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The standard deviation is defined to be the square root of the variance.
1) Explain why it is conventional to take the square root using the following set of measurements of pH in Waller Creek to illustrate your logic: pH measurements: 7.34 7.48 7.12 7.33 7.28 7.41 7.22 7.37 7.30 7.29
Explain how many cars would required to go by the speed trap to be 99.8% sure which at least one driver will warm oncoming traffic of the speed trap.
Using test data on 20 types of laundry detergent, an analyst fitted a regression to predict CostPerLoad (average cost per load in cents per load) using binary predictors.
1. an insecticide company exposes 10000 cockroaches to its newest product and exposes another 10000 to their previous
only 27 of us adults get enough leisure time exercise to achieve cardiovascular fitness. choose 3 adults at random find
Given that x and y are both positive, solve the simultaneous equations.
Assume the data have bell shaped distribution with a mean of 30 and a standard deviation of 5. Employ the empirical rule to determine the percentage of data within each of the following ranges: 20 to 40, 15 to 45, and 25 to 35.
identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect
Data collection instrument used in managerial research. Why is it significant to make sure that these data collection methods and instruments are both reliable and valid?
The mean weight of newborn babies in a Long Island Community is 7.5 lbs with a standard deviation of 1.4 lbs. What is the probability that a random sample of 49 babies has a sample mean weight of at least 7.2lbs?
question a grocery store is hiring 5 new stock-persons for the summer. 19 equally qualified students apply for the job.
Identity Probability Distributions. In this exercise, determine whether a probability distribution is given. In the case where a probability distribution is not described
Medical studies have shown that 10 out of 100 adults have heart disease. When a person with heart disease is given an EKG test, a 0.9 probability exists that the test will indicate the presence of heart disease.
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