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Load the auto-mpg sample dataset from the UCI Machine Learning Repository (auto-mpg.data) into Python using a Pandas dataframe. The horsepower feature has a few missing values with a ? - replace these with a NaN from NumPy, and calculate summary statistics for each numerical column (Hint: Use an Imputer from Scikit). Replace the missing values with the overall mean, median, and mode (Hint: Pandas makes this easy) - and calculate the variance of the feature. What imputation results in the lowest variance? Why? Is there a different method of imputing values that would match the distribution more accurately? Describe your method.
Will the between-treatments estimate of variability be larger or smaller than the between-treatments estimate of variability of four means drawn from a population with μ = 100?
A sample of 25 units yields a sample mean of 14 and a sample standard deviation of 4.32. Do we have statistical significance if our alpha value is .05?
What is the 95% confidence interval for the number of chocolate chips per cookie for Big Chip cookies?
Number of rescue calls received by rescue squad in city follows a Poisson distribution with mu = 2.83 per day. Squad can handle at most four calls a day. Determine the probability that squad will be able to handle all calls on a particular day?
Based on the scale of measurement for each variable listed below, which measure of central tendency is most appropriate for describing the data?
Import the given Module 3 Application Data Set into SPSS, and then identify all of the errors in the imported SPSS file.
At the end of the campaign, a random sample of 5,000 consumers shows that 19% of them now prefer California wines. Conduct the test at α = 0.05.
An ambulance service receives an average of 15 calls per day during the time period 6 p.m. to 6 a.m. for assistance.
a. Draw a probability tree for this situation. b. Find the probability of increasing both sales and customers.
Let X be a random variable having expected value (mu) and variance (sigma)^2. Find the expected value and variance of: Y = (X - μ)/(σ).
In your own words, describe the role of statistics in the research process. Using the wheel of science as a framework, explain how statistics
a multiple regression line was calculated in which x1 was a students grade point average and x2 was a students age. the
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