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The number of lightning strikes on a square kilometer of open ground in a year has a mean of 6 and a standard deviation of 2.4. Counts of strikes on separate areas are independent. The Ntional Lightning Detection Newtowk uses automatic sensors to watch for lightning in areas of 10 square kilometers.
What are the mean and standard deviation of the total number of lightning strikes observed?
What are the mean and standard deviation of the mean number of strikes per square kilometer?
How does multilinear regression analysis apply to a profession? Specify the dependent value and the set of predictors. Where would you get the data?
Discuss the concept of statistical significance, including your understanding of what it means, why it is important, and how it can be used.
The grades of 20 students are listed in the stem and leaf diagram below. What is the probability of randomly selected student to have a grade more than or equal to 60 and less than or equal to 80.
In a study relating the amounts of time required for room service delivery at a newly opened Radisson Hotel, 20 deliveries had a mean time of 24.2 min and a standard deviation of 8.7 min. The sample data appears to have a bell-shaped distribution...
Draw the graph of the regression line on the same plot as the scatter diagram above.
If a population distribution is skewed to the right, then given a random sample from that population, one would expect that the. median is greater than the mean.
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
A marketing survey is taken among fast food customers to determine their preference for hot dogs or pizza. Of the 200 respondents selected,
what is the probability that an organization selected at random will have at least one of the three types of benefits?
State the research question and statistical null and alternative hypotheses; and Explain why this test is appropriate and why the correlation, t-test, regression, or ANOVA is not appropriate.
The following is a time series data set. Run a time-series analysis for projections of April 2009 in the Healthcare industry of Nashville.
Using your workplace, present or prior, or an organization with which you are affiliated, identify a quantitative and a qualitative variable of interest to you.
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