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The report "Undergraduate Students and Credit Cards in 2004: An Analysis of Usage Rates and Trends" (Nellie Mae, May 2005) estimated that 21% of undergraduates with credit cards pay them off each month and that the average outstanding balance on undergraduates' credit cards is $2169. These estimates were based on an online survey that was sent to 1260 students. Responses were received from 132 of these students. Is it reasonable to generalize the reported estimates to the population of all undergraduate students? Address at least two possible sources of bias in your answer.
the boston public school district has had difficulty maintaining on-time bus service for its students a year later
Let P(x) = xn + an-1xn-1 + an-2xn-2 + ··· + a1x + a0 and T:= 1 + max(0≤i≤n-1) |ai|. Find a bound on the roots of the polynomial P(x) = -7x4 + 2x3 - 3x2 + 4x +5 and relate it to the actual values of the roots
According to US Census Bureau, 7.1% of all births to non-smoking mothers are of low birth weight (
a particulate monitor has a power supply consisting of two batteries in parallel. either battery is adequate to operate
How would you approach identifying the two correct time series in #1 to the proceed to merge them into one and make a weekly estimate of attendance?
you are estimating the cost k of optical sensors based on the power output of the sensor. using the preliminary
If average size in square feet of homes built is 1810, determine maximum and minimum sizes of homes contractor must build. Suppose that standard deviations are 92 square feet.
Critique Graunt's method for estimating the population of London. What implicit assumption is he making?
How many participants need to be enrolled in each group to have a 90% chance of detecting a significant difference using a two sided test with α =0.05 if compliance is perfect?
In order to do so, they review 42 service calls and construct a 95% confidence interval for population mean: (2.468, 2.743). What can we conclude about the significance test of Ho: mu = 2.6 vs Ha: mu does not equal 2.6?
Suppose a simple random sample of size 57 is selected from a population with = 11. Find the value of the standard error of the mean in each of the following cases. The population size is infinite.
Compute the value of the test statistic (to 2 decimals).
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