2a-b 2. A fifth grader takes a standardized achievement test (mean = 125, standard deviation =...
David scored 942 on a standardized achievement test. The mean test score was 850 with a standard deviation of 100. Assuming that the distribution of test scores was normal,and using Table 8.1, what percent of students scored higher than David?
The population standard deviation (σ) is 2 for a standardized achievement test that is normally distributed. Calculate the standard error of the mean if you draw a random sample of 800 test scores. Show your work for full credit.
0/2 pts Question 3 On a certain standardized test . The mean is 54 .The standard deviation is 10 .Scores are whole numbers . Connie scored 34 Find numbers a and c such that Connie scored higher than approximately 100-d' (a) percent of people who took the test. Make a continuity correction. What is 100c a? Correct Answer 101.95
0/2 pts Question 3 On a certain standardized test . The mean is 54 .The standard deviation is 10 .Scores are...
27. On a standardized test with a normal distribution, the mean was 64.3 and the standard deviation was 5.4. What is the best approximation of the percent of scores that fell between 61.6 and 75.1? 28. The mean of a normally distributed set of data is 52 and the standard deviation is 4. Approximately 95% of all the cases will lie between which measures? 29. Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days and...
Two standardized tests, test A and test B, use very different scales. Assume that in one year the distribution of scores on test A can be modeled by N(1300,250) and scores on test B can be modeled by N(15, 3). If an applicant to a university has taken test A and scored 1670 and another student has taken test B and scored 19, compare these students' scores using z-values. Which one has a higher relative score? Explain. The Z-value of...
A particular IQ test is standardized to a Normal model, with a mean of 80 and a standard deviation of 12. Using the Empirical rule determine about what percent of people should have IQ scores less than 44? The percent of people with IQ scores less than 44 is:
A particular IQ test is standardized to a Normal model, with a mean of 90 and a standard deviation of 9. Using the Empirical Rule determine about what percent of people should have IQ scores more than 108? The percent of people with IQ scores more than 108 is: Number % (Omit the percent sign)
The population mean mon a national scholastic achievement test is 100 with a standard deviation of 30. The students in Mr. Smart’s class got the following scores: 127 121 123 128 118 126 120 130 128 119 127 125 Using the criterion of 0.05 in the upper tail only, determine if Mr. Smart’s class is representative of the population. State the RESEARCH Hypothesis or H1 State the NULL Hypothesis or Ho Identify H1 as one or two-tailed Specify alpha level (level of significance) Specify Degrees of Freedom (n – 1) Identify Critical...
This Quiz: 8pts Two standardized tests, test A and test B, use very dfferent scaes Assume byN 1500, 125) and scores on teset 8 can be modeied by N(17, 2) if an applicent to a univernsity he has taken sest B and scored 24, compare these studenis' scores using z-vaiues Which one has a higher relative score? Explain The z-value ofthe test A sore isZA.□ Round to two decimal places as needed) The 2-value of the test B score is...
Scores on a standardized test are normally distributed with a mean of 100 and a standard deviation of 20. If these scores are converted to standard normal Z scores, which of the following statements will be correct?