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A researcher evaluates a gun training program in a large American city found that rapes dropped by 90% in the year following the training. Researchers looking at the same data but expanding the time frame to include 5 years before the training and 5 years after the training found that the rape rate in the same city had fluctuated wildly over that decade including zero rapes being recorded in the city two years before the gun training was implemented. Thirty years after this research advocates still cite the first study and ignore the second study. What's the moral of this story?
a machine manufactures parts whose diameters vary according to the normal distribution with the mean 40.150 mm and the
a fitted model with more predictors will necessarily have a lower training set error than a model with fewer
A random sample of 51 observations was selected from a normally distributed population. The sample mean was x = 88.6 , and the sample variance was s2 = 38.2.
How Large a sample is needed to estimate the true proportion of homeowners who have vegetable gardens to within 3 percentage point 92% confidence.
How does bell-shaped curve for sampling distribution of sample means for samples of size n =120 compare tobell-shaped curve for sampling distribution of sample means for samples of size n =95?
The probability that home sales will increase in the next 6 months is 0.25. The probability that the interest rates on loans will go up in the same period is estimated to be 0.74.
A sample of 24 is known to come either from a uniform distribution over the interval (0, 10) or else from a symmetric triangular distribution over the same interval (0, 10). The sample values are
An experiment studied the effects of starch source, starch concentration, and temperature on the strength of gels. This experiment was completely randomized with sixteen units.
a student club has 40 members including stacy and tom.a in how many ways can the club elect different individuals to
coefficient of variation and standard deviation are two measures of dispersion or spread among the data values. lets
Identify a new law or regulation that affects the practice of public health or community health nursing. Discover the sponsor of the action. Using news reports, statements in the public record, personal telephone or other interview data, outline t..
Is there a difference between the two sample proportions? (Conduct a two sample proportion test with significance level 0.05). Is there an association between being harassed online and in person? (significant level 0.05)
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