A marketing firm is doing research for an Internet-based company. It wants to appeal to the age group of people who spend the most money online. The company wants to know if there is a difference in the mean amount of money people spend per month on Internet purchases depending on their age bracket. The marketing firm looked at two age groups, 18-24 years and 25-30 years, and collected the data shown in the following table. Let Population 1 be the amount of money spent per month on Internet purchases by people in the 18-24 age bracket and Population 2 be the amount of money spent per month on Internet purchases by people in the 25-30 age bracket. Assume that the population variances are not the same. Internet Spending per Month 18-24 Years 25-30 Years Mean Amount Spent 55.19 65.24 Standard Deviation 11.39 13.68 Sample Size 21 25 Step 2 of 2: Interpret the confidence interval (- 16.43, – 3.67) obtained in Step 1. Answer E Tables в Кеурad Keyboard Shortcut Since the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 90% confidence level. We are 90% confident that the mean amount of money spent on Internet purchases for ages 18-24 years is between $3.67 and $16.43 more than the mean amount of money spent on Internet purchases for ages 25-30 years. Since the confidence interval does not contain zero, the data do not provide evidence that the population means are unequal at a 90 % confidence level. We are 90% confident that the mean amount of money spent on Internet purchases for ages 18-24 years is between $3.67 and $16.43 less than the mean amount of money spent on Internet purchases for ages 25-30 years.
A marketing firm is doing research for an Internet-based company. It wants to appeal to the age group of people who spend the most money online. The company wants to know if there is a difference in the mean amount of money people spend per month on Internet purchases depending on their age bracket. The marketing firm looked at two age groups, 18-24 years and 25-30 years, and collected the data shown in the following table. Let Population 1 be the amount of money spent per month on Internet purchases by people in the 18-24 age bracket and Population 2 be the amount of money spent per month on Internet purchases by people in the 25-30 age bracket. Assume that the population variances are not the same. Internet Spending per Month 18-24 Years 25-30 Years Mean Amount Spent 55.19 65.24 Standard Deviation 11.39 13.68 Sample Size 21 25 Step 2 of 2: Interpret the confidence interval (- 16.43, – 3.67) obtained in Step 1. Answer E Tables в Кеурad Keyboard Shortcut Since the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 90% confidence level. We are 90% confident that the mean amount of money spent on Internet purchases for ages 18-24 years is between $3.67 and $16.43 more than the mean amount of money spent on Internet purchases for ages 25-30 years. Since the confidence interval does not contain zero, the data do not provide evidence that the population means are unequal at a 90 % confidence level. We are 90% confident that the mean amount of money spent on Internet purchases for ages 18-24 years is between $3.67 and $16.43 less than the mean amount of money spent on Internet purchases for ages 25-30 years.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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Transcribed Image Text:A marketing firm is doing research for an Internet-based company. It wants to appeal to the age group of people who spend the
most money online. The company wants to know if there is a difference in the mean amount of money people spend per month on
Internet purchases depending on their age bracket. The marketing firm looked at two age groups, 18-24 years and 25-30 years, and
collected the data shown in the following table. Let Population 1 be the amount of money spent per month on Internet purchases by
people in the 18-24 age bracket and Population 2 be the amount of money spent per month on Internet purchases by people in the
25-30 age bracket. Assume that the population variances are not the same.
Internet Spending per Month
18-24 Years
25-30 Years
Mean Amount Spent
55.19
65.24
Standard Deviation
11.39
13.68
Sample Size
21
25
Step 2 of 2: Interpret the confidence interval (–16.43, – 3.67) obtained in Step 1.
Answer
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Since the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 90%
confidence level.
We are 90% confident that the mean amount of money spent on Internet purchases for ages 18-24 years is between $3.67 and
$16.43 more than the mean amount of money spent on Internet purchases for ages 25-30 years.
Since the confidence interval does not contain zero, the data do not provide evidence that the population means are unequal at a
90 % confidence level.
We are 90% confident that the mean amount of money spent on Internet purchases for ages 18-24 years is between $3.67 and
$16.43 less than the mean amount of money spent on Internet purchases for ages 25-30 years.
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