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A tire manufacturer claims that the lives of its tires are normally distributed and will last an average of 60,000 miles with a standard deviation of 3,000 miles. Sixty-four randomly selected tires were tested and the average miles were the tire failed were recorded. What is the probability that the mean miles recorded when the tires failed will be more than 59,500 miles?
Test whether race and NATFAE are independent (α = 0.05). What do you conclude?
The mean area of several thousand apartments in a new development is advertised to be 1250 sq. ft. An engineer measured a random sample of apartments:
Construct a 99% confidence interval for the mean time taken by all statistics students to solve the computer assignment.
Adele Weiss manages the campus flower shop. Flowers must be ordered three days in advance from her supplier in Mexico. Advance sales are so small that Weiss has no way to estimate the demand for the red roses.
In ANOVA, what does F=1 mean? What are the differences between a two sample t-test and ANOVA hypothesis testing?
Describe the following correlation. The students with the highest grades in written French were also the students with the highest grade in spoken French.
Determine probability that number of boats constructed next month will be between 4 and 7 (both inclusive).
How should the candidate purchase the five commercials to maximize the estimated number of additional voters?
Checking the output by almost continuous sampling since the abnormal condition began. What is the probability that in a sample of 10 pieces: Exactly 5 will be defective?
Explain whether the symmetry definition of probability is appropriate with respect to the outcomes in the sample space.
SOB's systolic blood pressure is a random variable with a mean of 145 mmHG and a standard deviation of 20mmHG. If the SOB's blood pressure is taken at a randomly chosen moment
How large a sample should be selected in order to estimate the population proportion to within a margin of error of 0.02 with 97% confidence. The sample proportion from the preliminary sample was 0.18.
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