probability is about .95 that the 95% confidence interval will include the true population parameter. On the other hand, 2.5% of the time the highest value in the confidence interval will be smaller than the true value, while 2.5% of the time the smallest value in the confidence interval will be greater than the true value.
Set prices with room to move. Most people expect prices at garage sales to be just the starting price and are about 25% to 50% above the seller's (ie your) bottom-line price to allow for negotiating. The amount depends on the condition of the item and how much you are prepared to haggle.
According to a recent national survey, the average commission for car salesmen is $250 per vehicle sold. The average selling price per vehicle is about $1,000 over the invoice cost. And the average number of cars sold is 8 to 10 vehicles per salesman per month.ccording to a recent national survey, the average commission for car salesmen is $250 per vehicle sold. The average selling price per vehicle is about $1,000 over the invoice cost. And the average number of cars sold is 8 to 10 vehicles per salesman per month.