Clifford likes dogs. he wondered how much dog owners spend on their dogs in a year. he hypothesized that dog owners spend more than $1000 a year on their dogs, on average. he sampled 75 dog owners in a local community and found that these 75 dog owners spent an average $1075 on their dogs in a year. suppose sigma subscript xequals$175. assume that these 75 dog owners are representative of all dog owners in terms of amount spent on their dogs in a year. which hypothesis test should be used?

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?