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Israel's kibbutzim are by now well diversified beyond their agrarian roots, producing everything from lollipops to plastic pipe. These 282 widely scattered communes of several hundred members maintain hundreds of factories and other production facilities. An economist wants to estimate the average annual revenues of all kibbutz production facilities. Since each kibbutz has several production units, and since travel and other costs are high, the economist wants to consider a sample of 15 randomly chosen kibbutzim and find the annual revenues of all production units in the selected kibbutzim. From these data, the economist hopes to estimate the average annual revenue per production unit in all 282 kibbutzim. The sample results are as follows:
From these data, compute the cluster sampling estimate of the mean annual revenue of all kibbutzim production units, and give a 95% confidence interval for the mean.
Two 10-cm-diameter charged rings face each other, 18cm apart. The left ring is charged to -30nC and the right ring is charged to +30nC. What is the magnitude of the electric field at the midpoint between the two rings
What is the number of turns on the coil and what is the magnetic field at the mean radius?
Yusef pushes a chair of mass = 51.0 across a carpeted floor with a force (the subscript 'p' here is lowercase and throughout the question) of magnitude = 170 directed at = 35.0 below the horizontal. The magnitude of the frictional force between the c..
A 95 N force exerted at the end of a 0.69 m long torque wrench gives rise to a torque of 15 Nm. What is the angle (assumed to be less than 90o) between the wrench handle and the direction of the applied force?
the conductivity of tungsten at room temperature s 1.8 107 am2vm is significantly smaller than that of copper. at the
The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.315 m and mass 4.89 kg, what should the radius of the disk be
Calculate the magnitude of the torque (due to the force of gravity) around this pivot point when the string makes a 45º angle with the vertical. The acceleration of gravity is 9.81 m/s 2.
The 5*10^6 solar mass black hole at the center of the galaxy may have gained its first million solar masses in the first billion years of the milky ways existence. How much mass must it have absorbed on average each year since then to reach 5 million..
A 3.00-kg crate slides down a ramp. The ramp is 1.00 m in length and inclined at an angle of 30.0o. The crate starts from rest at the top, What is the speed of the crate at the bottom of this new ramp
Our sun has a surface temperature of 6000oK. The star Antares has a surface temperature of 3400oK and a diameter 300 times greater than our Sun. Find to which group of stars does Antares belong, and why
a layer of water covers a slab of material X in a beaker. A ray of light traveling upwards follows the path indicated. Find the angle the light makes with the normal in the air
To recharge a 12 V battery, a battery charger must move 3.6 x 10^5 C of charge from the negative terminal to the positive terminal. How much work is done by the charger
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