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Old Faithful Geyser: Time intervals (in minutes) between eruptions of Old faithful geyser in Yellowstone National Park:
98 92 95 87 96 90
65 92 95 93 98 94
The number of choco chips in an 18 ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1256 and a standard deviation of 129 chips, What is the probability that a randomly selected bag contains fewer than 1000 c..
an oil firm plans to drill 20 wells each having probability 0.2 of striking oil. each well costs 20000 to drill a well
Use the histogram to determine how many points are out of control according to the upper control limit and lower control limit.
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
No Gulf View condominium with a list price of $285,000. What is your estimate of the final selling price and number of days required to sell each of these units?
Sample of 81 business students over a one-week period. Assume the population standard deviation is 1.8 hours. with a ,95 probability, the margin of error is approximately.
in an experiment to study the relationship of hypertension and smoking habits the following data are collected for 180
A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for ..
T-scores are used on some psychological tests, such as the MMPI. T-scores have a mean of 50 and a standard deviation of 10, and therefore a z-score of -1 (one standard deviation below the mean) would be converted to a T-score of 40.
Calculate the among groups degrees of freedom, determine if the mean ratios for the four neighborhoods are the same?
Compare the means of two populations using 96% confidence interval:
Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 406 jawbreakers that weigh more than .4 ounces?
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