Hello I need help
Posted: Wed May 04, 2022 11:45 am
Hello I need help
HW 7 CLT: Problem 9 (1 point) The time in hours for a worker to repair an electrical instrument is a Normally distributed random variable with a mean of u and a standard deviation of 50. The repair times for 12 such instruments chosen at random are as follows: 183 222 303 262 178 232 268 201 244 183 201 140 ). Part a) Find a 95% confidence interval for μ. For both sides of the bound, leave your answer with 1 decimal place. ( Part b) Find the least number of repair times needed to be sampled in order to reduce the width of the confidence interval to below 25 hours.
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