3. Lindvall’s Friendship Club has had members for 40 years as well as new joiners. Lindvall pulls a sample of 20 members and discovers that the sample mean is 28 years with a sample standard deviation of 6 years.a. On what chapter is this problem based? Is there an identical example in that chapter? Report the page number(s) of that example. To what issues does one need to be alert to complete this problem?b. What is the mean of the population?c. What is the standard deviation of the sampling distribution of the mean?d. Develop a 90% confidence interval for the population mean.e. Develop a 95% confidence interval for the population mean.f. Even though the sample mean is 28 years, could the population mean be 35 years at a 90% confidence level?g. Even though the sample mean is 28 years, could the population mean be 38 years at a 95% confidence level?

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Answered: 3. Lindvall’s Friendship Club has had…

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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1. IQ scores have a mean of 100 and a standard deviation of 16. Albert Einstein reportedly had an IQ of 160. Convert Einstein's IQ score to a z score. a. b. If we consider "usual IQ scores to be those that convert z scores between -2 and 2, is Einstein's IQ usual or unusual? C. The organization MENSA, which calls itself the "high IQ society", requires a score of 130 or higher. What percent of adults would qualify for membership? 2. In a recent study on world happiness, participants were asked to evaluate their current lives on a scale from 0 to 10, where 0 represents the worst possible life and 10 represents the best possible life. The responses were normally distributed, with a mean of 5.4 and a standard deviation of 2.2. Find the probability that a randomly selected study participant's response was: a. Less than 4 b. Between 4 and 6 c. More than 8 3. The red blood cell count for a population of adult males can be approximated by a normal distribution, with a mean of 5.4 million cells…
Consider the data from the Anthropology 105 class. The mean for women is 64.33 in and the standard deviation is 2.64 in. The average height of men in the US is approximately 5ft 10in. What proportion of women represented here are shorter than the average man?
1. The position number w(letter) tells us where in the alphabet the given letter is located. For instance: w("b") = 2. Find the mean, median and population standard deviation for the vowel position numbers in the English alphabet.
Which of the following statements is TRUE about the mean scores of the two sections? Descriptive Statistics Score Section A Section B Valid 45 45 Missing Mean 8.556 9.222 Std. Deviation 5.995 6.420 O a. Section B is more knowledgeable on the selected topic in Geometry than section A. b. Section B's mean score is higher than that of Section A's. O c. Section A's mean score is higher than that of Section B's. O d. Section A is more knowledgeable on the selected topic in Geometry than section B.
Please show the steps to solve the problems 28 a, b, and c.
Proper explanation is required.Skip if u r not sure.
3. Class problems for Chapter 2: 1) Suppose students' grades in statistics class have a symmetrical and bell-shaped distribution with a mean equal to 77 and a standard deviation of 6. Answer the following questions: a. What is the percentage of grades that are less than 83? b. What is the percentage of grades that are greater than 65 and 89? c. What is the z-score for grade = 70? d. What percentage of grades have a z-score of greater than 1?
1. Lindvall Real Estote Virtual Tours produces videos of 12 minutes in length with a standard deviation of 3 minutes. The mean and standard deviation reported are population parameters. Suppose we select a sample of 64 videos produced by Lindvall Real Estate Virtual Tours. To what issues does one need to be alert to complete this problem? a. On what chapter is this problem based? Is there an identical example in that chapter? Report the page number(s) of that example. b. What can we say about the shape of the distribution of the sample mean time? What can we say about its dispersion? C. What is the standard error of the mean time? d. What percent of the sample means that we could possibly generate would have a sample mean greater than 12.7 minutes? e. What percent of the sample means that we could possibly generate would have a sample mean greater than 11.7 minutes? f. What percent of the sample means that we could possibly generate would have a sample mean less than 12.7 minutes? 6…
12. What is the standard deviation of the data {7, 1, 7, 10, 5, 3, 2}? 3.0 O 2.7 5.0 9.0
119. The moving violation data from Problem (111) have been summarized in the following table. Recall: These were sample data. # VIOLATIONS FREQUENCY 13 5 2 5 4 2 1 11 27 Note: x = 214 a. Calculate the mean of the number of violations. b. Calculate the standard deviation for the number of violations data. c. Explain why, despite being grouped, the answers are exactly the same as in Exercise (111). 1. Table 3124
2. Ms. Palac, a sociologist, made a study on the age in years of a woman at the time of her first marriage. She randomly selected a sample of 24 and 21 married women from Village A and Village B, respectively. The following data are the mean and standard deviation for each group: Village A: x = 18.63 and s = 5.54 Village B: x = 24.90 and s = 5.54 Test the hypothesis that the women in Village A get married younger than women in Village B. Use 0.10 significance level. Step 1: Null and Alternative Hypothesis Ho: Ha: Step 2: Level of Significance and appropriate test statistic Step 3: Determine the Critical Region Degrees of Freedom (df): Critical Region: Step 4: Compute the z or t value Computations: Step 5: Decide whether to accept or reject Ho Step 6: Conclusion

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