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The alkalinity level of water specimens collected from the Han River in Seoul, Korea, has a mean of 50 milligrams per liter and a standard deviation of 3.2 milligrams per liter. Assume the distribution of alkalinity levels is approximately normal and find the the probability that a water specimen collected from the river has a alkalinity level below 55 milligrams per liter.
answer the following if the correlation coefficient is -0.53 what is the sign of the slope of the regression
During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. 80% of the households spent more than what amount?
Random sample of 85 group leaders, spent 6.5 years on job before being promoted standard deviation of sample was 1.7 years create 95 percent confience interval.
hw5 logistic regression1. nbspmarentette and el-masri 2011 used logistic regression to identify predictors of obtaining
the random variables x and y have expected values 8 and 25 standard deviations 4 and 9 respectively.a calculate the
Test the hypothesis that no difference exists between the groups at α = .05 and perform and report all related tests and statistics.
What different types of variables are used in quantitative studies? Describe each type of variable and how they differ.
Is there clear evidence of any difference in electrical response to light flash between uninfected and infected rat eyes (at any stage of the disease)?
Use a visual display to a categorical variable with four classifications. Which one would you use - the bar chart, the pie chart, or the pareto diagram? Explain"
To develop 3-month and 2-month moving average for the time series.The following data represents demand for company ABC's products for the last 10 months.
Using this test 80% of Down's syndrome cases can be identified at birth, while 5% of normals are detected as positive. a. What is the sensitivity and specificity of the test?
Show the sampling distribution of p if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
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