Saturday
May 25, 2013

# Posts by jen

Total # Posts: 3154

statistics
what happens to the width of our confidence interval for mu if we increase the sample size but keep the confidence level the same ? a. it increases b. it stays the same c. it decreases d. it depends on the sample mean and standard deviation

statistics
according to the energy information administration (officially energy statics from the US Government) the mean price for one gallon of unleaded regular gas in the US cities for the year 2007 was 2.80 A random sample of 30 pumps in georgia yielded and average price of 284 per g...

statistics
a recent study suggests that the mean maximum temperature for the month of december in nyc is different from 41 degrees F. provide the null and alternative hypotheses for this test.

statistics
we are interested in testing at level of significance alpha =10 whether the population mean is different than 15. a random sample of size 25 is taken with a mean of 13.9. assume standard deviation is 2 and normally distributed population. find the values for zcrit

statistics
Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2 degrees F and a standard deviation of .62 degrees F. suppose we take a sample of eight healthy adults. what is the probability that their mean body temperature will be greater than 98.4

statistics
Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2 degrees F and a standard deviation of .62 degrees F. suppose we take a sample of eight healthy adults. what is the probability that their mean body temperature will be greater than 98.4

pre-algebra

geometry
(1)r y-axis °r x-axis (2)T 2,-3 °y=x (3)r y=-x °D 3 (4)R o °R o HELP!!

geometry
Which composition would produce an image triangle whose area is not equal to the area of the original triangle?

math
Suppose that fifteen observations are chosen at random from the pdf f_Y(y) = 3y^2, 0<=y<=1. Let X denote the number that lie in the interval (1/2, 1). Find E(X). E(X) is the expected value or average.

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