My Math Forum Null Hypothesis and Test of Significance

 April 1st, 2007, 05:42 AM #1 Senior Member   Joined: Dec 2006 From: New Jersey Posts: 378 Thanks: 1 Null Hypothesis and Test of Significance Weekly sales of regular ground coffee at a supermarket have in the recent past varied according to a normal distribution with mean mu=354 units per week and std. dev. sigma =33 units. The store reduces the prce by 5%. Sales in the next three weeks are 405,378 and 411 units. Is this good evidence that average sales are now higher? Ho: mu = 354 Ha: mu > 354 a.)Find the value of the test statistic xbar b.)Sketch the normal curve for the sampling distribution of xbar when null hypothesis(Ho) is true. Shade the area that represents the P-value for the observed outcome. c.)Calculate the P-value d.)Is the result statistically significant at the alpha = .05 level? Is it significant at the alpha = .01? Do u think there is convincing evidence that mean sales are higher?

 Tags hypothesis, null, significance, test

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post bilo57 Advanced Statistics 0 December 9th, 2013 10:01 AM jynxster Probability and Statistics 0 July 29th, 2013 07:03 AM rips Advanced Statistics 0 July 20th, 2011 09:42 AM SysInv Advanced Statistics 1 October 25th, 2010 02:41 PM symmetry Advanced Statistics 0 April 7th, 2007 03:05 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top