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Allen is an appliance salesman who works on commission. A random sample of 39 days showed that the sample standard deviation value of sales was s = $215. How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x ?
John runs a computer software store. He counted 130 people who walked by his store in a day, 59 of whom came into the store. Of the 59, only 24 bought something in the store.
A study was done on the accuracy of advertisements by the five types of electronics stores in a city. On each of the six days, items were randomly selected from the advertisements for each type of store and the actual price was compared to the adv..
What is the optimal strategy for producing 500 tons of newsprint pulp, 600 tons of packaging pulp, and 300 tons of print stock quality pulp at minimum cost?
Describe the difference in the determination of a confidence interval of a normal distribution if the variance is known or unknown.
What is the probability that the sum of their scores exceeds 1200 and probability that the average of the scores of all 400 student
A production line operates with a mean filling weight of 500 grams per container. Over filling or under filling presents a serious problem and when detected requires the operator to shut down the production line to readjust the filling mechanism.
A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination.
A random sample of size 16 is chosen from a population and a 90% confidence interval for the standard deviation will be determined. What value of should be located in the chi-square distribution table?
Four students each received a raw score of 22 on a different test. Compute the z-score for the raw score value of 22 for each student, given information about the distributions of X values for each test.
A study was conducted to determine whether magnets were effective in treating pain. The valves represent pain measurements.
The grade point averages for 10 randomly selected high school students are listed below. Assume the grade point averages are normally distributed.
Assume the data for the three groups are independent and the data are approximately Normal. The P-value is less than 0.01. The correct conclusion is that
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