Question 37 Mrs. Jones wanted to compare her students' math scores on two tests, each of which had 40 items. She found that for Test A, the mean was 20 and the standard deviation was 4, and for Test B, the mean was also 20, but the standard deviation was 6. Which of the following statements is true?
a.The distribution of scores for Test B is positively skewed.
b.The scores for both tests are normally distributed.
c.There is more variation in the distribution of the scores for Test B than in Test A.
d.The standard error is the same for both tests because they both tests have 40 items.
Question 37 Mrs. Jones wanted to compare her students' math scores on two tests, each of...
A researcher wanted to see if live reggae music improved students’ math test scores. He selected a sample of 61 students from his university and gave them a math test. The students then studied for two and a half hours while an acoustic reggae band played quietly. The students then took another math test of the same difficulty. The researcher’s variable was the change in test score for each student — a positive change meant the student did better, while...
Eleanor scores 680 on the mathematics part of the SAT. The distribution of SAT math scores in recent years has been Normal with mean 563 and standard deviation 111. Gerald takes the ACT Assessment mathematics test and scores 27. ACT math scores are Normally distributed with mean 22.7 and standard deviation 2.1. a. What is Elanor's standardized score? Round to 2 decimal places. b. What is Gerald's standardized score? Round to 2 decimal places. c. Assuming that both tests measure...
ACT, Inc., the producer of the ACT test of readiness for college work, also produces tests for 8th and 9th grade students designed to help them to plan for the future. Two of these tests measure reading and mathematics achievement. Each has scores that range from 1 to 25. For students tested in the fall of their 8th grade year, the reading test has mean 13.9 and standard deviation 3.63. The mean score on the math test is 14.4 and...
Two placement exams are available that students can take to determine which math class they should begin with in their freshman ye. It is believed that there is no difference in the mean scores that would be received for the two tests. To test this using a 0.05 level of significance, a randomly selected group of students took both tests and had their scores recorded the following data were obtained Student Test A Test B 1 78 2 74 3...
QUESTION 3 Math SAT Question 3 The scores of men on the math SAT follow a Normal distribution so do those of women. It is reasonable to assume that the standard deviations of the two sets of scores are equal. Let us (respectively, u2) denote the average math SAT score of men (respectively, women). A random sample of 20 men was selected. The average math SAT score of the men selected was 607.8 with a standard deviation of 48.76. Another...
The math achievements scores of two groups, each with 20 students, were compared. The degrees of freedom for the t-test would be: 40 18 42 38 As part of a study of the effect of zombie shows on the walking style of adolescents, researchers measured the gait of 100 subjects (using the ZombieTron 6000) before and after watching a 6 hour Walking Dead marathon. They wanted to see if the adolescents incorporated more “zombie” elements into their gait after this...
please answer all parts
106. Eleanor scores 680 on the mathematics part of the SAT. The distribution of SAT math scores in recent years has been Normal with mean 504 and standard deviation Gerald takes the ACT Assessment mathematics test and scores 27. ACT math scores are Normally distributed with mean 23.8 and standard deviation 3.8 a. What is Elanor's standardized score? b. What is Gerald's standardized score? c. Assuming that both tests measure the same kind of ability, who...
Help with #9 please!
QUESTION 9 From a sample of size 100, the following descriptive measures were calculated: median 23, mean 20, standard deviation 5, range 35; seventy-five- sample values are between 10 and 30; and ninety-nine sample values are between 5 and 35. If you knew the sample mean, median, and standard deviation were correct, which one of the following conclusions might you draw? O A.The distribution is skewed to the right because the median exceeds the mean. B.The...
#3 One of the most common ways of measuring intelligence is the IQ test. IQ scores in the US population have an average of µ = 100 and a standard deviation of σ = 15. Suppose a researcher wanted to test whether socioeconomic status (SES) has an effect on IQ scores. The researcher takes a random sample of n = 100 people, selected from a list of the 1000 richest people in the United States. a. Based on this information,...
QUESTION 1 The normal curve is particularly useful as a model for a. data in which mean and median differ b. many populations of psychological and educational data c. distributions of sample statistics d. both (b) and (c) above QUESTION 2 A distribution has a mean of 60 and a standard deviation of 8. For a score of 72, the equivalent z score a. is +1.5 b. is between 0 and +1.0 c. is + 1.2 d. cannot be determined...