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Problem: You wish to estimate the average number of customers that shop in your store every day. You know that the standard deviation of this distribution is 30. You monitor the daily number of costumers for 50 days, and find out that the average across those 50 days was 92 customers
Required:
Question 1: Calculate a 95% confidence interval for the average daily number of shoppers.
Question 2: Now assume that ya don't know the standard deviation of the population. You estimate it based on the sample you have gathered, and you find that it is 22.
Question 3: Calculate now a 95% confidence interval for the average daily number of shoppers
a company excavates gold and silver from 2 different mines. each hour that the company operates in mine 1 produces 2 kg
Determine the following: the quartiles for a uniform random variable whose range is from 4 to 20.
Empirical research was conducted to investigate the variables that impact the size distribution of manufacturing firms in international markets (World Development, Vol. 20,1992).
To study the impact of the crisis on different cultural sectors, you have collected information on the number of performances from several artists
Read George the III's letter. What is his main theme in the letter? What is his determination about the results of the war in terms of commerce?
Summarize the data graphically and numerically. Give reasons for the methods you chose to use in your summaries.
Conduct an analysis of variance test to determine whether there is any evidence to suggest that at least two of the population mean weights are different. Use a = 0.01.
After treatment is administered to individuals in sample, sample mean is found to be M = 55. Determine Cohen's d measure effect size for both tests (σ = 20 and σ = 10).
Was it evidence of a problem in the area, or was it a chance? Can you verify this? Would Binomial or Poisson distribution be suitable for modeling this case?
The rate of defects among CD players of a certain brand is 1.1%. Use the Poisson approximation to the binomial distribution to find the probability that among 240 such CD players received by a store, there is at most one defective CD player.
Web-based exercise. Results from the Behavioral Risk Factor Surveillance System (BRFSS) can be found at apps.nccd.cdc.gov/brfss/.
Set up the hypotheses to test whether the average life expectancy of female Bostonians is higher than that of male Bostonians.
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