Ask Question, Ask an Expert


Ask Statistics and Probability Expert

Suppose there are two elementary schools in a county. One school (A) loans all its students a laptop computer for use in classes. The other (B) does not. We would like to compare performance on a standardized test for the two groups of students.??There are 28 students randomly chosen from school A and 34 from school b. The average test score for A is 78, and for B is 75. The sample standard deviation for A is 7 and for B is 10. While the population variances are unknown, we will assume they are equal.

a. What is the 99% confidence interval for the difference between the two school's scores. (For consistency, let the difference d=A-B.)

b. Suppose we want to perform a two-tailed test where H0 is that μd=0. What is (approximately) the p-value of the test?

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M944292

Have any Question? 

Related Questions in Statistics and Probability

1 purposethis homework implements algorithms for anomaly

1. Purpose This homework implements algorithms for anomaly detection. 2. Description Introduction Comparing with signature based IDS, statistical based IDS uses the statistical metrics and algorithms to differentiate the ...

Consider an ar2 process which is described by the

Consider an AR(2) process which is described by the recursion Where    is an IID random process with zero-mean and variance  (a) Show that the autocorrelation function of the AR(2) process satisfies the difference equati ...

The inputnbspnbspto a filter is a discrete-time zero-mean

The input   to a filter is a discrete-time zero-mean random process whose autocorrelation function is   The input/output relationship of the filter is given by (a) Find the autocorrelation function of the output  (b) Fin ...

Let wnnbspbe an iid sequence of zero-mean gaussian random

Let W n  be an IID sequence of zero-mean Gaussian random variables with variance    Define a discrete-time random process   where   is a constant. (a) Find the mean function  (b) Find the autocorrelation function,

A college admissions officer is interested in determining

A college Admissions Officer is interested in determining the extent to which a prospective student's high school GPA and/or SAT score can be used as a basis for predicting his or her college freshman GPA. He believes th ...

N balls labeled 1 through are placed in box 1 while a box 2

N balls labeled 1 through are placed in Box 1 while a Box 2 is initially empty. At each time instant, one of the balls is chosen (with equally probability) and moved to the other box.    be the number of balls in Box 1 a ...

Statistics for decision making assignment-statistical

Statistics for Decision Making Assignment- Statistical Concepts: Probability Binomial Probability Distribution Calculating Binomial Probabilities - Open a new Excel worksheet. 1. Open spreadsheet 2. In cell A1 type "succ ...

A certain lti system has an inputoutput relationship given

A certain LTI system has an input/output relationship given by (a) Find the output autocorrelation  , in terms of the input autocorrelation,  (b) Find the output PSD  in terms of the input  (c) Does your answer to part ( ...

Thirty percent of a corporations blue-collar employees were

Thirty percent of a corporation's blue-collar employees were in favor of a modified health care plan, and 23% of its blue-collar employees favored a proposal to change the work schedule. Thirty- percent of those favoring ...

Manufacturer x produces personal computers pcs at two

Manufacturer X produces personal computers (PCs) at two different locations in the world. Fifteen percent of the PCs produced at location A are delivered to a retail outlet defective, while five percent of the PCs produc ...

  • 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

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate