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A Rutgers University study released in 2002 found that many high school students cheat on tests. The researchers surveyed a random sample of 4500 high school students nationwide; 74% of them said they had cheated at least once.
a) Create a 90% confidence interval for the level of cheating among high school students. Don t forget to check the appropriate conditions.
b) Interpret your interval.
c) Explain what 90% confidence means.
d) Would a 95% confidence interval be wider or narrower? Explain without actually calculating the interval.
It is well known that the mean resting heart rate of adults is 71 beats/minute.- At α = .05, is there sufficient evidence to indicate that the true mean heart rate during laughter exceeds 71 beats/minute?
Give a direct proof that the sum an even integer and an odd integer is odd. Hint: Start by letting m be an even integer and letting n be an odd integer.
suppose that the distribution of keyboarding speeds for students who have completed a two- week keyboarding course is
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
Let"s consider the very large database of individual incomes from the Bureau of Labor Statistics as our population. It is strongly right skewed. How large a sample size?
Find the mean,median and mode of the data if possible, if any measure cannot be found or does not represent the center of data explain why. Please show work.
steeley associates inc. a property development firm purchased an old house near the lakeshore campus of humber college.
Traffic forecasters at the Minnesota Department of Transportation (MDOT) use regression analysis to estimate weekday peak-hour traffic volumes on existing and proposed roadways. In particular, they model y, the peak-hour volume (typically, the vol..
T-scores are used on some psychological tests, such as the MMPI. T-scores have a mean of 50 and a standard deviation of 10, and therefore a z-score of -1 (one standard deviation below the mean) would be converted to a T-score of 40.
Let Z1, Z2,... be iid random variables with density f . Suppose that P(Zi > 0) = 1 and that λ = limx↓0 f (x) > 0. Let Xn = n min{Z1,..., Zn}.Show that Xn """ Z where Z has an exponential distribution with mean 1/λ.
during each four-hour period the smalltown police force requires the following number of on-duty police officers eight
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
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