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A manufacturer claims that the life span of its tires is 52,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of the tires are normally distributed. You select 100 tires at random and test them. The mean life span is 51,853 miles. Assume = 700. Assuming the manufacturer's claim is correct, what is the probability that the mean of the sample is 51,853 miles or less?
A motor transport company has 50 similar buses. The management suspects that its control of these vehicles is inadequate. What suggestions could you make for investigating vehicle use, and tightening managerial control over the company?
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
The quality-control inspector checks 200 pieces in a certain operation. The piece is either good or defective. The record for nine hours.
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Define the variable - the weight in pounds - it is a dependent variable. Find the mean, median, mode, variance, and standard deviation for your data.
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments.
Suppose 10 balls, numbered 1-10, are to be distributed randomly into 10 boxes. a) What is the probability all 10 balls are placed into one box? b) What is the probability that no boxes are empty?
Determine the cost Xs to develop the support system for which the probability of exceeding Xs is equal to 0.01?
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Explain.
Determine the following probabilities: Events A and B are mutually exclusive events defined on common sample space.
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
The NY Dept of Motor Vehicles (DMV) designs its license plates with space for 7 letters or numerals. In the most recent iteration, the DMV uses three letters followed by 4 numbers.
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