Question

A business school placement director wants to estimate the mean annual salaries 5 years after students graduate. A random sample of 15 such graduates found a sample mean of $42,740 and a sample standard deviation of $4,780. (a) Find the UCL and LCL of a 98% confidence interval for the population mean, assuming that the population distribution is normal. (b) What is the LCL? (answer in two decimal places) What is the UCL? (answer in two decimal places)

Name: a business school placement director wants to estimate the mean annual salaries 5 years after students graduate a random sample of 15 such graduates found a sample mean of 42740 and a sample 14249
Uploaded: 2022-02-11T06:53:46-08:00
Duration: 2 min 15 s
Channel: Lakshya H
Description: a business school placement director wants to estimate the mean annual salaries 5 years after students graduate a random sample of 15 such graduates found a sample mean of 42740 and a sample 14249

          A business school placement director wants to estimate the mean
annual salaries 5 years after students graduate. A random sample of
15 such graduates found a sample mean of $42,740 and a sample
standard deviation of $4,780.
(a) Find the UCL and LCL of a 98% confidence interval for the
population mean, assuming that the population distribution is
normal.
(b) What is the LCL? (answer in two decimal places)
What is the UCL? (answer in two decimal places)

Added by Heather L.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Lakshya H

02/11/2022

Step 1

C) using a t-table with 14 degrees of freedom and a significance level of 0.01 on each side. Show more…

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A business school placement director wants to estimate the mean annual salaries 5 years after students graduate. A random sample of 15 such graduates found a sample mean of $42,740 and a sample standard deviation of $4,780. (a) Find the UCL and LCL of a 98% confidence interval for the population mean, assuming that the population distribution is normal. (b) What is the LCL? (answer in two decimal places) What is the UCL? (answer in two decimal places)