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A tire manufacturer wants to determine the inner diameter of a certain grade of tire. Ideally, the diameter would be 570 mm. The data are as follows:
572, 572, 573, 568, 569, 575, 565, 570.
(a) Find the sample mean and median.
(b) Find the sample variance, standard deviation, and range.
(c) Using the calculated statistics in parts (a) and (b), can you comment on the quality of the tires?
the mean score of a college entrance test is 500 the standard deviation is 75. the scores are normally distributed.
A random sample of 80 students is selected for a particular study. What is the probability that the sample proportion (the proportion living in the dormitories) is between 0.30 and 0.50?
a score that is 6 points below the mean corresponds to a z- score of z -0.50. what is the population standard
20% of their customers purchase package 3 and 25% of their customers purchase package 4. Find the expected value or average profit per customer.
test 1answer the following three questions based on what you know about statistics now.1. what is statistics?2. how is
Which of the following statistical inference procedure should we use?
A standard deviation of 36 donuts. If a sample of 16 stores results in a sample average of 249 donuts what is the standard error of the mean?
would this prove that they are exceeding their goal, using α = .025?
If you draw one ball from the urn what is the probability that it is blue or white?
Standard deviation of 0.17 ounces, assuming the weight of cereal is normally distributed, determine the likelihood that a package will contain more than 12.2 ounces?
1.a restaurant monitors its customers complaints. here are the percent of customers with the following complaintswith
Find the percentage of the total variation that cant explained by the linear relationship between the two variable.
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