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Problem - Math pretest predicts success? Can a pretest on mathematics skills predict success in a statistics course? The 82 students in an introductory statistics class took a pretest at the beginning of the semester. The least-squares regression line for predicting the score y on the final exam from the pretest score x was = 16.23 + 0.82x. The standard error of b1 was 0.38.
(a) Test the null hypothesis that there is no linear relationship between the pretest score and the score on the final exam against the two-sided alternative.
(b) Would you reject this null hypothesis versus the one-sided alternative that the slope is positive? Explain your answer.
a wildlife study has found that a wolf pack is successful in killing one large animal for every 12 that it chases.a
An upper-level sociology class at a large urban university has 120 students, including 34 seniors, 57 juniors, 22 sophomores and 7 freshmen.
What is the probability that there will be no shark attacks?- What is the probability that between two and five shark attacks inclusive will occur?
A committee is evaluating six equally qualified candidates for a job. Only three of the six will be invited for an interview; among the chosen three.
A university teacher saved every e-mail received from students in a large Introductory Statistics class during an entire term.
You will be evaluating formal and informal policies throughout your career in Criminal Justice, whether you are working in policing, courts, corrections, or in some other capacity. Thus, each student in this class is expected to identify a crimin..
The following set of data represents the number of hospitals for selected states. Find the mean, median, mode, midrange, range, variance, and standard deviation for the data?
There used to be an ad on TV that claimed one toothpaste was proven to be more effective in fighting tooth decay than another. One of statistics professors was interested in the study, and after 6 ads finally got the address to write away for it f..
The monthly utility bills are normally distributed with a mean value of $130 and a standard deviation of $15.
Assume the wages are normally distributed with a standard deviation of $0.45. If a worker at this car wash is selected at random, what is the probability that the worker earns more than $6.75?
Describe how you can use James-Stein (JS) theory to provide more reliable estimates of the expected returns of non-stock indices
If the code does not start with a vowel, then there must be 2 consecutive positions in the code which contain the same vowel. (For instance, both baal and blaa are acceptable codes.)
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