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A random sample of 13 DVD movies had a mean length of 119.4 minutes, with a standard deviation of 73.8 minutes. Find the lower bound of the 90% confidence interval for the true mean length of all Hollywood movies. Assume movie lengths to be approximately normally distributed.
If three of the vacancies were chosen at random, calculate the probability that two of the vacancies cost at most $4,000 to fill.
A certain single-server system has been simulated, with the following sequence of waiting times before service for the respective customers. Use the regenerative method to obtain a point estimate and 90 percent confidence interval for the steady-s..
Suppose that 20% of the population has high blood pressure. If 7 people are randomly selected off the street, what is the probability that more than 4 of them do not have high blood pressure?
A check of dorm rooms on a large college campuses revealed that 38% had refrigerators, 52 percent had TVs and 21 percent had both a TV and a refrigerator. What's the probability that a randomly selected dorm room has.
Given the executives' subjective probabilities for the three possible states of industry growth, what will be the company's expected profit if it chooses not to renovate the plant?
For how many integers from 1 through 10 can the natural alogarithms be approximated given that ln2 ≈ 0.6931, ln3 ≈ 1.0986, and ln5 ≈ 1.6094? Use the laws and rules of logarithms to approximate these logarithms ( DO NOT USE A CALCULATOR). Explain..
consider the question what is the probability of getting a 6-card poker hand that contains a card from all four suits
What proportion of municipal bonds is issued by suburbs and What is the probability that a randomly selected visit will last between 60 and 90 minutes?
the qualifying speed for a championship race is 145.65 mph and the standard deviation is 9.45 mph. only drivers who
Do motivation levels between upper-level (group 1) and mid-level (group 2) managers differ? Use the information below to answer the following questions.
Suppose that get-tough programs as described in the previous exercises actually are beneficial, and a study erroneously concludes that they do nothing
What is the approximate p-value for this test? Construct and interpret the 99% confidence interval for the difference between the population means.
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