QUESTION 15 The scores on a mathematics exam have a mean of 74 and a standard...
QUESTION 15 The scores on a mathematics exam have a mean of 74 and a standard deviation of 8. Find the x-value that corresponds to the z-score 2.575
A.
53.4
B.
82.0
C.
94.6
D.
76.6
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QUESTION 15 The scores on a mathematics exam have a mean of 74
and a standard...
Scores on the SAT mathematics section have a normal distribution with mean 4-500 and standard deviation...
Scores on the SAT mathematics section have a normal distribution with mean 4-500 and standard deviation o=100. a. What proportion of students score above a 550 on the SAT mathematics section? Round your answer to 4 decimal places. b. Suppose that you choose a simple random sample of 16 students who took the SAT mathematics section and find the sample mean x of their scores. Which of the following best describes what you would expect? The sample mean will be...
The scores on a Statistics exam are normally distributed with a mean 75 with a standard...
The scores on a Statistics exam are normally distributed with a mean 75 with a standard deviation of 5. If nine students are randomly selected what is the probability that their mean score is greater than 68. (a) .0808 (b) -.4000 (c) .9192 (d) .0001 (e) .9999 29. Refer to question 28. Suppose that students with the lowest 10% of scores are placed on academic probation, what is the cutoff score to avoid being placed on academic probation? (a) >...
7. Scores on a recent national Mathematics exam were normally distributed with a mean of 82...
7. Scores on a recent national Mathematics exam were normally distributed with a mean of 82 and a standard deviation of 7. A. What is the probability that a randomly selected exam score is less than 70 B. What is the probability that a randomly selected exam score is greater than 90? C. If the top 2.5% of test scores receive Merit awards, what is the lowest score necessary to receive a merit award?
Question 3: Consider the Standard Normal Distribution with mean 0 and standard deviation 1. Find the...
Question 3: Consider the Standard Normal Distribution with mean 0 and standard deviation 1. Find the following. a) P (z>0.5) b) P(z 1.5) c) P (-0.49 < z1.5) Question 4: If you have a normal distribution with mean 14 and standard deviation of 2. What is P(x >16)? Question 5 Professor Hardy assumes the exam scores are normally distributed and wants to grade "on a curve." The mean score was 68, with a standard deviation of 9, If he wants...
13. Scores on a national mathematics exam (The RVCMT) vary normally with a mean of 150...
13. Scores on a national mathematics exam (The RVCMT) vary normally with a mean of 150 points and a standard deviation of 30 points. a. What percentage of students taking the exam score at least 190? b. What is the 80 percentile of the exam? c. Based on an SRS of 25 students, what is the sampling distribution of the sample mean? Why? d. What is the probability that the mean score for an SRS of 25 students is less...
13. Scores on a national mathematics exam (The RVCMT) vary normally with a mean of 150...
13. Scores on a national mathematics exam (The RVCMT) vary normally with a mean of 150 points and a standard deviation of 30 points. a. What percentage of students taking the exam score at least 190? b. What is the 80 percentile of the exam? c. Based on an SRS of 25 students, what is the sampling distribution of the sample mean? Why? d. What is the probability that the mean score for an SRS of 25 students is less...
The mean exam score for 44 male high school students is 20.1 and the population standard...
The mean exam score for 44 male high school students is 20.1 and the population standard deviation is 4.7. The mean exam score for 58 female high school students is 19.6 and the population standard deviation is 4.1. At a = 0.01, can you reject the claim that male and female high school students have equal exam scores? Complete parts (a) through (e). Click here to view page 1 of the standard normal distribution table. Click here to view page...
Question 4 0.5 pts A data set has a mean of 44. In this data set,...
Question 4 0.5 pts A data set has a mean of 44. In this data set, a raw score X-40 corresponds to the standardized score z-1. What is the standard deviation for this data set? Hint:take advantage of the formula for Z-score Question 5 0.5 pts A data set has a standard deviation of 2.5. In this data set, a raw score X-30 corresponds to the standardized score z = 1.30. What is the mean of this data set? Hint:take...
Suppose that scores on a statistics exam are normally distributed with a mean of 77 and...
Suppose that scores on a statistics exam are normally distributed with a mean of 77 and a standard deviation of 4. Find the probability of a student scoring less than 80 on the exam using the following steps. (a) What region of the normal distribution are you looking to find the area of? (to the left of a zscore, to the right of a z-score, between two z-scores, or to the left of one z-score and to the right of...
The mean SAT score in mathematics, H, is 544. The standard deviation of these scores is...
The mean SAT score in mathematics, H, is 544. The standard deviation of these scores is 26. A special preparation course claims that its graduates will score higher, on average, than the mean score 544. A random sample of 50 students completed the course, and their mean SAT score in mathematics was 551. At the 0.1 level of significance, can we conclude that the preparation course does what it claims? Assume that the standard deviation of the scores of course...
Scores on the SAT mathematics section have a normal distribution with mean 4-500 and standard deviation o=100. a. What proportion of students score above a 550 on the SAT mathematics section? Round your answer to 4 decimal places. b. Suppose that you choose a simple random sample of 16 students who took the SAT mathematics section and find the sample mean x of their scores. Which of the following best describes what you would expect? The sample mean will be...
Question 3: Consider the Standard Normal Distribution with mean 0 and standard deviation 1. Find the following. a) P (z>0.5) b) P(z 1.5) c) P (-0.49 < z1.5) Question 4: If you have a normal distribution with mean 14 and standard deviation of 2. What is P(x >16)? Question 5 Professor Hardy assumes the exam scores are normally distributed and wants to grade "on a curve." The mean score was 68, with a standard deviation of 9, If he wants...
13. Scores on a national mathematics exam (The RVCMT) vary normally with a mean of 150 points and a standard deviation of 30 points. a. What percentage of students taking the exam score at least 190? b. What is the 80 percentile of the exam? c. Based on an SRS of 25 students, what is the sampling distribution of the sample mean? Why? d. What is the probability that the mean score for an SRS of 25 students is less...
13. Scores on a national mathematics exam (The RVCMT) vary normally with a mean of 150 points and a standard deviation of 30 points. a. What percentage of students taking the exam score at least 190? b. What is the 80 percentile of the exam? c. Based on an SRS of 25 students, what is the sampling distribution of the sample mean? Why? d. What is the probability that the mean score for an SRS of 25 students is less...
The mean exam score for 44 male high school students is 20.1 and the population standard deviation is 4.7. The mean exam score for 58 female high school students is 19.6 and the population standard deviation is 4.1. At a = 0.01, can you reject the claim that male and female high school students have equal exam scores? Complete parts (a) through (e). Click here to view page 1 of the standard normal distribution table. Click here to view page...
Question 4 0.5 pts A data set has a mean of 44. In this data set, a raw score X-40 corresponds to the standardized score z-1. What is the standard deviation for this data set? Hint:take advantage of the formula for Z-score Question 5 0.5 pts A data set has a standard deviation of 2.5. In this data set, a raw score X-30 corresponds to the standardized score z = 1.30. What is the mean of this data set? Hint:take...
The mean SAT score in mathematics, H, is 544. The standard deviation of these scores is 26. A special preparation course claims that its graduates will score higher, on average, than the mean score 544. A random sample of 50 students completed the course, and their mean SAT score in mathematics was 551. At the 0.1 level of significance, can we conclude that the preparation course does what it claims? Assume that the standard deviation of the scores of course...
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