1. The raw scores on the standardized reading test are normally distributed so the raw scores...
1. The raw scores on the standardized reading test are normally distributed so the raw scores can be converted into a distribution of Z scores. If we want to mark the lower 5% of the distribution on the Z distribution, what is the Z value that is the cut-off point for that 5% tail region? (Answer with the exact Z value found from the Z table)
2. What would be the cut-off raw score if we want to mark the bottom 5% on the distribution of raw scores? The population mean of the reading scores is 100 and the standard deviation is 10. (Round the answers to two decimal places)
3. School A has 240 third-graders. How many third-graders will meet the criterion of scoring at the bottom 5% on the standardized reading test?
Homework Answers
Add Answer to:
1. The raw scores on the standardized reading test are normally
distributed so the raw scores...
Scores on a test of reading ability for second graders are normally distributed with a mean...
Scores on a test of reading ability for second graders are normally distributed with a mean of 60 and a standard deviation of 11. The principal of a school wants to identify the students who are in the top 5% of the class for participation in accelerated work in reading. What is the minimum raw score a student must have to be in the top 5% a. 65 b. 78.5 c. 66.65 d. 77.58
Raw scores on behavioral tests are often transformed for easier comparison. A test of reading ability...
Raw scores on behavioral tests are often transformed for easier comparison. A test of reading ability has mean 60 and standard deviation 10 when given to third graders. Sixth graders have mean score 83 and standard deviation 9 on the same test. To provide separate "norms" for each grade, we want scores in each grade to have mean 100 and standard deviation 20. (Round your answers to two decimal places.) (a) What linear transformation will change third-grade scores x into new...
Q3. Z Distribution: From Probabilities to Proportions (percentages) Answer the following questions with this scenario: To...
Q3. Z Distribution: From Probabilities to Proportions (percentages) Answer the following questions with this scenario: To assist students with deficient math skills, the local school district decides to use the standardized math test scores to identify students who are scoring in the lowest 4% in the whole population of fifth-graders. These students will then be enrolled in after-school tutoring sessions provided by the district to improve their math skills. Helpful tips: Review the tutorial videos on “how to use the...
Scores on a standardized test are normally distributed with a mean of 100 and a standard...
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?
In a recent year, the scores for the reading portion of a test were normally distributed,...
In a recent year, the scores for the reading portion of a test were normally distributed, with a mean of 20.2 and a standard deviation of 5.4. Complete parts (a) through (d) below. (a) Find the probability that a randomly selected high school student who took the reading portion of the test has a score that is less than 16. The probability of a student scoring less than 16 is . (Round to four decimal places as needed.) (b) Find...
In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide standardized test for the students in her class.
2. Transforming X values into z-scores In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide standardized test for the students in her class. Instead of looking at the scores relative to the norms in the state, the teacher wants to understand the scores relative to the students who will be in the class. To do so, she decides to convert the test scores into 2-scores relative to the mean and standard deviation of...
In a recent year, the scores for the reading portion of a test were normally distributed,...
In a recent year, the scores for the reading portion of a test were normally distributed, with a mean of 21.6 and a standard deviation of 6.2. Complete parts (a) through (d) below. (a) Find the probability that a randomly selected high school student who took the reading portion of the test has a score that is less than 16 The probability of a student scoring less than 16 is? (Round to four decimal places as needed.) (b) Find the...
In preparation for the upcoming school year, a teacher looks at raw test scores on the...
In preparation for the upcoming school year, a teacher looks at raw test scores on the statewide standardized test for the students in her class. Instead of looking at the scores relative to the norms in the state, the teacher wants to understand the scores relative to the students who will be in the class. To do so, she decides to convert the test scores into z-scores relative to the mean and standard deviation of the students in the class....
A standardized exam's scores are normally distributed. In a recent year, the mean test score was...
A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1466 and the standard deviation was 310. The test scores of four students selected at random are 1860 1200 2160 and 1360. Find the z-scores that correspond to each value and determine whether any of the values are unusual.
Look at image, thank you. Scores for a common standardized college aptitude test are normally distributed...
Look at image, thank you.
Scores for a common standardized college aptitude test are normally distributed with a mean of 510 and a standard deviation of 110. Randomly selected men are given a Test Prepartion Course before taking this test. Assume, for sake of argument, that the test has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 587.8. P(X> 587.8) = Enter your answer as a number accurate to...
In a recent year, the scores for the reading portion of a test were normally distributed, with a mean of 20.2 and a standard deviation of 5.4. Complete parts (a) through (d) below. (a) Find the probability that a randomly selected high school student who took the reading portion of the test has a score that is less than 16. The probability of a student scoring less than 16 is . (Round to four decimal places as needed.) (b) Find...
Look at image, thank you.
Scores for a common standardized college aptitude test are normally distributed with a mean of 510 and a standard deviation of 110. Randomly selected men are given a Test Prepartion Course before taking this test. Assume, for sake of argument, that the test has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 587.8. P(X> 587.8) = Enter your answer as a number accurate to...
Most questions answered within 3 hours.
-
An entomologist discovers a dung beetle rolling a ball of dung
along the ground, and decides...
asked 59 minutes ago -
Humans have used horses for transportation for millions of
years. Therefore, they will use horses for...
asked 2 hours ago -
The following are the Jensen Corporation's unit costs of making
and selling an item at a...
asked 3 hours ago -
Does direct Medicare reimbursement of Advanced practice nurses
increase access to their services?
asked 4 hours ago -
List and explain why a company would choose to use a
published
compensation survey vs. creating...
asked 4 hours ago -
A discrete random variable X can take values from 1 to 10. Find
the variance of...
asked 4 hours ago -
The primary financial goal of a corporation is to maximize:
shareholders wealth.
earnings per share.
stock...
asked 4 hours ago -
determine whether the vectors u=(1,2,3,), v=(-2,1,0) and
w=(1,0,1) are linearly dependent or independent.
asked 4 hours ago -
python
Define a function called print_values which takes a dictionary
object as a parameter. The function...
asked 5 hours ago -
In Chapter 1 you created a program named Triangle in
which you displayed a seven-line triangle...
asked 5 hours ago -
Research question: What are the differences between separately
stated and non separately stated transactions in an...
asked 6 hours ago -
By using Arduino write a code that connects two LEDs to two
push-buttons. Each button controls...
asked 7 hours ago