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The director of the campus-computing center did a study to determine the patterns of student computer usage. He found that 15% of the total student computer hours occurred during the first 5 weeks of the term, 25% during the middle five weeks, and 60% during the last 5 weeks. Would a time-series graph of this data be appropriate? Give a reason for your answer.
No. A time-series graph is not ideal for data collected over periods of longer than a week.No. A time-series graph is not ideal for fewer than 10 events or categories of data.Yes. A time-series graph identifies the frequency of events or categories in increasing order of occurrence.Yes. A time-series graph would show how student usage of the computer lab varies during the term.Yes. A time-series graph represents data that make up parts of a whole.
11% of all books sold are romance genre. If the bookstore sells 316 books on a given day, what is the probability that fewer than 40 are romances, at least 25 are romances, between 25 and 40 are romances?
Assuming that the Poisson distribution is a plausible model in describing variability of asbestos fiber counts in filters; derive a 95% confidence interval indicating the variability in the average number in asbestos fibers.
School seniors in his random sample, 159 believe that "getting rich" is an important goal. Can he conclude, at the 0.05 level of significance, that the proportion has indeed changed?
Estimate the 95% confidence interval for the proportion of the electorate that support this policy.
Correlation based on Scatter Plot - Draw the scatter plot for the variables.
Set up null hypothesis for associated F test.
Suppose that the population of heights of female college students is approximately normally distributed with mean m of 66.24 inches and standard deviation s of 5.07 inches.
Researchers are studying the absorption of two drugs into the bloodstream. Each drug is to be injected at three dosages. There are 24 people in the study, and they are randomly divided into six groups.
The Internal Revenue Service plans to examine an SRS of individual federal income tax returns from each state. One variable of interest is the proportion of returns claiming itemized deductions.
Concept of statistical signi cance
Briefly describe your experiment. You must have a valid and ethical experiment (NOT an observational study) and/or question.
Prepare an ANOVA table and test the null hypothesis of no linear relationship between the two variables.
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