name the appropriate inference procedure, and write the hypotheses.
name the appropriate inference procedure, and write the hypotheses.
DO NOT ACTUALLY WORK OUT THESE FIRST 4 PROBLEMS.
there are 2 bacteria
this chart applies to both
Specimen
1 2 3 4 5 6 7 8
Method
A 22.7 23.6 24.0 27.1 27.4 27.8 34.4 35.2
B 23.0 23.1 23.7 26.5 26.6 27.1 33.2 35.0
Bacteria 1 Investigators at the U.S. Department of Agriculture wished to compare methods of determining the
level of bacterial contamination in beef. Two different methods (A and B) of determining the level of
contamination were used on each of eight 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.
Bacteria 2 Investigators at the U.S. Department of Agriculture wished to compare methods of determining the
level of bacterial contamination in beef. Two different methods (A and B) of determining the level of
contamination were tested. Sixteen randomly selected specimens of a certain type of beef were used in this
study – eight of them were randomly assigned to be tested with method A, and the remaining eight were tested
with method B. The data obtained, in millimicrobes/liter of ground beef, for each of the methods are shown in
the table below.
Is there a significant difference in the mean amount of bacteria detected by the two methods for this type of
beef? Provide a statistical justification at the α = 0.05 level to support your answer.
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