to one decimal place (because the
sample statistics are reported accurate to one decimal
place).
80% C.I. =
Answer should be obtained without any preliminary
rounding. However, the critical value may be rounded to 3
decimal places.
Transcribed Image Text:Assume that a sample is used to estimate a population mean u. Find the 80% confidence interval for a sample of μ. size 40 with a mean of 68.2 and a standard deviation of 12.1. Enter your answer as an open-interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). 80% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.
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