Question

Assume that a sample is used to estimate a population mean µ. Find the 95% confidence interval for a sample of size 65 with a mean of 20.3 and a standard deviation of 18.5. 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). 95% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

          Assume that a sample is used to estimate a population mean µ. Find the 95% confidence interval for a sample of size 65 with a mean of 20.3 and a standard deviation of 18.5. 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).
95% C.I. =
Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Assume that a sample is used to estimate a population mean µ. Find the 95% confidence interval for a sample of size 65 with a mean of 20.3 and a standard deviation of 18.5. 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).
95% C.I. =
Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Added by Joanne M.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Robin Corrigan

05/21/2023

Step 1

To find the critical value for a 95% confidence interval, we need to look up the z-score associated with a 95% confidence level. Since the sample size is large (n > 30), we can use the standard normal distribution. The z-score for a 95% confidence level is Show more…

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Assume that a sample is used to estimate a population mean .Find the 95% confidence interval for a sample of size 65 with a mean of 20.3 and a standard deviation of 18.5.Enter your answer as an open interval (i.e.,parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimalplace). 95%C.1. Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to3.decimal places.