Standard deviation of the sample
A study found that the average time it took a person to find a new job was 3.5 months. If a sample of 30 job seekers was surveyed, find the 90% confidence interval of the mean. Assume the standard deviation of the sample is 0.5 month.
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A refrigerator has a coefficient of performance of 3. The ice tray compartment is at -20 C, and the room temperature is 22 C. The refrigerator can convert 30 g of water at 22 C to 30 g ice at -20 C each minute. What input power is required? Ignore
What percent reduction in heat loss would be mitigated by replacing a window contaning a single pane of glass with ( a) double pane low E insulating glass.
A car traveling east at 41.9 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 3.90 s. (a) What is the magnitude and direction of the car's acceleration as it slows down?
If the wall thickness is 50 mm, the inner surface temperature is 600 C, and the outer surface temperature is 75 C, calculate the heat loss from the furnace.
(a) What is the magnitude and direction of the car's acceleration as it slows down?
10.00mL of 1.98· 10-3 mol/L NaSCN solutionwere mixed with 10.00mL of 8.07· 10-4 mol/L iron(III) nitrate solution. When the reaction reached equilibrium, the absorbance measured at 447 nm was equal to 0.341.
Treat the coffee as though it were pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3
Calculate the required oxygen flow rate in mol/hr and the resulting mass fractions of methane and oxygen in the product stream.
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Do you think the increasing role of agencies in daily life improves the efficiency of government, or does it create unnecessary complexity?