3. An election survey report result with state that the standard error of the mean ( standarddeviation of the mean sampling distribution ) is 20. Population standard deviation is 500.a) How many the size ( large ) of the sample used in surveys?b) How many probability that the average estimate will located in +24 intervalsof the population mean ?

Given that s.d =500 , standard error of mean =20

Answered: 3. An election survey report result…

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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2. A statistic test has a mean of 78 and a standard deviation of 6. a) What is the z-score of a student who scored 89 on the test? b) What is the z-score of a student who scored 64 on the test? c) What is the z-score of a student who scored 78 on the test? d) What is the score of a student whose z-score is 1.24? e) What is the score of a student whose z-score is -.31? f) What is the score of a student whose z-score is -1? 3. For males in a certain towWn, the systolic blood pressure is normally distributed with a mean of 135 and a standard deviation of 8. a) What is the probability that a randomly selected male's systolic blood pressure will be greater than 143? b) What is the probability that a randomly selected male's systolic blood pressure will be less than 119?
An advertising executive wants to estimate the mean amount of time that consumers spend with digital media daily. From past studies, the standard deviation is estimated as 47 minutes What sample size is needed if the executive wants to be 90% confident of being correct to within +7 minutes? n=Round up to the nearest integer.)
3. Normal Distribution and Z - Scores Assume a normal distribution for a population of scores for a standardized exam. The average exam score is 70, and the standard deviation is 5. Jeff's exam score is 63. a) What percentage of the population has an exam score greater than Jeff's? b) What percentage of the population has an exam score greater than Jeff's but less than the score of 74? c) If 10,000 people were given the exam, how many of them have an exam score less than Jeff's?
370,415, 460,460,469,610,648, 729,1175 For this set of data, A) mathematically are there any outliers? Of so justify B) what is the poplulation standard deviation C) what would the value for 1.5 standard deviation above the mean?
A credit score measures a person's creditworthiness. Assume the average credit score for Americans is 693. Assume the scores are normally distributed with a standard deviation of 45. a) Determine the interval of credit scores that are one standard deviation around the mean. b) Determine the interval of credit scores that are two standard deviations around the mean. c) Determine the interval of credit scores that are three standard deviations around the mean. a) The interval of credit scores that are one standard deviation around the mean ranges from (Type integers or decimals. Use ascending order.) b) The interval of credit scores that are two standard deviations around the mean ranges from (Type integers or decimals. Use ascending order.) c) The interval of credit scores that are three standard deviations around the mean ranges from (Type integers or decimals. Use ascending order.) to to to W
1. In a distribution of six scores, the deviations from the mean for five of the scores are +5, +3, +1, 0, and-3.What is the value of the deviation for the sixth score? 2. On the midterm exam in their anthropology course, Jan’s deviation score was +5, Kim’s was -12, andLeslie’s was 0.a) of these three, who did the best and who did the worst?b) the mean for the class was 80. What was the raw score for Jan, Kim, and Leslie?
Solve step by step in digital format Suppose that the average income of the engineers hired at REDUNO presents an approximately normal behavior with a mean of $17,000 pesos and a standard deviation of $3,000 pesos. a) What percentage of the employees will have incomes greater than $20,000 pesos?b) In a random sample of 50 employees, about how many people can be expected to have incomes of less than $15,000 pesos?
A,b,c

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