Question

1. Two samples are taken with the following numbers of successes and sample sizes
r1r1 = 32 r2r2 = 30
n1n1 = 68 n2n2 = 92

Find a 88% confidence interval, round answers to the nearest thousandth.
< p1−p2 <

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity

Box 2: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity

2.

Two samples are taken with the following sample means, sizes, and standard deviations
¯x1x¯1 = 33 ¯x2x¯2 = 24
n1n1 = 57 n2n2 = 73
s1s1 = 3 s2s2 = 4

Estimate the difference in population means using a 90% confidence level. Use a calculator, and do NOT pool the sample variances. Round answers to the nearest hundredth.
< μ1-μ2 <

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity

Box 2: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity

Please explain how to get the answer using a calculator thank you. There is 2 questions because is the third time I have had to post this question because the answer was wrong.

Answer 1

Solution-1:

use TI*3 calculator

TESTS>2-PropZINT

From output:

88% confidence interval for p1-p2 is

0.024,0.265

Solution-2:

From output:

90% confidence interval for mu1-mu2 is

7.98 < μ1-μ2 <10.02