Independent random samples were selected from two quantitative populations, with sample sizes, means, and variances given below. Population 1 2 Sample Size 39 43 Sample Mean 9.3 7.3 Sample Variance 8.74 14.42 Construct a 90% confidence interval for the difference in the population means. (Use ?1 − ?2. Round your answers to two decimal places.) to Construct a 99% confidence interval for the difference in the population means. (Round your answers to two decimal places.) to

Independent random samples were selected from two quantitative populations, with sample sizes, means, and variances given below. Population 1 2 Sample Size 39 43 Sample Mean 9.3 7.3 Sample Variance 8.74 14.42 Construct a 90% confidence interval for the difference in the population means. (Use ?1 − ?2. Round your answers to two decimal places.) to Construct a 99% confidence interval for the difference in the population means. (Round your answers to two decimal places.) to

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section4.5: Correlation And Causation

Problem 23PFA

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Question

Independent random samples were selected from two quantitative populations, with sample sizes, means, and variances given below.

	Population
	1	2
Sample Size	39	43
Sample Mean	9.3	7.3
Sample Variance	8.74	14.42

Construct a 90% confidence interval for the difference in the population means. (Use

?₁ − ?₂.

Round your answers to two decimal places.)

Construct a 99% confidence interval for the difference in the population means. (Round your answers to two decimal places.)

Definition Definition Number of subjects or observations included in a study. A large sample size typically provides more reliable results and better representation of the population. As sample size and width of confidence interval are inversely related, if the sample size is increased, the width of the confidence interval decreases.

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