A random sample of 35 individuals in the waiting line for service by a bankofficer is selected.From the sample, we found that the mean waiting time was 22 minutes with astandard deviation of 8 minutes. The bank officer wants to estimate themean waiting time.i) Define the population parameter of interest in this problem.ii) Calculate the margin of error for a 90% confidence interval.ii) Using a 90% confidence level, estimate the population mean waiting timefor all individuals waiting in the service line.

Given, Sample size, n = 35 Sample mean, X = 22 Sample standard deviation, s = 8 Confidence interval…

Answered: A random sample of 35 individuals 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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Paint used to paint lines on roads must reflect enough light to be clearly visible at night. Researchers have 2 new types of paints they want to test paint type A and paint type B. For each paint type, they tested if there was statistical evidence the average reflectometer reading is greater than 35. To test each type of paint, they used 15 paint samples. Further, suppose the standard deviation is the same for both types of paints. The sample mean for paint type A was 39 and the sample mean for paint type B was 41.5. For both statistical tests, the significance level is set to .05.Which of the following is true? If they fail to reject the null hypothesis for paint type A we can conclude there is statistical evidence the average reflectometer for type A paint is 35. The p-value for the type B paint test is smaller. They rejected the null hypothesis for both paint types. Exactly two of the statements above are true. None are true.
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7. In a contest for Mr. CAMPUS Personality, two judges gave their ratings to 8 candidates. Compute the coefficient of rank correlation (spearman). Interpret the result. Judge 1 Judge 2 R₁ R₁₂ d 88 84 1. 4 -3 a² 9 87 87. 4 2. 2 0 0 85 88. 3 1 2 4 80 854 4. 79, 82. 5. 78 80. 6.5 78 78 6.5 75 79 60 35687 1 1 0 0 0.5 0.25 -1.5 2.25 7 1 1 d-17.5
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