a. Construct a 98% confidence interval to estimate the difference between the average number of words understood byfirst-born andlater-born one-year-old children.

The 98% confidence interval is?

b. What conclusions can be made about the difference between the twopopulations?

With 98% confidence, it can be said that the difference in the average number of words understood falls within/does not fall within the endpoints of the confidence interval. The fact that this interval includes/does not include zero provides evidence that there is not/is a significant difference between the two populations.

c. What assumptions need to be made in order to perform thisprocedure?

A.

Although the sample size in the first sample is largeenough, it must be assumed that the distribution for the second sample is normally distributed.

B.

It must be assumed that the distribution for both populations are normally distributed. It must also be assumed that the samples are independent.

This is the correct answer.

C.

Since the sample sizes are largeenough, no assumptions are needed.

D.

Although the sample size in the second sample is largeenough, it must be assumed that the distribution for the first sample is normally distributed.

Chrome - Do Homework - Duaa Ashkar X mathxl.com/Student/PlayerHomework.aspx?homeworkld=5811 10041&questionld=4&flushed=true&cld=61 39192&centerwin=yes Business Statistics - BUS 3700-01 Duaa Ashkar & | 10/07/20 10:16 PM Homework: Chapter 10 Save Score: 0.83 of 5 pts 8 of 16 (15 complete) HW Score: 73.98%, 59.18 of 80 pts x 10.2.22-T Question Help The following table shows the average number of words understood by later-born and first-born one-year-old children from two random samples. Assume the population variances of the number of words understood are equal. Use the table to complete parts a through c. Later-Born First-Born Sample mean 432.4 554.0 Sample standard deviation 133.4 130.2 Sample size 13 13 a. Construct a 98% confidence interval to estimate the difference between the average number of words understood by first-born and later-born one-year-old children. The 98% confidence interval is (][D) Round to two decimal places as needed.) Enter your answer in the edit fields and then click Check Answer. (? 2 parts Clear All Check Answer remaining M 4 10:16