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Q1: The marks of final exam on a calculus exam are normally distributed with a sample...
Q1: The marks of final exam on a calculus exam are normally dis with a sample...
Q1: The marks of final exam on a calculus exam are normally dis with a sample standard deviation of 0.51. A random sample of 12 scores on the exam has a mean of 2.71. Find a 90% confidence interval for the mean of the exam grades. 20.05 = 1.64 and 10.05 = 1.80 02: Thirty-five percent of customers had orders exceeding $100. If 20% of the customers have orders exceeding $100 and also pay with credit card, determine the probability...
Scores on a Statistics Final Exam are normally distributed. Using a 95% confidence level, find the...
Scores on a Statistics Final Exam are normally distributed. Using a 95% confidence level, find the sample size necessary to predict the population mean within 3 points. Assume the population standard deviation is 8 points.
4. Scores on an exam are normally distributed with a population standard deviation of 5.5. A...
4. Scores on an exam are normally distributed with a population standard deviation of 5.5. A random sample of 50 scores on the exam has a mean of 28. (a) (5 pts.) Construct 80% confidence interval. (b) (5 pts.) Construct 85% confidence interval. (c) (5 pts.) Construct 92% confidence interval. (d) (5 pts.) When confidence level increases what will happen to the confidence interval.
Scores on a 100-point final exam administered to all applied calculus classes at a large university are normally di...
Scores on a 100-point final exam administered to all applied calculus classes at a large university are normally distributed with a mean of 69.3 and a standard deviation of 29.45. (a) What percentage of students taking the test had scores between 60 and 80? (Round your answer to one decimal place.) % (b) At what score was the rate of change of the probability density function for the scores a maximum?
Scores on a 100-point final exam administered to all...
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 71 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals. ol. (a) Find the 47th percentile of the scores. (b) Find the 65th percentile of the scores. (c) The instructor wants to give an A to the students whose scores were in the top 12% of the class....
1.) The scores for the final exam in Math 2250 is normally distributed with a mean...
1.) The scores for the final exam in Math 2250 is normally distributed with a mean of 60 and standard deviation of 15. Given that 120 students wrote the final exam, i.) State and test the hypothesis that the mean score is greater than 65 at a 10% level of significance. Include a p-value in your answer. 141 ii.) Construct and interpret 90% confidence level for the mean score. [3] Using the same level of significance, determine how many students...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standa...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 93? (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90?
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 932 (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90? Part: 0/3 Part 1...
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 71 and a standard deviation of 8. Use the T1-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 47 percentile of the scores (b) Find the 65 percentile of the scores. (c) The instructor wants to give an A to the students whose scores were in the top 12% of the class. What...
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 78 and a standard deviation of 7. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 34" percentile of the scores. (b) Find the 68th percentile of the scores. (C) The instructor wants to give an A to the students whose scores were in the top 11% of the class. What...
Q1: The marks of final exam on a calculus exam are normally dis with a sample standard deviation of 0.51. A random sample of 12 scores on the exam has a mean of 2.71. Find a 90% confidence interval for the mean of the exam grades. 20.05 = 1.64 and 10.05 = 1.80 02: Thirty-five percent of customers had orders exceeding $100. If 20% of the customers have orders exceeding $100 and also pay with credit card, determine the probability...
4. Scores on an exam are normally distributed with a population standard deviation of 5.5. A random sample of 50 scores on the exam has a mean of 28. (a) (5 pts.) Construct 80% confidence interval. (b) (5 pts.) Construct 85% confidence interval. (c) (5 pts.) Construct 92% confidence interval. (d) (5 pts.) When confidence level increases what will happen to the confidence interval.
Scores on a 100-point final exam administered to all applied calculus classes at a large university are normally distributed with a mean of 69.3 and a standard deviation of 29.45. (a) What percentage of students taking the test had scores between 60 and 80? (Round your answer to one decimal place.) % (b) At what score was the rate of change of the probability density function for the scores a maximum?
Scores on a 100-point final exam administered to all...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 71 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals. ol. (a) Find the 47th percentile of the scores. (b) Find the 65th percentile of the scores. (c) The instructor wants to give an A to the students whose scores were in the top 12% of the class....
1.) The scores for the final exam in Math 2250 is normally distributed with a mean of 60 and standard deviation of 15. Given that 120 students wrote the final exam, i.) State and test the hypothesis that the mean score is greater than 65 at a 10% level of significance. Include a p-value in your answer. 141 ii.) Construct and interpret 90% confidence level for the mean score. [3] Using the same level of significance, determine how many students...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 93? (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90?
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 8. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places. (a) What proportion of the scores were above 932 (b) What proportion of the scores were below 66? (c) What is the probability that a randomly chosen score is between 70 and 90? Part: 0/3 Part 1...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 71 and a standard deviation of 8. Use the T1-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 47 percentile of the scores (b) Find the 65 percentile of the scores. (c) The instructor wants to give an A to the students whose scores were in the top 12% of the class. What...
Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 78 and a standard deviation of 7. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals. (a) Find the 34" percentile of the scores. (b) Find the 68th percentile of the scores. (C) The instructor wants to give an A to the students whose scores were in the top 11% of the class. What...
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