a) You intend to estimate a population mean μμ with the following sample. You believe the population is normally distrib

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a) You intend to estimate a populationmean μμ with the following sample.
You believe the population is normally distributed. Find the 95%confidence interval. Enter your answer asan open-interval (i.e.,parentheses) accurate to two decimal places (because the sampledata 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.
b) You intend to estimate a populationmean μμ from the following sample.
Find the 99% confidence interval. Enter your answer as a tri-linearinequality accurate to two decimal places (because the sample dataare reported accurate to one decimal place).
< μμ <
Answer should be obtained without any preliminary rounding.However, the critical value may be rounded to 3 decimal places.
c)
Assume that a sample is used to estimate a populationmean μμ. Find the 90% confidence interval for a sample of size571 with a mean of 51.8 and a standard deviation of 20.4. Enteryour answer as a tri-linear inequality accurate to one decimalplace (because the sample statistics are reported accurate to onedecimal place).
< μμ <
Answer should be obtained without any preliminary rounding.However, the critical value may be rounded to 3 decimal places.