The flow of water through soil depends on the porosity of the soli which is assumed...

The flow of water through soil depends on the porosity of the soli which is assumed to be normally distributed. To compare two types of sandy soil n1=16 measurements are to be taken on the porosity of soil A and n2=21 measurements are to be taken on soil B Assume that the two sample variances S12= 0.01, S22= 0.02.

(a) construct a 95% confidence interval for ratio of variances (variance2/variance1). Is there any evidence that two population variances are qual.

(b) Find the probability that the difference between the sample means will be within 0.005 units of the difference between the population means. Use the result in (a) to decide whether a pooled variance should be used.

(c)If \overline{X} - \overline{Y}=0.03 . Construct 95% confidence interval for difference of population means. Use the results in (a) to decide whether a polled variance should be used.

Expert Solution

orchestra answered 1 year ago

A soil has a natural water content of 10%, specific gravity of 2.65, and porosity of...

A soil has a natural water content of 10%, specific gravity of 2.65, and porosity of 0.45. a) Find the dry unit weight and degree of saturation. b) If the optimum water content for the soil from a standard proctor was 20%, how much water would have to be added to 1m^3 of the soil to increase the water content to an optimum level?

Communication by the nervous system depends on the flow of information through chains of neurons that...

Communication by the nervous system depends on the flow of information through chains of neurons that are functionally connected by synapses. The most common synapse in the human body is the chemical synapse. Define chemical synapse. 3 points Describe the chain of events that occur at a chemical synapse. (HINT: Your answer should begin with an action potential arriving at an axon terminal.) 5 points What events account for the synaptic delay? 2 points Give one example of a chemical...

1. Describe the path followed by water from the soil, through the plant and into the...

1. Describe the path followed by water from the soil, through the plant and into the atmosphere. Where in the path are the important resistances to water movement? 2. What is meant by the term "active transport"? What is the difference between "primary" and "secondary" active transport? 3. Both membrane channels and carriers show changes in protein conformation. What is the role of such conformation changes (a) in channels, and (b) in carriers?

Water flows through a three-soil system placed in a 10 cm-wide square tube. Soil layers are...

Water flows through a three-soil system placed in a 10 cm-wide square tube. Soil layers are described as follows: Soil Thickness (cm) K (cm/sec) A 2 0.1 B 1 0.002 C 7 0.0006 Calculated the discharge (q) through each soil and through the system when water flows: 1- Parallel to layering (take head difference = 80 cm and length of all layers = 200 cm). 2- Perpendicular to layering (take head difference = 9 cm) - In case 2, what...

Explain the 3 hypotheses for the flow of water through a stem

Which assumed inventory cost flow method: usually parallels the actual physical flow of merchandise? divides cost...

Which assumed inventory cost flow method: usually parallels the actual physical flow of merchandise? divides cost of goods available for sale by total units available for sale to determine a unit cost? assumes that the latest units purchased are the first to be sold?

A Rankine cycle uses water as its working fluid. The mass flow rate of water through...

A Rankine cycle uses water as its working fluid. The mass flow rate of water through the cycle is 150 kg/s. Superheated vapour exits the boiler at 8 MPa and 560 °C. The condenser pressure is 8 kPa. The water at the pump inlet is 35 °C. The isentropic efficiency of the pump is 75% and the isentropic efficiency of the turbine is 91%. The turbine and pump can be treated as adiabatic. The pressure drops of the working fluid...

: How the presence of water in soil affects the property of soil and its load-carrying...

: How the presence of water in soil affects the property of soil and its load-carrying capacity? Also, mention how the seasonal variation of the water content of soil will affect the settlement characteristics of the foundation?

Which would be the best emulsifier of soil if soft water (no Ca2+ ions, Mg2+ ions,...

Which would be the best emulsifier of soil if soft water (no Ca2+ ions, Mg2+ ions, and so on) were used? a. A soap. b. A detergent. c. Both would be about the same. Explain your answer: ________________________________

For the money demand function, we assumed that money demand depends on income and interest rate....

For the money demand function, we assumed that money demand depends on income and interest rate. Consider an economy where money demand does not depend on income and is only a function of interest rate. Md = L(i) Suppose that the economy is open and on a flexible exchange rate: (a) Draw the money demand and supply curves with money demand and supply on x-axis and interest rate on y-axis. (b) Show what happens to money demand and supply curves...

Question