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What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
Retired workers and disabled workers both receive Social Security benefits. What information would we need to test the claim that the difference in monthly benefits between the two groups is greater than $30 at the 0.05 level of significance?
Write out the hypotheses and explain the testing procedure.
if 150 grams of water at 30 degrees celsius are mixed with 200 grams of water at 100 degrees celsius, what is the final temperature of the water?
an arrow is shot into the air. it's function h= 128t-16^2 find it average velocity of the arrow over the intervals from 2 seconds to 3 seconds
The perimeter of a swimming pool is 91m. The width is 5m more than half the length of the pool. Find the length and width of the pool.
evaluate the steady-state concentration.under some conditions the rate at which the concentration of a dissolved
A farmer has a rectangular garden plot surrounded by 200 ft of fence. Find the length and width of the garden if its area is 1275 ft2.
PizzaThe probability that a customer selects a pizza with mushrooms or pepperoni is 0.43, and the probability that the customer selects only mushrooms is 0.32. If the probability that he or she selects only pepperoni is 0.17, find the probability ..
the governor of a large northeastern state is trying to decide whether to veto a bill that she opposes that has been
the amount of plutonium remaining from 1 kilogram after x years is given by the functionwx2nbspnbspnbspnbsp -x24360a.
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
1. Based on how you want to live in retirement and any other sources of retirement income you have available, how much money do you think you will need to draw from this savings account each year during retirement?
A plane travels 160 miles on a bearing of N 50° E and then changes its course to N 67° E and travels another 160 miles. Find the total distance traveled north and the total distance traveled east.
a hundred squash balls are tested by dropping from a height of 100 inches and measuring the height of the bounce. a
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