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A recent study compared the time spent together by single and dual-earner couples. According to the records kept during the study, the mean amount of time spent together watching TV among single-earner couples was 55 minutes per day, with a standard deviation of 15.5 minutes. For the dual-earner couples, the mean time was 48.4 and the standard deviation was 18.1. At a 0.01 significance level, can we conclude that the single-earner couples on average spend more time watching TV together? There were 12 single-earner and 12 dual-earner couples studied. State the decision rule, the value of the test statistic, and your decision.
Cnidarians
A phylum of animals that are more complex than sponges, characterized by their radial symmetry, a central gastrovascular cavity, and the presence of cnidocytes; includes jellyfish, corals, and sea anemones.
Spiracles
External respiratory openings found in some animals, such as insects and some amphibians, that allow air to enter and exit the trachea.
Tracheae
Tubes in the respiratory system that conduct air to and from the lungs.
Book Lungs
Respiratory organs found in certain arachnids, such as spiders and scorpions, consisting of stacked leaf-like structures used for gas exchange.
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