# Two random samples are selected from two independent populations. A summary of the sample sizes, sample

Two random samples are selected from two independent populations. A summary of the sample sizes, sample means, and sample standard deviations is given below: n1=42,n2=49,x¯1=53.5,x¯2=74.4,s1=7s 2=13.7 Find a 80% confidence interval for the difference µ1−µ2 of the means, assuming unequal population variances. -23.77 <µ1−µ2< 23.774

## This Post Has 4 Comments

1. Expert says:

stay frosty!

2. Expert says:

idk wbu

step-by-step explanation:

3. Expert says:

2(10 - 13x) + 9x = -34x + 6020 - 26x + 9x = -34x + distributive property-17x = -34x + subtraction property (subtracted 20 from both sides)17x = addition property (added 34x to both sides)x = 40/ division property (divided both sides by 17)

4. Expert says:

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.