A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.92 years and the standard deviation is 10.19 years.a) What is the standard error of the mean?b) How would the standard error change if the sample size had been 400 instead of 25? (Assume that the sample standard deviation didn't change.)22 21 35 23 3335 26 44 44 1448 25 27 12 4348 38 46 36 3538 38 32 23 37...a) The standard error of the mean is(Round to two decimal places as needed.)b) How would the standard error change if the sample size was 400 instead of 25 with the same sample standard deviation? Select the correct choice below and fill in any answer boxes within your choice.O A. The standard error would increase. The new standard error would betimes the old.B. The standard error would decrease. The new standard error would be the old standard error divided byO C. The standard error would not change.

Answered: A survey of 25 randomly selected…

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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Each year, tornadoes that touch down are recorded. The following table gives the number of tornadoes that touched down during each month of one year. Determine the range and sample standard deviation. Range = 3 65 tornadoes 4 82 49 62 S= (Round to two decimal places as needed.) 116 60 203 102 91 91
A team of ten (10) construction workers who are working on a project are classified according to the skill levels, Classes A to D. The table below shows the number of workers in each of the four (4) classes and their respective hourly pay-rate. Pay-rate (Rands/hour) Number of workers Class A 80 Class B 60 Class C 55 Class D 50 4. Calculate the mean hourly pay-rate for the 10 workers. A. R24.50/hour B. R57/hour C. R57.50/hour D. R61.75/hour
Which statement below is correct? a. Standard deviation should be used when calculating z for a single score, while standard error should be used when calculating z for a sample mean. b. When calculating z for a single score or for a sample mean, the standard error should be used. c. Standard error should be used when calculating z for a single score, while standard deviation should be used when calculating z for a sample mean. d. When calculating z for a single score or for a sample mean, the standard deviation should be used.
the number of various multiples births in ghana to 10years are listed. find the range,the variance and standard deviation of the data sets. which set of data is the most variable? triplets quadruplets quintuplets 5877 7110 5937 145 468 369 46 85 91 6898 6118 6885 434 355 501 69 67 85 6208 6742 6750 418 506 439 512 68 77 86 67 6742
2. Determine the Standard Deviation and Variance of the data set as shown and compare the results using Data Analysis. Classmates Midterm Final 1 70 81 2 98 89 3 80 95 4 79 90 5 65 82 62 75 7 90 88 8 91 89 100 91 10 71 83 11 85 79 12 87 90 13 84 87
Calculate the mean deviation (from mean) from the following data : Marks : 0-10 10-20 20-30 30-40 40-50 50-60 60-70 No. of Students : 5 8 15 7 3
Question 3 The number of hours worked per week for a sample of ten students is shown below. Student Hours 1 39 28 10 16 26 34 38 9. 4 10 32 1. Determine the mean, median, and mode. 2. What is the range of the data for the hours worked? 3. What is the standard deviation for the number of hours worked? 2. 3. 4, 7, 8.
16 34 41 21 340 A survey of 25 randomly selected customers found the ages shown (in years). The mean is 31.64 years and the standard deviation is 9.62 years. a) What is the standard error of the mean? 38 43 26 43 20 b) How would the standard error change if the sample size had been 400 instead of 25? (Assume that the sample standard deviation didn't change.) 26 20 36 32 32 35 11 25 48 30 31 25 40 46 38 a) The standard error of the mean is (Round to two decimal places as needed.) b) How would the standard error change the sample size was 400 instead of 25 with the same sample standard deviation? Select the correct choice below and fill in any answer boxes within your choice. O A. The standard error would increase. The new standard error would be times the old, O B. The standard error would decrease. The new standard error would be the old standard error divided by O C. The standard error would not change.
Use a calculator to find the standard deviation of this sample data: 122 141 140 118 155 174 198 133 168 195 Round to two decimals. Submit Question
The ages of undergraduate students at two universities (one in the east and one in the west) are being compared. Researchers want to know if there is a difference in the mean age of students at the two universities. The population standard deviations are known. The following data shows the results of samples collected at each institution: School Location n (sample size) sample mean ( ) population standard deviation West 33 25.78 6.29 East 35 23.16 7.52 What is the value of the test statistic for the previous problem? (Enter your answer as a positive value even if you calculated a negative test statistic value i.e. if you calculated -1.311 you should enter 1.311). Round your answer to 3 decimal places.

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