Logo
Home Study Material Contact Search
AI Chat FREE
  1. mathematics
  2. statistics
  3. every few years, the national assessment of educat

Every few years, the National Assessment of Educational Progress asks a national sample of eighth-graders to...

90.2K

Verified Solution

Question

Statistics

Every few years, the National Assessment of Educational Progressasks a national sample of eighth-graders to perform the same mathtasks. The goal is to get an honest picture of progress in math.Suppose these are the last few national mean scores, on a scale of0 to 500

. Year 1990 1992 1996 2000 2003 2005 2008 2011 2013

Score 263 266 272 273 277 278 280 286 288

(a) Make a time plot of the mean scores, by hand. This is just ascatterplot of score against year. There is a slow linearincreasing trend.

(b) Find the regression line of mean score on time step-by-step.First calculate the mean and standard deviation of each variableand their correlation (use a calculator with these functions). Thenfind the equation of the least-squares line from these. (Round youranswers to two decimal places.)
ŷ =   +   x

Draw the line on your scatterplot. What percent of theyear-to-year variation in scores is explained by the linear trend?(Round your answer to one decimal place.)
  %

Answer & Explanation Solved by verified expert
3.7 Ratings (682 Votes)
    See Answer
Get Answers to Unlimited Questions

Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!

Membership Benefits:
  • Unlimited Question Access with detailed Answers
  • Zin AI - 3 Million Words
  • 10 Dall-E 3 Images
  • 20 Plot Generations
  • Conversation with Dialogue Memory
  • No Ads, Ever!
  • Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!
Become a Member

Other questions asked by students

Algebra
1.2K views

When the number 1 is written as an exponential expression with a base of 4,...

Advance Math
1.2K views

Find two power series solutions of the following differential equations. y'' - xy' = 0

Mechanical Engineering
1.2K views

examine the structure of the materials management processes for these types of items. Specifically, address the...

Psychology
1.2K views

Sociology and Anthropology chapter 5 1.What are the four different kinds of groups & differentiate each 2.No man...

General Management
1.2K views

Most people associate the term diversity with the word cultural, but diversity is not just cultural....

Biology
1.2K views

EXTRA CREDIT QUESTION Describe how the bottleneck effect can cause a population s allele fequencies...

Physics
1.2K views

In the arrangement shown the pulley and the strings are ideal The acceleration of block...

Basic Math
1.2K views

Suppose that after a company introduces a new product, the number of months before its...

Accounting
1.2K views

Analyzing Shareholders Equity Presented below is the consolidated statement of shareholders equity for The Johnson...

Accounting
1.2K views

pls solve this question, using 2022 - 1040 Form (pls solve it by yourself, other...

Accounting
1.2K views

It is April 2024 and Kevin Dean has asked you to help him with his...

Finance
1.2K views

What is the Macaulay duration in years of a 7% coupon bond with 2 years...