Every few years, the National Assessment of Educational Progress asks a national sample of eighth-graders to...
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 | 262 | 266 | 272 | 273 | 277 | 278 | 280 | 286 | 288 |
(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. What percent of the year-to-year
variation in scores is explained by the linear trend? (Round your
answer to one decimal place.)
%
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Every few years, the National Assessment of Educational Progress
asks a national sample of eighth-graders to...
Just need help with part (b) Every few years, the National Assessment of Educational Progress asks...
Just need help with part (b)
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 263 266 271 272 278 279 281 283 285 (a) Make a time plot...
An education statistics organization reported recent average mathematics achievement scores for eighth graders in 50 regions....
An education statistics organization reported recent average
mathematics achievement scores for eighth graders in 50 regions.
Complete parts a through c below.
a) Find the median, the IQR, the sample mean, and the sample
standard deviation of these regional averages.
Region Score Region Score 270 285 277 276 270 286 291 282 281 279 274 285 283 287 284 289 279 26 290 282 272 292 294 270 282 286 293 284 274 285 290 279 278 289 275 289...
The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth-grade students. Scores on...
The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth-grade students. Scores on the test range from 0 to 500. Demonstrating the ability to use the mean to solve a problem is an example of the skills and knowledge associated with performance at the Basic level. An example of the knowledge and skills associated with the Proficient level is being able to read and interpret a stem-and-leaf plot. In 2015, 136,900 eighth-graders were in the NAEP sample...
Does anybody know what I am doing wrong? Even got the equation from Excel... Every few...
Does anybody know what I am
doing wrong? Even got the equation from Excel...
Every few years, the National Assessment of Educational Frogress asks a national sample of eighth-gracers to perform the same matn tasks. The g0 is to get an honest picture of progress in mธ廿. Suppose these are the last few national mean scores, on scale cr u to SOD. 2013 rear Score 265 200 280 285 287 (a] Make a time plot of the meer scores, by...
A random sample of 90 eighth grade students' scores on a national mathematics assessment test has...
A random sample of 90 eighth grade students' scores on a national mathematics assessment test has a mean score of 288. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 200. Assume that the population standard deviation is 37. At = 0.14 is there enough evidence to support the administrator's daim? Complete parts(a) through (e) (a) Write the calm mathematically and identity Hy and...
A random sample of 86 eighth grade students' scores on a national mathematics assessment test has...
A random sample of 86 eighth grade students' scores on a national mathematics assessment test has a mean score of 275. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 270. Assume that the population standard deviation is 33. At alpha=0.05, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). (a) Write the claim mathematically and identify H0 and...
Suppose that scores on the mathematics part of the National Assessment of Educational Progress (NAEP) test...
Suppose that scores on the mathematics part of the National Assessment of Educational Progress (NAEP) test for eighth-grade students follows a normal distribution with sd equal to 110. You want to estimate the true mean score within +/- 10 points with 90% confidence. Suppose you find out that the most you can sample is only 225 subjects. Now estimate the confidence level you could attain with n=225.
1. Properties of the normal curve The National Assessment of Educational Progress (NAEP) conducts a nationwide...
1. Properties of the normal curve The National Assessment of Educational Progress (NAEP) conducts a nationwide assessment of students' proficiency in nine subjects: mathematics, reading, writing, science, the arts, civics, economics, geography, and U.S. history. The main NAEP assessments are conducted annually on samples of students from grades 4, 8, and 12. In 2003, the mathematics scores for male students had a mean of 278 with a standard deviation of 37. Assume that these scores are normally distributed with the...
A random sample of 86 eighth grade students' scores on a national mathematics assessment test has...
A random sample of 86 eighth grade students' scores on a national mathematics assessment test has a mean score of 272. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 270. Assume that the population standard deviation is 34. At a=0.14, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). (a) Write the claim mathematically and identify H, and...
A random sample of 75 eighth grade students' scores on a national mathematics assessment test has...
A random sample of 75 eighth grade students' scores on a national mathematics assessment test has a mean score of 279. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 275. Assume that the population standard deviation is 34. At c = 0.03, is there enough evidence to support the administrator's claim? Complete parts (a) through (). (a) Write the claim mathematically and identify...
Just need help with part (b)
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 263 266 271 272 278 279 281 283 285 (a) Make a time plot...
An education statistics organization reported recent average
mathematics achievement scores for eighth graders in 50 regions.
Complete parts a through c below.
a) Find the median, the IQR, the sample mean, and the sample
standard deviation of these regional averages.
Region Score Region Score 270 285 277 276 270 286 291 282 281 279 274 285 283 287 284 289 279 26 290 282 272 292 294 270 282 286 293 284 274 285 290 279 278 289 275 289...
The National Assessment of Educational Progress (NAEP) includes a mathematics test for eighth-grade students. Scores on the test range from 0 to 500. Demonstrating the ability to use the mean to solve a problem is an example of the skills and knowledge associated with performance at the Basic level. An example of the knowledge and skills associated with the Proficient level is being able to read and interpret a stem-and-leaf plot. In 2015, 136,900 eighth-graders were in the NAEP sample...
Does anybody know what I am
doing wrong? Even got the equation from Excel...
Every few years, the National Assessment of Educational Frogress asks a national sample of eighth-gracers to perform the same matn tasks. The g0 is to get an honest picture of progress in mธ廿. Suppose these are the last few national mean scores, on scale cr u to SOD. 2013 rear Score 265 200 280 285 287 (a] Make a time plot of the meer scores, by...
A random sample of 90 eighth grade students' scores on a national mathematics assessment test has a mean score of 288. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 200. Assume that the population standard deviation is 37. At = 0.14 is there enough evidence to support the administrator's daim? Complete parts(a) through (e) (a) Write the calm mathematically and identity Hy and...
1. Properties of the normal curve The National Assessment of Educational Progress (NAEP) conducts a nationwide assessment of students' proficiency in nine subjects: mathematics, reading, writing, science, the arts, civics, economics, geography, and U.S. history. The main NAEP assessments are conducted annually on samples of students from grades 4, 8, and 12. In 2003, the mathematics scores for male students had a mean of 278 with a standard deviation of 37. Assume that these scores are normally distributed with the...
A random sample of 86 eighth grade students' scores on a national mathematics assessment test has a mean score of 272. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 270. Assume that the population standard deviation is 34. At a=0.14, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). (a) Write the claim mathematically and identify H, and...
A random sample of 75 eighth grade students' scores on a national mathematics assessment test has a mean score of 279. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 275. Assume that the population standard deviation is 34. At c = 0.03, is there enough evidence to support the administrator's claim? Complete parts (a) through (). (a) Write the claim mathematically and identify...
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