a) An engineer wishes to compare the mean lifetimes of two types of transistors in an...
A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 11 bulbs of model A showed a mean lifetime of 1345 hours and a standard deviation of 102 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1389 hours and a standard deviation of 82 hours. Assume that the populations of lifetimes for each...
please answer neatly and correctly! light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 9 bulbs of model A showed a mean lifetime of 1234 hours and a standard deviation of 81 hours. Analysis of 15 bulbs of model B showed a mean lifetime of 1391 hours and a standard deviation of 110 hours. Assume that the populations...
The MINITAB printout shows a test for the difference in two population means. Two-Sample T-Test and CI: Sample 1, Sample 2 Two-sample T for Sample 1 vs Sample 2 N Mean StDev SE Mean Sample 1 6 28.00 4.00 1.6 Sample 2 9 27.86 4.67 1.6 Difference = mu (Sample 1) - mu (Sample 2) Estimate for difference: 0.14 95% CI for difference: (-4.9, 5.2) T-Test of difference = 0 (vs not =): T-Value = 0.06 P-Value = 0.95...
1. The test for the mean with detailed work shown and detailed discussion. Use the 6-step procedure for hypothesis testing. Explain why you are testing for the numbers in Ho(null hypothesis) for both the populations. A) Test if the mean price for clothing in the entire American Eagle store population, using the American Eagle data, is greater than 69. Conduct the test at the 5% level of significance. B) Do the same for the Forever 21 data with the same...
A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women she randomly selected 60 men and 78 women to participate in the study each subject was required to step up and down 6 inch platform the pulse of each subject was then recorded the following results were obtained n Two sample T for Men vs Women N Mean StDev Men 60 112.2 11.5 Women 78 118.9 14.4 99%...
3. [42.5 points] A large tech company is evaluating two programming languages. Twenty- four entry-level data scientists were asked to code a procedure. Twelve were randomly assigned to Programming Language 1, while the remaining twelve were assigned to Programming Language 2. Suppose you want to test whether the tech company should conclude Programming Language 1 is more inefficient. The following table shows the time required by each data scientist to code the procedure in seconds. Refer to Appendix A to...
3. [42.5 points] A world-renowned tech company is evaluating two programming languages. Ten data scientists, proficient in both programming languages, are asked to code 10 procedures in both languages, and the time in seconds) is recorded. Suppose you want to test whether the tech company should be indifferent to the choice of programming language. The following table shows the results for both data scientists. Refer to Appendix A to answer items 3(a)-3(g). Data Scientist 1 1 2 3 Programming Language...
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 26.2 with a standard deviation...
Please SUMMARIZE this article define the main problem and what they are trying to study. Briefly summariZe the main FINDINGS & CONCLUSION. Who performed and published this article? Explain how the type of publication affects the validity of the information. Who do you think is the intended audience of this article, and how did you deduce that? What was the sample size? b) Who was included in the sample? (sex, race, gender, orientation, age, etc.) c) Identify the methods used...