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The number of cars passing a checkpoint is treated by a consulting firm as having a poisson distribution with a mean of 20 per minute. What does the firm consider the standard deviation in interarrival times to be?
Search the internet for real-life examples of probability. As a hint, type "probability" followed by a topic of interest to you into the search engine
A population has a mean = 80, with standard deviation = 8. The distribution of sample means for samples of size n = 4 selected from this population would have an expected value of?
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
Calculate Probability in Normal Distribution and Standard Scores in a Random Variable
Test whether it has been an improvement, at level of signi?cance a = 0.01. First, write out the expres- sion for the exact determination of the cut-off point, and secondly, use the CLT for its numerical determination.
When studying simultaneous responses to two categorical questions, we should set up a a) contingency table. b) frequency distribution.
How is data screening related to the assumptions of the statistic you will choose to analyze your data?
a. Using 11 classes, construct a cumulative frequency distribution. b. Determine the proportion of CFO salaries that are at least $175,000. c. Determine the proportion of CFO salaries that are less than $205,000 and at least $135,000.
Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census.
A researcher has been measuring the time for pairs of 8 year olds who have just met each other to work together to solve a problem. Construct a distribution table for these data. include the colums and values for proportion and percentage.
Given that 800 people were aged between 25 and 40, approximately how many had a systolic blood pressure reading greater than 140 and less than or equal to 150?
There were about 15 flu cases per week, this flu season, in the Oshkosh school system.
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