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The most famous geyser in the world, old faithful in yellow stone national park, has a mean time between eruptions of 85 minuntes. if the interval of tiem between eruptions is normally distributed with standard deviation 21.25, then whats the probability that a randomly selected time interval between eruptions is longer than 95 minuntes.
Normally distributed with mean equal to 15,000 and standard deviation equal to 1000. What is the lowest income among the richest 250 persons?
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
Discuss how you would investigate the operations of the plant to determine why the proportions were off the targeted values. Speculate on three or more possible conditions in plant and bagging process that could have caused the observed results.
Find a z score for which the area under the standard normal curve from -z to z is 50%. (b) Find the range of scores which will be assigned a grade of C.
A recent research report shows that the percentage of college students who have been reported for plagiarizing has reached 30% each in the colleges of Education, Arts and Sciences, and Business, but only 10% in the School of Law.
The accompanying two histograms represent the distribution of acceptance rates (percent accepted) among 25 business schools in 1995. The histograms use different class intervals, but are based on the same data. In each class interval, the left endpoi..
Your customers have been divided into 3 groups. The first group represents 15% of customers, and these customers spent an average of $29.76 last year.
Consider a hypothesis test that uses a 0.05 significance level to test the claim that the mean body tem of the population is less than 98.6
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
What is an interaction? Describe an example and identify the variables within your population (work, social, academic, etc.) for which you might expect interactions?
Does the data set represent a sample or a population? If it is a sample, describe the population from which it has been drawn.
Do the data in the sample represented in the Excel file support his contention at the .05 level of significance?
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