Apsychologist is conducting a study to learn about the difference between two population means, ? 1 - ? 2 using a two-independent samples t procedure. the two sample standard deviations are s1 = 4.0 points and s2 = 3.0 points and the sample size for the group 1 was more than the sample size for group 2. which value is the only reasonable value for the pooled estimate of the common population standard deviation?

2.3 points

3.3 points

3.5 points

3.7 points

4.9 points

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Which of the following tables represents exponential functions?

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)