Question

Consider the following results for two independent random samples taken from two populations.

Sample 1	Sample 2
n 1 = 40	n 2 = 35
x 1 = 13.8	x 2 = 11.3
σ 1 = 2.5	σ 2 = 3

1. What is the point estimate of the difference between the two population means? (to 1 decimal)
2. Provide a 90% confidence interval for the difference between the two population means (to 2 decimals). Use z-table.
   ( , )
3. Provide a 95% confidence interval for the difference between the two population means (to 2 decimals). Use z-table. If your answer is negative, enter minus (-) sign.
   ( , )

Answer 1

40 X-13.8 6, 2.5, D2-35 63 3 Point cshinake the diggccence betwees two popuabon eans C 2 5 90 Canfedenc inkovel C- E 2 E o-T0 622 32 35 1-645 2.2 1.06 C- - E (×- )ナヒ-(13.g-1ノ-3) ナ/.0ぐ - C13.8-11-3) - /.06 2 3-56 Cofielence inteval 1-44 90 1 3.56 951 Canfidence G,2 7 Zo g5 E C2-532 1-96 1 40 35 1. 96 95 1. Can gelence inreval 2.5-. 26 S < 2.51. 26 3. 76 .24 <

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