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Suppose data were collected on the number of customers that frequented a grocery stores on randomly selected days before and after the governor of the state declared a lock down due to COVID 19. A sample of 6 days before the lockdown were chosen as well as 6 days randomly chosen after the lock down was in place. The number of shoppers each day were as follows:
This is interval/ratio data because they are characteristics of the days.
a. Can these results be generalized? To whom?
b. Can cause and effect statements be made? Explain.
c. Calculate accountable, unaccountable, and total variation. Show your work.
d. Eta square is accountable variation divided by total variation. Determine eta square. It is interpreted as the variation in the dependent variable that can be accounted for by the independent variable. Describe eta square in terms of this problem.
Sketch the areas under the standard normal curve over the indicated intervals, and find the specified areas.
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At a = 0.05 and 0.10, test the hypothesis that the proportion of Consumer (CON) industry companies winter quarter profit growth is more than 2 percentage
it is known that the number of people who enter a bank during a time interval of t minutes is a poisson random variable
Using the appropriate statistical table, what is the most accurate statement we can make about the p-value for the test?
a box contains 4 blue marbles 1 red marbles and 6 green marbles. two marbles are selected at random from the box. if x
Perform a hypothesis test (comparing means) on the two populations below. Assume equal means and normal distribution.
Suppose we generate a random variable X in the following way. First we ?ip a fair coin. If the coin is heads, take X to have a Unif(0,1) distribution. If the coin is tails, take X to have a Unif(3,4) distribution.
To estimate the number of calories in a cup of diced chicken breast meat, the number of calories in a sample of four separate cups of meat is measured.
Compute the Mann-Whitney U test statistic.- Make a decision regarding the null hypothesis. Is there a significant difference in the class ranks of men and women?
Compare and contrast the characteristics of parametric and non-parametric test methodologies. Give examples of when to use each.
Define "epigenetic" and "epitasis", and give a unique example of each. Then discuss how nature, nurture and evolution affect the development of an individual
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