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Question: Find statistical summaries for two quantitative university data sets of your own choosing, related to your work, firm, or industry group. For each data set:
a. Compute the average, the median, and a mode.
b. For each of these summaries, explain what it tells you about the data set and the business situation.
c. Construct a histogram, and indicate these three summary measures on the horizontal axis. Comment on the distribution shape and the relationship between the histogram and the summaries.
d. Construct the box plot and comment on the costs and benefits of having details (the histogram) as compared to having a bigger picture (the box plot).
List two ways in which statisticians use the word independence or independent with respect to concepts introduced earlier in this book.
How many standard deviations is the sample proportion from the mean of the distribution of sample proportions?
Assuming the sample size of 40 can be considered as large, compute the confidence interval for a confidence level of 90%.
What is the probability that the transmission delay is less than 57 milliseconds? P(x
The researcher was interested in how well what he/she manipulated predicts how happy subjects feel at the end of the procedure. Using the data below, calculate the regression constants and present the equation for the regression line.
Indicate whether the appropriate test will be one-tail or two-tail, then sketch a diagram that shows the approximate location of the "rejection" region(s) for the test.
then lengths of a certain component are normally distributed with a mean of 250 mm and a standard deviation of .6mm.
What are different methods of graphical representation of data? Explain them. Distinguish Histogram and Histogram clearly with illustrations.
For a sample of 35 items from a population for which the standard deviation is σ = 20.5 the sample mean is 458.0. At the 0.05 level of significance, test H0:μ=450 versus H1 : μ ≠ 450. Determine and interpret the p-value for the test.
What is the process through which we can calculate a line that goes through a scatter plot with a linear pattern?
What is a measure of central tendency? Distinguish between the mean, median, and mode.- What is a measure of variability? Distinguish between the standard deviation and the range.
Using one proportion z test to find whether or not to support the claim - There is little evidence to reject H 0 , therefore they conclude the tvs are 20 pounds on average.
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