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.
Shopping for garage doors: 1  Some new models include an automatic garage door opener; if not, an opener can add $130-$300 to the total price. 2  ThisOldHouse.com provides a photo gallery of ideas for out-of-the-ordinary garage doors. 3  HomeTips.com provides do-it-yourself illustrated installation instructions. Models with these options tend to be in the higher end of the price ranges. 2  Installing a garage door is considered a medium-difficult do-it-yourself project for a two-person team, at an average cost of $300-$500, depending on the type of door chosen.