1. A retail store receives an average of 5.9 return per day. For a sample of 7 days, it receivedthe following number of retums: 7, 8, 9, 8, 7, 7, 10. At 5% significance level, can weconclude the mean number returns is more than 5.9?A) State Ho and H.B) Test the hypothesis using the P-Value approach.C) What are Type I and Type II errors?D) Based on the given data, determine the extreme value without rejecting the Ho.

Given Information: A store receives an average of 5.9 return per day. Sample size n=7 Sample data is…

Answered: 1. A retail store receives an average…

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 study is designed to determine the effect of an office-training course on typing productivity. Fifteen typists who have not taken the course are randomly selected. The investigator assigns 20 pages of equally difficult text to be typed by each typist both before and after completing the training course. The investigator wants to find out whether the training course has reduced the number of errors by more than 10. Define d = Before − After. Significance level What conclusion should we reach if the p-value is 0.113?
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The work week for adults in the US that work full time is normally distributed with a mean of 47 hours. A newly hired engineer at a start-up company believes that employees at start-up companies work more on average then most working adults in the US. She asks 12 engineering friends at start-ups for the lengths in hours of their work week. Their responses are shown in the table below. Test the claim using a 10% level of significance. Give answer to at least 4 decimal places. Hours 48 43 58 51 45 62 47 55 49 49 52 53 a. What are the correct hypotheses? Ho: Select an answer H₁: Select an answer b. Test Statistic = Based on the hypotheses, find the following: c. p-value = ? 0 ? 0 d. The correct decision is to Select an answer Add Work hours hours e. The correct summary would be: Select an answer hours of all employees at start-up companies work more than the US mean of 47 hours. that the mean number of
11) A recent study focused on the number of times men and women send a Twitter message in a day. The sample information is summarized here. Sample Size 25 Sample Mean Population Standard Deviation Men Women 23 30 28 10 At the 0.01 significance level, we ask if there is a difference in the mean number of times men and women send a Twitter message in a day. What is the test statistic for this hypothesis? A) z-statistic B) t-statistic C) p-statistic D) df-statistic

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