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{"ops":[{"insert":"The mean breaking strength of cables supplied by a manufacturer is 1800 with standard "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"deviation 100. By a new technique in the manufacturing process, it is claimed that the "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"breaking strength of the cable has increased. In order to test the claim a sample of 50 cables "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"is tested. It is found that the mean breaking strength is 1850. Can we support the claim at "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"1% level of significance?"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"19) A coin is tossed 400 times and was found to result in head 245 times. Can we conclude the "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"coin is fair?"},{"insert":"\n"}]}
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