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Contamination of various food products is an ongoing problem all over the world. The article "Prevalence and Quantitative Detection of Salmonella in Retail Raw Chicken in Shaanxi, China" (J. of Food Production, 2013) reported the following data on the occurrence of salmonella in chicken of three different types: (1) supermarket chilled, (2) supermarket frozen, and (3) wet market fresh slaughtered.
Does it appear that the incidence rate of salmonella occurrence depends on the type of chicken? State and test the appropriate hypotheses using a significance level of .05.
What is a regression analysis? What is a regression coefficient? What is the Greek symbol for regression coefficient? What is the purpose of testing the statistical significance of a regression coefficient
Harry's hamberger is a restaurant where customers form a single line for 1 cashier. The average numbers of arrivals is 1 per minute and the Poison distribution accurately defines this rate.
There are many examples of the role of noise in human communications. One story concerns a communication exchange which purportedly took place during the First World War.
The mean, standard deviation, variance, and range for perceived learning variable.
Weights of newborn babies in the United States are normally distributed with a mean of 3425 grams and a standard deviation of 495 grams. A newborn weighing less than 2200 grams is considered to be at risk. What fraction of newborn babies are in th..
a sample of data on daily prices of three petrol stations over a two week period have been collected in the table
Cholesterol levels for women follow a normal distribution with mean = 185 mg/dL and standard deviation = 50 mg/dL. What percent of women have cholesterol levels above 240?
1. The owner of a ?eet of taxi cabs wants to determine if there is a difference in the lifetime of two different brands of car batteries used in the ?eet of cabs. State the appropriate null and alternative hypotheses.
A random sample of 200 workers from Factory A showed that 130 were satisfied with their job. Formulate and test the appropriate hypotheses at the 1% level of significance
you measure the lifetime of a random sample of 64 tires of a certain brand. the sample mean is x 50 months. suppose
the length of an injection-molded plastic case that holds magnetic tape is normally distributed with a length of 90.2
Use a 0.01 significance level to test the claim that the selection process is biased against Americans of Mexican ancestry. Does the jury selection system appear to be fair?
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