Mathematics, 12.12.2019 02:31 blessed4628
Anew production process has been adopted for ub company that manufactures brushings. historical data suggest that these brushing diameter is normally distributed with a standard deviation of 1mm. it is believed that the modification has not affected the shape of the distribution or the standard deviation, but the value of the mean diameter may have changed. a sample of 25 housing units is selected and hole diameter is 6.45. (a) calculate a confidence interval for true average hole diameter using a confidence level of 90%. (b) a processor engineer believes that the confidence interval derived from (a) is too large for quality control. he/she wishes to derive a confidence interval at 90% confidence level that is smaller than 0.1mm. what should his/her sample size be? provide the smallest possible sample size to achieve 0.1mm confidence interval.
Answers: 3
Mathematics, 21.06.2019 19:00, alaina3792
Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable
Answers: 3
Mathematics, 21.06.2019 20:00, stichgotrich7159
Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take
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Mathematics, 21.06.2019 20:30, cogger9348
3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.
Answers: 1
Mathematics, 22.06.2019 00:30, anytka21ovxqoa
Which ordered pair is a solution of the equation? 2x+3y=10
Answers: 1
Anew production process has been adopted for ub company that manufactures brushings. historical data...
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