A scientist took a random sample of 50 1 LB packages of ground turkey and subjected half them to one irradiation method and the other half to another irradiation method. The bacteria count was measured and sample statistics were calculated (data below in billions). Run the appropriate test to see if method 1 is better. Method n mean sd 1 25 10 4 2 25 12 2.5 What is your test statistic?
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A scientist took a random sample of 30 1 LB packages of ground turkey and subjected half of them to irradiation method 1 and the other half to irradiation method 2. The bacteria count was measured and sample statistics were calculated (standard deviations were 4 and 2 respectively) were calculated. (Note: Less bacteria would be better) What would be the most appropriate test to see if method 1 is better? My parameter of interest here would be: The direction of test would be:
Aishwarya K.
In recent years the irradiation of food to reduce bacteria and preserve the food longer has become more common. A company that performs this service has developed four different methods of irradiating food. To determine which is best, it conducts an experiment where different foods are irradiated and the bacteria count is measured. As part of the experiment the following foods are irradiated: beef, chicken, turkey, eggs, and milk. The results are shown below. Bacteria Count Food Method 1 Method 2 Method 3 Method 4 Beef 47 53 36 68 Chicken 53 61 48 75 Turkey 68 85 55 45 Eggs 25 24 20 27 Milk 44 48 38 46 Can the company infer at the 1% significance level that differences in the bacteria count exist among the four irradiation methods? Can the company infer at the 1% significance level that differences in the bacteria count exist among the different types of food?
Sheryl E.
MAT 1450 – Unit 12 Written HW 1. Investigators at the U.S. Department of Agriculture wished to compare methods of determining the level of E. coli bacteria contamination in beef. Two different methods (A and B) of determining the level of contamination were used on each of ten randomly selected specimens of a certain type of beef. The data obtained, in millimicrobes/liter of ground beef, for each of the methods are shown in the table below. Specimen 1 2 3 4 5 6 7 8 9 10 Method A: 22.7 23.6 24.0 27.1 27.4 27.8 34.4 35.2 40.4 46.8 Method B: 23.0 23.1 23.7 26.5 26.6 27.1 33.2 35.0 40.5 47.8 Is there a significant difference in the mean amount of E. coli bacteria is detected by the two methods for this type of beef? Provide a statistical justification to support your answer by performing a hypothesis test at the 0.05 significance level. (Hint: List out the steps of PHANTOMS to help you through the process. Briefly list off and check the assumptions since you can use your notes on this assignment.)
Madhur L.
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