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To study the birth weight of infants whose mothers smoke, a physician records the weights of 100 newborns whose mothers smoke. a. Find a 98% confidence interval based on for the mean birth weight of children of smoking mothers if the sample mean was found to be 6.1 pounds. Assume the population standard deviation is 2.1 pounds. b. Physician thinks that the margin of error is too large. Estimate the sample size required to estimate the mean birth weight within 0.3 pounds with a 98% confidence interval.
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Mike has est that the store sells about 800 SONY sets annually. Estimated holding cost is $30 per set and ordering cost is $20 per order. Describe the inventory pattern graphically.
Construct a 90 percent confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of +/-} 0.03 grams with 90 percent confidence?
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The dealership would now like some general information based on the entire sample of vehicles. Calculate and explain the following:
an instructor believes that 20 or less of the students who finish a statistics course get an a grade. a sample of 90
This morning the office you are monitoring has eight office visits on the schedule. What is the probability that
in a study designed to test the effectiveness of acupuncture for treating migraines 142 subjects were treated with
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