# Question: X1 468 3 s1 38 2 n1 6 x2

x1 = 468.3, s1 = 38.2, n1 = 6, x2 = 394.6, s2 = 84.7, n2 = 14

We have provided summary statistics for independent simple random samples from two populations. Preliminary data analyses indicate that the variable under consideration is normally distributed on each population. Decide, in each case, whether use of the pooled t-test and pooled t-interval procedure is reasonable. Explain your answer.

We have provided summary statistics for independent simple random samples from two populations. Preliminary data analyses indicate that the variable under consideration is normally distributed on each population. Decide, in each case, whether use of the pooled t-test and pooled t-interval procedure is reasonable. Explain your answer.

## Answer to relevant Questions

Consider the quantities μ1, σ1, x1, s1, μ2, σ2, x2, and s2. a. Which quantities represent parameters and which represent statistics? b. Which quantities are fixed numbers and which are variables? x1 = 20, s1 = 4, n1 = 10, x2 = 23, s2 = 5, n2 = 15 a. Left-tailed test, α = 0.05 b. 90% confidence interval We have provided summary statistics for independent simple random samples from two populations. In each case, use ...Data on household vehicle miles of travel (VMT) are compiled annually by the Federal Highway Administration and are published in National Household Travel Survey, Summary of Travel Trends. Independent random samples of 15 ...Why do you need to know the sampling distribution of the difference between two sample means in order to perform a hypothesis test to compare two population means? If the assumptions for a pooled t-interval are satisfied, the formula for a (1 − α)-level upper confidence bound for the difference, μ1 − μ2, between two population means is For a left-tailed hypothesis test at the ...Post your question