A study was done to examine whether the perception of service quality at hotels differed by gender. Hotel guests were randomly selected to rate service items on a5-point scale. The sum of the items for each guest was determined and a summary of the guest scores are provided in the table.SampleStandardSizeMeanDeviationMale12839.927.35Female11739.147.37Use a 95% confidence interval to compare the mean service-rating scores for male and female guests at the hotel. Interpret the interval.Let the male hotel guests be population 1 and the female hotel guests be population 2.The 95% confidence interval for (H, -H2) is ( H D-(Round to two decimal places as needed.)Interpret this confidence interval.this interval. There isevidence to indicate that the mean service-rating scores between male andWith 95% confidence, the difference in the means of the two populations is estimated to fall0.female guests at the hotel differ because the interval02.02 .50

We have given that n1 = 128, n2 = 117 x̅1 = 39.92, x̅2 = 39.14 s1 = 7.35, s2 = 7.37

Answered: Use a 95% confidence interval to…

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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A confidence interval for a mean is (-11, 10). This interval would be wider if The sample mean was larger or the variability of the data was larger. The investigator wanted to be more confident of their results, or there was more information. The variability of the data was small, or the sample mean was larger. The variability of the data was larger, or the investigator wanted to be more confident. None of the above.
Poindexter received a 55 on a biology test (X= 50) and a 45 on a philosophy test (X = 50). He is considering whether to ask his two professors to curve the grades using z-scores. (a) Does he want the SX to be large or small in biology? Why? (b) Does he want the SX to be large or small in philosophy? Why?
Which of the following statements about MAE and SSE is FALSE? Check all that apply. O Lower values are preferred. O Errors do not cancel out each other. They are unitless. MAE stands for Mean Absolute Error. O MAE is always greater than SSE. None can be negative. U A positive value means the forecasting method is biased. O SSE is the scaled down version of MAE. They can be used to compare two applications of the same forecasting method. O SSE stands for Sum of Standard Errors.
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A certain coffee packing company has three packing lines with the following production volumes of boxes per hour. You are an analyst and the manager entrusts you to carry out an analysis to establish whether or not there is a difference in the production of each line at 95% confidence.
define the parameter and write the null and alternative hypotheses in the past, the mean score of the seniors at South High on the American College Testing (ACT) college entrance examination has been 20. This year a special preparation course is offered, and all 43 seniors planning to take the ACT test enroll in the course. The mean of their 43 ACT scores is 21.1. points. The principal believes that the new course improves ACT scores and requests funding for the program. You're hired to assess the efficacy of the prep course. Is the out come of the sample mean of 21.1, good evidence that the prep course improved the seniors' ACT test scores?
Virginia wants to estimate the percentage of students who live more than three miles from the school. She wants to create a 95% confidence interval which has a margin of error of at most 5%. How many students should be polled to create the confidence interval? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Use the table of values above.
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Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
Use the data on student load. to test the claim that mean student load is more than 6.5 units. Use α = 0.10. Assume all requirements have been met. Student Unit Load 3, 12, 6, 9, 6, 12, 15, 12, 7, 9, 3 Test the claim that mean student load is more than 6.5 units. Use α = 0.10. Assume all requirements have been met.
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Statistics students surveyed 135 students at Tallahassee Community College. From their data we are 95% confident that between 44.7% and 61.9% of all TCC students are female. The students realize that this interval contains a large margin of error. What can they do to make a narrower interval? 1. Survey more students. 2. Use a 99% confidence level. 3. Survey more students and use a 99% confidence interval. 4. None of the other choices.

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