Mathematics, 09.04.2021 03:50, rania32

Suppose that the specifications for certain kind of ribbon call for a mean breaking strength of 185 lbs. 5 randomly selected pieces showed the mean strength 183.1 lbs with a standard deviation 8.2 lbs. Assume that the data comes from normal population. (a) (6 points) Construct a 95% confidence interval for the true (but unknown) mean breaking strength (b) (5 points) Determine at 1% level of significance test whether the mean strength is less than 185.

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Suppose that the specifications for certain kind of ribbon call for a mean breaking strength of 185...