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Observers in Texas watched children at play in eight communities. Of the 814 children seen biking, roller skating, or skateboarding, only 14% wore a helmet.
a) Create and interpret a 95% confidence interval.
b) What concerns do you have about this study that might make your confidence interval unreliable?
c) Suppose we want to do this study again, picking various communities and locations at random, and hope to end up with a 98% confidence interval having a margin of error of ±4%. How many children must we observe?
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
In a semi-Markov process, let tij denote the conditional expected time that the process spends in state i given that the next state is j. (a) Present an equation relating μi to the tij .
Explain why we need to draw random samples and how such samples are drawn. What are the properties of a (simple) random sample?
how do i determine the total number of possible outcomes in of the nba finals best of seven series need to win 4 games
We can think of this as the value of mew that maximizes f(y), the probability that our observed value of y occurs.
A researcher collected sample data for 17 women ages 18 to 24 . The sample had a mean serum cholesterol level (measured in mg/100 mL) of 188.8 , with a standard deviation of 5.5.
A particular type of electronic component for use in PCs is mass produced and subject to quality control checks since it is known that 2% of all components produced in this way are defective.
Determine the standard score for the value x=452 realative to its sample, where the sample mean is 500 and the standard deviation is 32.
The average number of acres burned by forest and range fires in a large Wyoming county is 4,300 acres per year, with a standard deviation of 750 acres. The distribution of the number of acres burned is normal.
Use the contingency table you constructed in Module 2 to determine if there is evidence of a significant difference between proportions of males and females who enjoy shopping for clothing at the 0.01 level of significance.
What did the Court's ruling mean for Nancy Cruzan? Did the Court completely rule out the right of a terminally ill patient to terminate life-support systems? Explain.
Construct a relative frequency distribution for the 25 means. Compare this with the distribution prepared for Exercise 1.40 that is based on samples of n = 6 digits.
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