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A certain probability density function is made up of two straight-line segments. The first segment begins at the origin and goes to the point (1,1). The second segment goes from (1,1) to the point (x, 1). Sketch the distribution function, and determine what x has to be in order to be a legitimate density curve.
Reject H0 at β β = .01; there is evidence of a difference between the mean voter turnouts for urban, suburban, and rural precincts.
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level.
If the writing scores for the population have a standard deviation of σ = 20, does the sample provide enough evidence to conclude that the new composition course has a significant effect?
Is there evidence of a significant difference in the proportion who get their news primarily from newspapers between those 36 to 50 years old and those above 50 years old? (use α = 0.05)
In patients with congestive heart failure, two or more drugs were prescribed in 257 of 437 U.S. patients. In Scotland, 39 of 179 patients had two or more drugs prescribed
Suppose 80% of kids who visit a doctor have a fever, and 20% of kids with a fever have a sore throats. What's the probability that a kid who goes to the doctor has a fever and a sore throat?
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows:
Explain thoroughly, the concept of standard deviation. How does range affect standard deviation? What is a z-score, and how do z-scores relate to the mean of a set of data?
The following regression equation and correlation coefficient were calculated using minitab for the bivariate data age of men and their weight.
Find the probability of an untrained dog performing as well as Maggie. Is it unusual for an untrained dog to do as well as Maggie?
Set up the following null and alternative hypotheses for both factors and their interaction. You should have three verbal statements, not symbolized statements.
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