A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height the balls bounce upward to be 54.8 inches. This average is maintained by periodically testing random samples of 25 tennis balls. If the t-value falls between minust 0.98 and t 0.98, then the company will be satisfied that it is manufacturing acceptable tennis balls. A sample of 25 balls is randomly selected and tested. The mean bounce height of the sample is 56.9 inches and the standard deviation is 0.25 inch. Assume the bounce heights are approximately normally distributed. Is the company making acceptable tennis balls? Find minust 0.98 and t 0.98. negative t 0.98 equals negative 2.172 t 0.98 equals 2.172
A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from...
A company manufactures is on When tenis b are dropped on a concrete w ace from a height of 100 inches the company was the mean height the ball bounce upward to be 54.6 inches. This average is maintained by periodical testing random samples of 25 tennis balls the value os benen-toe and to then the company will be said that is manchuring acceptable bas. A sample of 25 balls is randomly selected and tested. The mean bounce height of...
Can someone teach me how to answer the questions mentioned above? 2. (a) The table below shows weekly earnings (in Ringgit Malaysia) of full- time male and female workers for five years Weekly carning of male workers, x Weekly earning of female workers, y 670 679 695713 722 512 529 552 573 585 (8 marks) Calculate coefficient of determination. Interpret vour answer (b) A nutritionist claims that the mean local fruit consumption by a person in Kuala Lumpur is 3.4...
A company manufactures light bulbs. The company wants the bulbs to have a mean life span of 991 hours. This average is maintained by periodically testing random samples of 16 light bulbs. If the t-value falls between -t0.95 and t0.95, then the company will be satisfied that it is manufacturing acceptable light bulbs. For a random sample, the mean life span of the sample is 999 hours and the standard deviation is 22 hours. Assume that life spans are approximately...