Standard deviation is a measure of how much(M)a normal person's behavior changes in a given timetwo sets of scores vary togetherdifference there is between the highest and the lowest score in a samplescores in a group differ from the mean of that groupscores from a sample differ from that of the population

It is needed to discuss about the standard deviation.

Answered: Standard deviation is a measure of how…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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the mean is 146, and standard deviation is 35. A score of 181 is how many z-scores above the mean?
Grades in an exam are normally distributed with a mean of 60 and a standard deviation of 10. What is the 90th percentile of the distribution of grades ? ( Round to a whole number)
Students time to finish their homework is approximately normal with a mean of 80 minutes and a standard deviation of 20 minutes. If students are given one hour to complete the exam, what's the proportion of students who don't complete the exam? 1. - 0.6423 2. - 0.1593 3. - 0.3418 4. - 0.5000 5. - 0.8413 Show calculations on how you determined your answer
The spread or variation in the sampling distribution of means is called the of the mean. Standard difference Standard error Difference score Standard deviation
dy The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year. In order to find out whether they still air the same number of commercials on average or not, random and independent samples of 100 recent prime time airings from both networks have been considered. The first network aired a mean of 109.5 commercials during prime time with a standard deviation of 5.2. The second network aired a mean of 110.5 commercials during prime time with a standard deviation of 5.3. Since the sample sizes are quite large, assume that the population standard deviations can be estimated to be equal to the sample standard deviations, 5.2 and 5.3. At the 0.10 level of significance, is there sufficient evidence to support the claim that the mean number, μ₁, of commercials aired during prime time by the first station is not equal to the mean number, μ₂, of commercials aired during prime time by the second station?…
Midterm exam scores are normally distributed with a mean of 75 and a standard deviation of 6. If the exam is given to 10,000 students, we would expect No one to receive a score of 87 No one to have received a score below 63 Half the scores to fall between 70 and 83 NO Half the scores to fall between 64 and 88 Just over one third of the scores to fall between 75 and 81
% of all data lies within one standard deviation to the left of mean % of all data lies with two standard deviation to the right of mean
The incomes of math tutors in a tutoring center of a university are normally distributed with a mean of $1100 and a standard deviation of $150 what percentage of tutors earn less than $900 a month
Interpret the Z score for a student who scored an 91 on an exam that had a mean of 86 and a standard deviation of 5. One mean above the standard deviation One standard deviation above the mean One standard deviation below the mean One mean below the standard deviation
Calories consumed by members of a track team the day before a race are normally distributed, with a mean of 1,800 calories and a standard deviation of 100 calories. If a normal curve is sketched using these data, what is the range for 3 standard deviations to the right and to the left of the mean? Group of answer choices 0–3,600 1,700–1,900 1,600–2,000 1,500–2,100
Accordi the historical data, the life expectancy in Mexico is equal to the life expectancy in Spain. A new study has been made to see whether this has changea. Records of 205 individuals from Mexico who died recently are selected at random. The 205 individuals lived an average of 71.8 years with a standard deviation of 2.6 years. Records of 250 individuals from Spain who died recently are selected at random and independently. The 250 individuals lived an average of 71.2 years with a standard deviation of 3.0 years. Assume that the population standard deviation of the life expectancy can be estimated by the sample standard deviations, since the samples that are used to compute them are quite large. At the 0.05 level of significance, is there enough evidence to support the claim that the life expectancy, H1, in Mexico is not equal to the life expectancy, µ,, in Spain anymore? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to at least three…
Interval Freq 0 - 9 6 10 - 19 12 20 - 29 16 30 - 39 11 40 - 49 5 Calculate the mean and standard deviation for the table of sample data above.

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