1) A researcher was interested in comparing the salaries of female and male employees at a particular company.Simple random samples of 8 female employees and 15 male employees yielded the followingweekly salaries (in dollars).Female Male595 722 518760 562 904556 880 1150904 520 1205520 500 480915 1250 970743 750 605660 1640Determine a 98% confidence interval for the difference, μ₁ - μ2, between the mean weekly salaries of femaleemployees and the mean weekly salaries of male employees at this particular company. Normal probability plotsof weekly salaries of female and male indicate normal populations.

The data shows the salaries of female and male employees at a particular company.

Answered: 1) A researcher was interested in…

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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Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 65 students in the highest quartile of the distribution, the mean score was x = 175.10. Assume a population standard deviation of ? = 7.55. These students were all classified as high on their need for closure. Assume that the 65 students represent a random sample of all students who are classified as high on their need for closure. How large a sample is needed if we wish to be 99% confident that the sample mean score is within 1.5 points of the population mean score for students who are high on the need for closure? (Round your answer up to the nearest whole number.)students
If actual period demand varies from the forecast by more than 3MAD, this indicates: there is 3% chance that the forecast is wrong. there is a 98% chance that the forecast is wrong. there is a 97% chance that the forecast is wrong. there is a 3% chance that the forecast is correct Moving to the next question prevents changes to this answer:
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 75 students in the highest quartile of the distribution, the mean score was x = 176.90. Assume a population standard deviation of ? = 7.71. These students were all classified as high on their need for closure. Assume that the 75 students represent a random sample of all students who are classified as high on their need for closure. Find a 95% confidence interval for the population mean score ? on the "need for closure scale" for all students with a high need for closure. (Round your answers to two decimal places.)
The following statistics are computed by sampling from three normal populations whose variances are equal: (You may find it useful to reference the table and the g table.) = 30.1, n₁ = 7; 2 = 35.5, n2 = 9; 3 = 40.9, n3 = 4; MSE = 25.0 a. Calculate 95% confidence intervals for H1 H2, H1 - Hз, and μ2 - μз to test for mean differences with Fisher's LSD approach. (Negative values should be indicated by a minus sign. Round final answers to 2 decimal points.) Population Mean Differences H1-H2 H1 H3 H2 H3 Confidence Interval Can we conclude that the population means differ?
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 70 students in the highest quartile of the distribution, the mean score was x = 176.30. Assume a population standard deviation of σ = 7.71. These students were all classified as high on their need for closure. Assume that the 70 students represent a random sample of all students who are classified as high on their need for closure. How large a sample is needed if we wish to be 99% confident that the sample mean score is within 1.7 points of the population mean score for students who are high on the need for closure? (Round your answer up to the nearest whole number.)
The weight and systolic blood pressure of 26 randomly selected males in the age group 25 to 30 are shown below. Assume that weight and blood pressure are jointly normally distributed. (a) Test the hypothesis that p=0, using a=0.05 (b) Construct a 95% confidence interval for the correlation coefficient. Systolic BP Systolic BP Subject Weight Subject Weight 1 165 130 14 172 153 2 167 133 15 159 128 180 150 16 168 132 4 155 128 17 174 149 5 212 151 18 183 158 6. 175 146 19ao 215 150 7 190 150 20 195 163 8 210 140 21 180 156 9. 200 148 22 143 124 10 ot 149 i so 125 b23 240oun 170 11 158 133 24 235 165 12 169 135 25 192 160 13 170 150 26 187 159
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 65 students in the highest quartile of the distribution, the mean score was x = 178.50. Assume a population standard deviation of σ = 8.41. These students were all classified as high on their need for closure. Assume that the 65 students represent a random sample of all students who are classified as high on their need for closure. Find a 95% confidence interval for the population mean score μ on the "need for closure scale" for all students with a high need for closure. (Round your answers to two decimal places.) lower limit upper limit
A researcher was interested in comparing the salaries of female and male employees at a particular company. Independent simple random samples of 8 female employees and 15 male employees yielded the following weekly salaries (in dollars). Female Male 495 722 518 760 562 904 556 880 1150 904 520 805 520 500 480 1005 1250 970 743 750 605 660 1640 Use a 0.01 significance level to test the claim that the mean salary of female employees is less than the mean salary of male employees.
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 84 students in the highest quartile of the distribution, the mean score was x = 176.70. Assume a population standard deviation of σ = 8.39. These students were all classified as high on their need for closure. Assume that the 84 students represent a random sample of all students who are classified as high on their need for closure. How large a sample is needed if we wish to be 99% confident that the sample mean score is within 1.6 points of the population mean score for students who are high on the need for closure? (Round your answer up to the nearest whole number.) USE SALT students

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