assume that the standard deviation of exam scores for a class is 10. We want to...

assume that the standard deviation of exam scores for a class is 10. We want to compare scores between two lab sections. How many exams to detect a mean difference of 10 points between the sections? Solve the problem using power approach(type two error)

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

A) Suppose that the mean and standard deviation of the scores on a statistics exam are...

A) Suppose that the mean and standard deviation of the scores on a statistics exam are 89.2 and 6.49, respectively, and are approximately normally distributed. Calculate the proportion of scores below 77. 1) 0.0301 2) 0.9699 3) We do not have enough information to calculate the value. 4) 0.2146 5) 0.7854 B) When students use the bus from their dorms, they have an average commute time of 8.974 minutes with standard deviation 3.1959 minutes. Approximately 66.9% of students reported a...

The test scores for a math exam have a mean of 72 with a standard deviation...

The test scores for a math exam have a mean of 72 with a standard deviation of 8.5. Let the random variable X represent an exam score. a) Find the probability that an exam score is at most 80. (decimal answer, round to 3 decimal places) b) Find the probability that an exam score is at least 60. (decimal answer, round to 3 decimal places) c) Find the probability that an exam score is between 70 and 90. (decimal answer,...

A set of exam scores is normally distributed with a mean = 82 and standard deviation...

A set of exam scores is normally distributed with a mean = 82 and standard deviation = 4. Use the Empirical Rule to complete the following sentences. 68% of the scores are between and . 95% of the scores are between and . 99.7% of the scores are between and . LicensePoints possible: 3 This is attempt 1 of 3.

PART I Suppose that the mean and standard deviation of the scores on a statistics exam...

PART I Suppose that the mean and standard deviation of the scores on a statistics exam are 78 and 6.11, respectively, and are approximately normally distributed. Calculate the proportion of scores above 74. 1) 0.8080 2) 0.1920 3) 0.2563 4) We do not have enough information to calculate the value. 5) 0.7437 PART II When students use the bus from their dorms, they have an average commute time of 9.969 minutes with standard deviation 3.9103 minutes. Approximately 27.23% of students...

A set of exam scores is normally distributed with a mean = 80 and standard deviation...

A set of exam scores is normally distributed with a mean = 80 and standard deviation = 8. Use the Empirical Rule to complete the following sentences. 68% of the scores are between and . 95% of the scores are between and . 99.7% of the scores are between and . Get help: Video

Scores on a national exam vary normally with a mean of 400 and standard deviation of...

Scores on a national exam vary normally with a mean of 400 and standard deviation of 75. a. What must a student score to be in the 90th percentile? b. if 16 student take the exam, what is the probabiltiy that their mean score is at most 390? Please make sure you explain and show your work, as to how you got the standard devation of 75?

Scores on the SAT exam approximate a normal distribution with mean 500 and standard deviation of...

Scores on the SAT exam approximate a normal distribution with mean 500 and standard deviation of 80. USe the distribution to determine the following. (Z score must be rounded to two decimal places: (a) The Z- score for a SAT of 380 (2pts) (b) The percent of SAT scores that fall above 610 (3pts) (c) The prpbability that sn SAT score falls below 720 (3pts) (d) The percentage of SAT scores that fall between 470 and 620 (4pts)

Scores on an MBA placement exam are reported to have a normal distribution with standard deviation...

Scores on an MBA placement exam are reported to have a normal distribution with standard deviation 18. The exam officials stated that the average score for all students was 70. You take a random sample of 50 students and find their average score is 67. Use your data to estimate the mean score for all students taking the MBA placement exam -Verify your answer using calculations and show your work. Students at the union want to estimate the average number...

The formula for a sample Standard Deviation is Say we want to use standard deviation as...

The formula for a sample Standard Deviation is Say we want to use standard deviation as a way of comparing the amount of spread present in each of two different distributions. What is the effect of squaring the deviations? (1 mark) How does this help us when we compare the spreads of two distributions? (1 mark) With reference to the formula and the magnitude of data values, explain why introducing an outlier to a dataset affects the Standard Deviations more...

A sample of 10 students record their scores on the final exam for their statistics class....

A sample of 10 students record their scores on the final exam for their statistics class. The mean of the sample is 81 with sample standard deviation 7 points. Analysis of the 10 sample values indicated that the population is approximately normal. We wish to find the 95% confidence interval for the population mean test scores. 1. What is the confidence level, c? 2. Which of the following is correct? a. To find the confidence interval, a z-critical value should...

Subjects