.5 (a) For a certain type of manufactured product, the weight is expected to be 350 gm, and the standard deviation is known to be 20 gm. The mean weight of 9 randomly selected items was 362 gm. Was there evidence of a change in weight, and if so at what level of significance? (b) The process was changed, but with the standard deviation remaining the same. Nine randomly selected items had weights (in grams) of 327, 350, 374, 359, 397, 367, 331, 368, 385. Is there now evidence that the mean weight has been increased? (c) For the data in part (b), would it be reasonable to suggest that the standard deviation has probably changed?
.5 (a) For a certain type of manufactured product, the weight is expected to be 350 gm, and the standard deviation is known to be 20 gm. The mean weight of 9 randomly selected items was 362 gm. Was there evidence of a change in weight, and if so at what level of significance? (b) The process was changed, but with the standard deviation remaining the same. Nine randomly selected items had weights (in grams) of 327, 350, 374, 359, 397, 367, 331, 368, 385. Is there now evidence that the mean weight has been increased? (c) For the data in part (b), would it be reasonable to suggest that the standard deviation has probably changed?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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