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The 47 students on a computer studies course each recorded the number of whole minutes, x, spent surfing the internet during a given day. The results are summarised below:∑x = 2276 , ∑x² = 111492
a) Find the mean μ.b) Find the standard deviation SD = σx
Can you please describe what I need to do to complete this? I do not understand how to plot the figures within the spreadsheet or calculate them.
A sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes? (Round your answer to 4 decimal places.)
Which of the following events are disjoint and What proportion of the females rated their intelligence less than 7.
Six people have declared their intentions to run for a county commission seat in the next general election. A political poll is conducted three-quarters of the way into the campaign to determine if there are any clear preferences on the part of th..
Explain the main differences among integers, rational numbers, real numbers, and irrational numbers. How are these used in everyday life? How would you explain the use of each to someone who did not know about the differences?
How many data points can she use in a regression analysis using the data provided.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
Compute the value of the sample correlation coefficient between weekly sales and shelf space. Is the correlation between weekly sales and shelf space significant at the .01 level of significance? What is the estimated regression equation?
Easy-Fly Airline took a random sample of 25 flights to determine if the mean time it takes for luggage to reach the travelers departing from a flight is less than 15 minutes. The sample mean was found to be 13.8 minutes with a standard deviation o..
A researcher looks at the effect of 3 different drugs on 3 different groups of 10 people. Numbers refer to stress levels, with lower numbers being lower stress.
Develop three regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
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