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miss earned a score of 94 on her latest exam. the professor
determined that all of...
1) A professor knows that in the past, the average amount of time spent studying the...
1) A professor knows that in the past, the average amount of time spent studying the night before the first exam was 140 minutes with a normal distribution and a standard deviation of 75.1. The professor finds that the average amount of time spent studying the night before the first exam for the current class of 40 students is 165 minutes. a) Please identify the following values from the above study description. The population mean (µ) equals ________________. The population...
7) A retired statistics professor has recorded final exam results for decades. The mean final exam...
7) A retired statistics professor has recorded final exam results for decades. The mean final exam score for the population of her students is 82.4 with a standard deviation of 6.5 . In the last year, her standard deviation seems to have changed. She bases this on a random sample of 25 students whose final exam scores had a mean of 80 with a standard deviation of 4.2 . Test the professor's claim that the current standard deviation is different...
A professor found that historically, the scores on the final exam tend to follow a normal...
A professor found that historically, the scores on the final exam tend to follow a normal distribution. A random sample of nine test scores from the current class had a mean score of 187.9 points and a sample standard deviation of 32.4 points. Find the 90% confidence interval for the population mean score of the current class. A. [167.81, 207.99] B. [ 170.13 , 205.67] C. [ 166.73, 209.07] D. None of these answers are correct.
Question: A professor recorded three statistics exam scores and other variables for 20 students in her...
Question: A professor recorded three statistics exam scores and other variables for 20 students in her statistics course. There are seven variables in this data set: (1) ID number, (2) Sex, (3) Study Place, and (4) Hours of Work, (5) Exam 1 score, (6) Exam 2 score, and (7) Exam 3 score. · Sex (1 = Males, 2 = Females) · Study_Place ("Where do you study the most frequently for this class?" 1 = My room, 2 = Library, 3 = Coffee shops,...
A z score of 1.25 represents an observation that is a) 1.25 standard deviation below the...
A z score of 1.25 represents an observation that is a) 1.25 standard deviation below the mean. b) 0.25 standard deviations above the mean of 1. c) 1.25 standard deviations above the mean. d) both b and c Assume that your class took an exam last week and the mean and standard deviation of the exam were 85 and 5, respectively. Your instructor told you that 30 percent of the students had a score of 90 or above. You would...
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...
A professor wishes to test a claim that the mean test score of her first class...
A professor wishes to test a claim that the mean test score of her first class is lower than the mean test score of her second class. A random sample of size 16 with a mean of 61.3 and a standard deviation of 8.6 is selected from her first class. A random sample of size 18 with a mean of 74.3 and a standard deviation of 13.4 is selected from her second class. Assume that test scores in both classes...
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 difference between a standard score of -1.0 and a standard score of 1.0 is a)...
The difference between a standard score of -1.0 and a standard score of 1.0 is a) the standard score 1.0 is farther from the mean than -1.0 b) the standard score -1.0 is farther from the mean than 1.0 c) the standard score 1.0 is above the mean while -1.0 is below the mean. d) the standard score -1.0 is above the mean while 1.0 is below the mean. 16 17 If the test scores on an art history exam...
Suppose your statistics professor reports test grades as z-scores, and you got a score of 1.79...
Suppose your statistics professor reports test grades as z-scores, and you got a score of 1.79 on an exam. a) Write a sentence explaining what that means b) Your friend got a z-score of-1. If the grades satisty the Nearty Normal Condition, about what percent of the class scored lower than your fiend? a) Choose the corredt answer belaw O A. The score was 1.79 points lower than the mean score in the ciass O B. The score was 1.79...
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...
A professor wishes to test a claim that the mean test score of her first class is lower than the mean test score of her second class. A random sample of size 16 with a mean of 61.3 and a standard deviation of 8.6 is selected from her first class. A random sample of size 18 with a mean of 74.3 and a standard deviation of 13.4 is selected from her second class. Assume that test scores in both classes...
The difference between a standard score of -1.0 and a standard score of 1.0 is a) the standard score 1.0 is farther from the mean than -1.0 b) the standard score -1.0 is farther from the mean than 1.0 c) the standard score 1.0 is above the mean while -1.0 is below the mean. d) the standard score -1.0 is above the mean while 1.0 is below the mean. 16 17 If the test scores on an art history exam...
Suppose your statistics professor reports test grades as z-scores, and you got a score of 1.79 on an exam. a) Write a sentence explaining what that means b) Your friend got a z-score of-1. If the grades satisty the Nearty Normal Condition, about what percent of the class scored lower than your fiend? a) Choose the corredt answer belaw O A. The score was 1.79 points lower than the mean score in the ciass O B. The score was 1.79...
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