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A marketing research firm is interested in determining whether there is difference between households in Chicago and Milwaukee in the degree that they purchase groceries online. The research firm decided to randomly sample household earners with income of $50,000 per year in the two cities and ask them had they purchased groceries online during the last year. The results of the survey showed that of the 150 sampled in CHicago 19 and yes which in Milwaukee of 135 sampled 10 said yes.
Construct a 95% Confidence interval for diffrence between the two populations. At the alpha equals .10 level of significance, can the firm conclude that Chicago households buy more online than Milwaukee.
Do a formal Hypothesis test.
We are asked to investigate the hypothesis that the number of crimes is related to police expenditures because states with higher crime rates are likely to increase their police force, thereby spending more on the number of officers on the street.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval
Given the following ordered data pairs (x, y), compute the value of the linear correlation coefficient r: (2,6) (3,0) (5,15) (5,5) (10,2).
Use the binomial distribution in the Data Analysis add - in to simulate the distribution of men and women among the next ten arrivals at an emergency room, assuming that, on average, six people out of ten who arrive are men.
Utilizing the .05 level, do the results support the psychologists' theory. Elucidate your answer to somebody whom has never had a course in statistics.
A random sample of 180 full-grown lobsters had a mean weight of 16 ounces and a standard deviation of 3.0 ounces. Construct a 98 percent confidence interval for the population mean.
A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for ..
In this assignment, you develop two purpose statements using the same data set (different purposes, same data) and will use regression and two sample hypothesis testing to analyze the same set of data. For example, you may want to determine if there ..
What is the expected number of students who have registered on a pass/fail basis? What is the probability that more than three are registered on a pass/fail basis?
Researcher wants to estimate in $300 true average amount of money country spends on road repairs each year. If she wishes to be 90% confident, how large sample is essential?
Below are revenue and profit (both in $ billions) for nine large entertainment companies. Make and display a scatter plot of profit (Y) as a function of revenue (X).
Tom Smith wants to test the hypothesis that adult men have a mean weight that is greater than 150 pounds. Tom surveys the adult male members of his family and obtains 40 sample values
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