Business, 05.02.2020 21:48 liyahhhbandz

Every few years, the national assessment of educational progress asks a national sample of eighth-graders to perform the same math tasks. the goal is to get an honest picture of progress in math.
suppose these are the last few national mean scores, on a scale of 0 to 500.

year: 1990 1992 1996 2000 2003 2005 2008 2011 2013
score: 265 266 270 271 276 277 279 287 289

(a) make a time plot of the mean scores, by hand. this is just a scatterplot of score against year. there is a slow linear increasing trend.
(b) find the regression line of mean score on time step-by-step.
first, calculate the mean and standard deviation of each variable and their correlation (use a calculator with these functions). then find the equation of the least-squares line from these. (round your answers to two decimal places.) draw the line on your scatterplot.

Answers: 3

Show answers

Another question on Business

Business, 22.06.2019 15:40

Aprice control is: question 1 options: a)a tax on the sale of a good that controls the market price.b)an upper limit on the quantity of some good that can be bought or sold.c)a legal restriction on how high or low a price in a market may go.d)control of the price of a good by the firm that produces it.

Answers: 1

Answer

Business, 22.06.2019 17:30

Danielle enjoys working as a certified public accountant (cpa) and assisting small businesses and individuals with managing their finances and taxes. which general area of accounting is her specialty? danielle specialized in

Answers: 1

Answer

Business, 22.06.2019 20:00

Qwest airlines has implemented a program to recycle all plastic drink cups used on their aircraft. their goal is to generate $7 million by the end of the recycle program's five-year life. each recycled cup can be sold for $0.005 (1/2 cent). a. how many cups must be recycled annually to meet this goal? assume uniform annual plastic cup usage and a 0% interest rate. b. repeat part (a) when the annual interest rate is 12%. c. why is the answer to part (b) less than the answer to part (a)?

Answers: 1

Answer

Business, 23.06.2019 08:30

The hypothetical country of eurica is experiencing severe competition to its domestic auto industry in the form of foreign imports. many jobs are threatened. eurica places a 25 percent tariff on the price of imported cars. this type of tariff is known as a(n) tariff.

Answers: 1

Answer

You know the right answer?

Every few years, the national assessment of educational progress asks a national sample of eighth-gr...

Questions