Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

Hypothesis testing for difference between two means.

To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, as the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of 24.9. Is this an important difference at _ = .05?

(a) Status the hypotheses for a right-tailed test.

(b) Obtain a test statistic and p-value assuming equal variances. Interpret these results.

(c) Is the difference in mean scores large enough to be important?

(d) Is it reasonable to suppose equal variances?

(e) Carry out a formal test for equal variances at _ = .05, showing all steps clearly. 

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M918230

Have any Question? 


Related Questions in Statistics and Probability

Why is a z score a standard score why can standard scores

Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions?

The centers for disease control and prevention released a

The Centers for Disease Control and Prevention released a report in 1998 that attributed part of the increase in youth smoking in the 1980s to the use of the cartoon character, Joe Camel, in cigarette advertising. Using ...

Exposure to medicine x during pregnancy was investigated

Exposure to medicine 'x' during pregnancy was investigated for 108 mothers of children with congenital defects and 108 mothers of normal controls. The researchers examined exposure to medicine 'x' during the first trimes ...

1 what is a restricted range and what effect does it have

1. What is a restricted range, and what effect does it have on correlation coefficients? How would you detect and correct a restricted range? 2. How do we know whether a particular score is an outlier?

Focusing on leadership and changeintroductionin this

Focusing on leadership and change Introduction In this assignment, we will focus on you, your relationship to leadership and change in your work context and the management ideas that have influenced those topics. Rather ...

A random sample of the price of gasoline from 20gas

A random sample of the price of gasoline from 20gas stations in a region gives the statistics below. Complete parts a) and b) ybar = $3.59, s = $0.24 a) Find a 95% confidence interval for the mean price of regular gasoli ...

A business student is interested in estimating the 99

A business student is interested in estimating the 99% confidence interval for the proportion of students who bring laptops to campus. He wishes a precise estimate and is willing to draw a large sample that will keep the ...

The mixed methods approachthrough your work in this unit

The Mixed Methods Approach Through your work in this unit, you have come to understand just how different quantitative and qualitative decision-making techniques are. Perhaps that is why a mixed methods decision-making t ...

What is the variation in lsquofalse rejects that is not

What is the variation in ‘False rejects' that is NOT attributable to the Inspectors (as Sum of squares, not as percentage or mean)? 349.4 84.9 264.5 10.58 21.2

1 should demand characteristics be eliminated or

1. Should demand characteristics be eliminated or strengthened in an experiment? Explain. 2. How do researchers detect and eliminate placebo effects? 3. What effect does error variance have on the results of an experimen ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro