According to a new study by ABC, the average time spent by young adults ages 20 to 25 in using theirphones for social media sites is 6.77 hours per week. In a class, you gathered 30 individuals to serve assamples for your study, which resulted in the finding that the average time that they consume on socialmedia sites is 7.8 hours per week. Suppose that the sample standard deviation is 2.9 hours and the levelof significance is 0.10.Answer the following:1. Is this significant enough to conclude that the average time in a week that your class spends onsocial media sites is greater than the average time determined by the ABC study?2. Give the mean value for the null hypothesis.

Given information Level of significance=0.10, n=sample size=30, sample mean x̄=7.8, s=sample…

Answered: According to a new study by ABC, the…

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 researcher gathered data on five randomly selected individuals from a data set. The ages are 25, 27, 20, 21, and 29. What is the standard deviation for respondent's age?
The Robotics Manufacturing Company operates an equipment repair business where emergency jobs arrive randomly at the rate of two jobs per 8-hour day. The company's repair facility is a single - server system operated by a repair technician. The service time varies, with a mean repair time of 3.2 hours and a standard deviation of 2.0 hours. The company's cost of the repair operation is $27 per hour. In the economic analysis of the waiting line system, Robotics uses $37 per hour cost for customers waiting during the repair process. (a) What are the arrival rate and service rate in jobs per hour? (Round your answers to four decimal places.) Show the operating characteristics. (Round your answers to four decimal places. Report time in hours.) Show the total cost per hour. (Express the total cost per hour in dollars. Round your answer to the nearest cent.) The company is considering purchasing a computer-based equipment repair system that would enable a constant repair time of 3.2 hours.…
123456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 < A B College High School 496 528 496 592 544 512 656 528 480 576 560 656 496 624 640 608 = 420 432 432 564 528 588 456 516 432 396 420 552 Data + с Part b Mean D Difference Between the Means Part d Significance Level (Alpha) E Can we reject the null hypothesis? (Enter "Can" or "Cannot") College Part c After reading these instructions delete all text in this shaded area. Use the XLMiner Analysis ToolPak to conduct your t-Test analysis. After deleting all text in this shaded area, set the output range in the ToolPak to the top left cell of this area (D8). Your t-Test output should fit into this shaded area. F 0.05 High School Formula H #N/A #N/A #N/A #N/A J K L
What is the relationship between the mean of a population and the mean of its sampling distribution?
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