Individuals filing federal income tax returns prior to March 31 received an average refund of $1,080. Consider the population of "last-minute" filers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15).a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lowerrefunds than do early filers. Develop appropriate hypotheses such that rejection of Ho will support the researcher's contention.Ho: µ is SelectHa: u is Selectb. For a sample of 400 individuals who filed a tax return between April 10 and 15, the sample mean refund was $920. Based on priorexperience a population standard deviation of o = $1,800 may be assumed. What is the p-value (to 4 decimals)?c. Using a = .05, can you conclude that the population mean refund for "last minute" filers is less than the population mean refundfor early fliers?Select vAnswer the next three questions using the critical value approach.d. Using a = .05, what is the critical value for the test statistic (to 3 decimals)?If your answer is negative use minus"-"sign.e. State the rejection rule: Reject H o if z is Selectf. Using a = .05, can you conclude that the population mean refund for "last minute" filers is less than the population mean refund|the critical value.for early filers?Select v

Answered: Image /qna-images/answer/137cba35-7162-493a-aa49-aa6f6dcdfe7b.jpg

Answered: a. A researcher suggests that a reason…

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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Which of the following statements is a correct comparison between Scheffe and Tukey post hoc tests? a. A Scheffe post hoc test tends to be more likely to lead to a Type I error than a Tukey post hoc test. b. A Scheffe post hoc test compares different condition mean values than a Tukey post hoc test. c. A Scheffe post hoc test tends to require a greater difference between conditions for a statistically significant difference than a Tukey post hoc test. d. A Scheffe post hoc test requires smaller sample sizes than a Tukey post hoc test.
The lecturer are concerned that students who enrolled for the course this semester are spending more time playing online games than revising for their upcoming test. In order to pass the test, students need to spend at least 6 hours per week on the course materials. They conducted a survey of 120 students from Section 10G and 15P for which the result shows that the mean time they spent studying for the course in a week is 5.7667 hours with a standard deviation of 1.6487 hours. Using the critical value z0.025 =1.96 , perform hypothesis testing for mean to test whether or not students spent at least 6 hours weekly to study for the course.
In a sample of 80 business trips taken by employees in the HR department, a company finds that the average amount spent for the trips was $1580 with a standard deviation of $350. In a sample of 80 trips taken by the employees in the sales department is $1750 with a standard deviation of $550. When testing the hypothesis that the averageamount spent on trips taken by the salesepartment are higher than those taken by the HR department, if the test statistic is 2.33 and the critical value is 1.96 then what is your conclusion concerning the null hypothesis? Reject the null hypothesis Fail to reject the null hypothesis
A high school counselor asks a college-bound student to complete a Readiness to Leave Home questionnaire. Among high schoolers, the questionnaire has a mean of 38.61 and a standard deviation of 9.05. The student earns a raw score of 21. Type your response to the following questions directly in Moodle: What is the student’s z score? (you do not need to show the calculation) In 1-2 sentences, what does the Z score tell us about the student's readiness to leave home? (show that you know the definition of a Z score & can apply it to this example) How would you recommend that the guidance counselor work with the student? (1 sentence)
A woman sued a computer keyboard manufacturer, charging that her repetitive stress injuries were caused by the keyboard. The injury awarded about $3.5 million for pain and suffering, but the court then set aside that award as being unreasonable compensation. In making this determination, the court identified a "normative" group of 27 similar cases and specified a reasonable award as one within two standard deviations of the mean of the awards in the 27 cases. The 27 awards were (in $1000s) 37, 65, 71, 111, 139, 145, 148, 151, 238, 290, 340, 410, 600, 750, 750, 750, 1050, 1100, 1137, 1150, 1200, 1200, 1250, 1577, 1700, 1825, and 2000, from which Ex, = 20,184, Ex,² = 24,657,774. What is the maximum possible amount that could be awarded under the two-standard-deviation rule? (Round your answer to the nearest whole number.) I USE SALT 5242 x thousand dollars
The admitting office at Sisters of Mercy Hospital wants to be able to inform patients of the average level of expenses they can expect per day. Historically, the average has been approximately $1190. The office would like to know if there is evidence of a decrease in the average daily billing. Seventy-two randomly selected patients have an average daily charge of $1164 with a standard deviation of $276. Conduct a hypothesis test to determine whether there is evidence that average Step 1 of 3 : State the null and alternative hypotheses for the test. Fill in the blank below.
1. The owner of a gasoline service station wants to study gasoline purchasing habits by motorists at his station. A random sample of 60 motorists during a certain week is selected. The sample mean is 11.3 gallons and sample standard deviation is 3.1 gallons. At the .05 level of significance, is there evidence that the average purchase is different from 10 gallons?
Are girls less inclined to enroll in science courses than boys? One study asked randomly selected fourth-, fifth-, and sixth-graders how many science courses they intend to take. The following data were obtained.
MC Qu. 10-64 Sales at a fast-food restaurant average... Sales at a fast-food restaurant average $6,000 per day. The restaurant decided to introduce an advertising campaign to Increase daily sales. In order to determine the effectiveness of the advertising campaign, a sample of 49 day's sales were taken. The sample showed average daily sales of $6,300. From past history, the restaurant knew that its population standard deviation is about $1,000. If the level of significance is 0.01, have sales increased as a result of the advertising campaign? Multiple Choice Fail to reject the null hypothesis. Reject the null hypothesis and conclude the mean is higher than $6,000 per day. Reject the null hypothesis and conclude the mean is lower than $6,000 per day. Reject the null hypothesis and conclude that mean equal to $6,000 per day.
In the past, the mean running time for a certain type of flashlight battery has been 8.5 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has changed as a result. A. Lower-tailed B. Upper-tailed C. Two-sided O A B O C
State the conclusion based on the results of the test. According to the Federal Housing Finance Board, the mean price of a single-family home two years ago was $299,100. A real estate broker believes that because of the recent credit crunch, the mean price has increased since then. The null hypothesis is not rejected. Choose the correct answer below. O A. There is not sufficient evidence to conclude that the mean price of a single-family home has increased from its level two years ago of $299,100. O B. There is sufficient evidence to conclude that the mean price of a single-family home has decreased from its level two years ago of $299,100. C. There is sufficient evidence to conclude that the mean price of a single-family home has increased from its level two years ago of $299,100. O D. There is not sufficient evidence to conclude that the mean price of a single-family home has decreased from its level two years ago of $299,100.
Ee 449.

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