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December 9, 2013

Posts by tammy

Total # Posts: 595

statistics
You are designing a study to determine whether music has an effect on learning. Previous research indicates that the standard deviation to learn a task is 3.4 minutes. How many subjects would you need to ensure with 90% confidence that the estimate is within 1 minute of the tr...

statistics
For a normal distribution with a mean of 140 and a standard deviation of 55 find each value requested. a. What is the minimum score needed to be in the bottom 10% of the distribution? b. What scores form the boundaries for the middle 75% of the distribution.

College math
1.Find the height to the nearest foot of a tree that makes a 50-foot shadow when a 2 ft. 6 in. pole is used to make a shadow of 3 feet.

science
A ball of mass m is attached by two strings to a vertical rod. as shown above. The entire system rotates at constant angular velocity about the axis of the rod. a)Assuming is large enough to keep both strings taut, find the force each string exerts on the ball in terms of , m,...

Basic Statistics
Historically, the proportion of adults over the age of 24 who smoke has been estimated to be .30. You want to take a sample to estimate the current proportion of adults over the age of 24 who smoke within 3% at 95% accuracy. When you completed the sample you found that 114 of ...

Math
Solve for x: logx(121/64)= -2

college algebra
solve the logarithmic equation. Please show all work. log5x+log5(x-3)=log5(x+5)

college algebra
use properties of logarithms to find the exact value of the expression. sqrtlog81 3

college algebra
solve the equation below. Please show all work. log3(x/2-9)=4

Physical science
What is the force in newtons acting on a 5.7 kg package of nails that falls off a roof and is on its way to the ground?

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