Hugo averages 51 words per minute on a typing test with a standard deviation of 11...
Hugo averages 51 words per minute on a typing test with a standard deviation of 11 words per minute. Suppose Hugo's words per minute on a typing test are normally distributed. Let X= the number of words per minute on a typing test. Then, X∼N(51,11). Suppose Hugo types 69 words per minute in a typing test on Wednesday. The z-score when x=69 is ________. This z-score tells you that x=69 is ________ standard deviations to the ________ (right/left) of the mean, ________. Correctly fill in the blanks in the statement above.
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Hugo averages 51 words per minute on a typing test with a
standard deviation of 11...
Hugo averages 76 words per minute on a typing test with a standard deviation of 12.5...
Hugo averages 76 words per minute on a typing test with a standard deviation of 12.5 words per minute. Suppose Hugo's words per minute on a typing test are normally distributed. Let X= the number of words per minute on a typing test. Then, X∼N(76,12.5). Suppose Hugo types 66 words per minute in a typing test on Wednesday. The z-score when x=66 is ________. This z-score tells you that x=66 is ________ standard deviations to the ________ (right/left) of the...
QUESTION 22.1 POINT Hugo averages 78 words per minute on a typing test with a standard...
QUESTION 22.1 POINT Hugo averages 78 words per minute on a typing test with a standard deviation of 5.5 words per minute. Suppose Hugo's words per minute on a typing test are normally distributed. Let X = the number of words per minute on a typing test. Then, X-N(78,5.5). . This score Suppose Hugo types 61 words per minute in a typing test on Wednesday. The 2-score when x = 61 is tells you that x = 61 is standard...
The population standard deviation for the typing speeds for secretaries is 4 words per minute. If...
The population standard deviation for the typing speeds for secretaries is 4 words per minute. If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Use the table above for the z-score, and be sure to round up to the nearest integer.
Standardize a Normally Distributed Random Varlable Question Suppose X~N(13.5, 1.5), and 9. Find and interpret the z...
Standardize a Normally Distributed Random Varlable Question Suppose X~N(13.5, 1.5), and 9. Find and interpret the z-score of the standardized normal random variable. Sorry, that's incorrect. Try again? The mean is The z-score when x-9 is standard deviations to the left of the mean. This z-score tells you that x-9 is
Standardize a Normally Distributed Random Varlable Question Suppose X~N(13.5, 1.5), and 9. Find and interpret the z-score of the standardized normal random variable. Sorry, that's incorrect. Try again? The...
A 100-item test has a mean of 75 and standard deviation of 10. Assuming the scores...
A 100-item test has a mean of 75 and standard deviation of 10. Assuming the scores are normally distributed determine the raw score (rounded to the nearest integer) corresponding to the 25th percentile. (Fill in the corresponding blanks)
Part A. Score on 25 point test is normally distributed with mean 22 and standard deviation...
Part A. Score on 25 point test is normally distributed with mean 22 and standard deviation 5. You took a sample of 9 students. The mean for this group is 19.111111 Test the hypothesis that the performance of this group is different than the regular group. Use α=.05. What is the alternative hypothesis? What is the rejection region? Calculated z What is your decision? Yes or no? You believe that the group from an honors and would perform better than...
STAT 10 Study guide for Test 2 1. Assume the random variable x is normally distributed...
STAT 10 Study guide for Test 2 1. Assume the random variable x is normally distributed with mean = 50 and standard deviations = 8.1. Compute the following probability. Be sure to draw a normal curve with the area corresponding to the probability shaded. Round your answers to two decimal places a. P(x > 48.5) b. P(45 <x<51) 2. There are two college entrance exams that are often taken by students, Exam 1 and Exam 2. The composite score on...
Use the accompanying data set on the pulse rates (in beats per minute) of males to...
Use the accompanying data set on the pulse rates (in beats per minute) of males to complete parts (a) and (b) below. Click the icon to view the pulse rates of males. a. Find the mean and standard deviation, and verify that the pulse rates have a distribution that is roughly normal. The mean of the pulse rates is beats per minute. (Round to one decimal place as needed.) 78 85 95 76 50 59 52 58 64 64 51...
12. A certain group of test subjects had pulse rates with a mean of 84.484.4 beats...
12. A certain group of test subjects had pulse rates with a mean of 84.484.4 beats per minute and a standard deviation of 11.211.2 beats per minute. Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high. Is a pulse rate of 56.856.8 beats per minute significantly low or significantly high? Significantly low values are nothing beats per minute or lower. (Type an integer or a decimal. Do not round.) 14....
Problem 8 (10% total; 2% per part) The mean yearly income for electrical engineers in the United States is $73,794 and the standard deviation is $2,500. If yearly income for electrical engineers...
Problem 8 (10% total; 2% per part) The mean yearly income for electrical engineers in the United States is $73,794 and the standard deviation is $2,500. If yearly income for electrical engineers is modelled using a normally distributed random variable, X, then determine the following using z-score: a) P(X s $75,000) b) P(X> $70,000) c) P($71,495 s X< $76,250) d)o such that P(X< c) = 0.18-18% e)o such that P((X-c) > X or X > (X + c)) = 0.05...
QUESTION 22.1 POINT Hugo averages 78 words per minute on a typing test with a standard deviation of 5.5 words per minute. Suppose Hugo's words per minute on a typing test are normally distributed. Let X = the number of words per minute on a typing test. Then, X-N(78,5.5). . This score Suppose Hugo types 61 words per minute in a typing test on Wednesday. The 2-score when x = 61 is tells you that x = 61 is standard...
Standardize a Normally Distributed Random Varlable Question Suppose X~N(13.5, 1.5), and 9. Find and interpret the z-score of the standardized normal random variable. Sorry, that's incorrect. Try again? The mean is The z-score when x-9 is standard deviations to the left of the mean. This z-score tells you that x-9 is
Standardize a Normally Distributed Random Varlable Question Suppose X~N(13.5, 1.5), and 9. Find and interpret the z-score of the standardized normal random variable. Sorry, that's incorrect. Try again? The...
A 100-item test has a mean of 75 and standard deviation of 10. Assuming the scores are normally distributed determine the raw score (rounded to the nearest integer) corresponding to the 25th percentile. (Fill in the corresponding blanks)
STAT 10 Study guide for Test 2 1. Assume the random variable x is normally distributed with mean = 50 and standard deviations = 8.1. Compute the following probability. Be sure to draw a normal curve with the area corresponding to the probability shaded. Round your answers to two decimal places a. P(x > 48.5) b. P(45 <x<51) 2. There are two college entrance exams that are often taken by students, Exam 1 and Exam 2. The composite score on...
Use the accompanying data set on the pulse rates (in beats per minute) of males to complete parts (a) and (b) below. Click the icon to view the pulse rates of males. a. Find the mean and standard deviation, and verify that the pulse rates have a distribution that is roughly normal. The mean of the pulse rates is beats per minute. (Round to one decimal place as needed.) 78 85 95 76 50 59 52 58 64 64 51...
Problem 8 (10% total; 2% per part) The mean yearly income for electrical engineers in the United States is $73,794 and the standard deviation is $2,500. If yearly income for electrical engineers is modelled using a normally distributed random variable, X, then determine the following using z-score: a) P(X s $75,000) b) P(X> $70,000) c) P($71,495 s X< $76,250) d)o such that P(X< c) = 0.18-18% e)o such that P((X-c) > X or X > (X + c)) = 0.05...
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