Question

Boys and girls: The National Health Statistics Reports reported that a sample of 320 one-year-old boys had a mean weight of 25.3 pounds with a standard deviation of 3.4 pounds. In addition, a sample of 294 one-year-old girls had a mean weight of 24.0 pounds with a standard deviation of 3.8 pounds. Part: 0/2 Part 1 of 2 Construct a 99.5% confidence interval for the difference between the mean weights. Let u, denote the mean weight of one- year-old boys. Use the TI-84 plus calculator and round the answers to one decimal place. A 99.5% confidence interval for the difference between the mean weights is <u, -un

Answer 1

Answer: 0.5 <
μl – μ2
   < 2.1

Explanation:

$\bar x1$= 25.3, $\bar x2$ =24,

s1= 3.4, s2= 3.8

n1= 320, n2= 294

we are using TI-84 calculator to get 99.5%

steps are as follows

1) press buton STAT

2) navigate to TEST using LEFT ARROW key

3) scroll down to 2-Sample T Inerval and pree ENTER

4) now insert values as follows and click on CALCULATE

SUXI XHT NXNEXO NUTO NuNW-N3 LANGUAT RO: 0 AG

2-ŞampTInt || LIKட்ப DO I NXNEU PION-NUS пн он C-Level: .995 ed: No Yes Calculate

5) we get answer as follows

LUXIXILAT XXN ++; N = || LILLO IIIIԴԻԱ WWACHET I NU OA W WA 81332.1187

0.5 <
μl – μ2
   < 2.1