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Environmental credits.
An opinion poll asks an SRS of 500 adults whether they favor tax credits for companies that demonstrate a commitment to preserving the environment. Suppose that in fact 45% of the population favor this idea. What is the probability that more than half of the sample are in favor?
a committee of 8 consisting of 2 republicans 3 democrats and 3 independents is to be chosen from a group of 5
Is spine bone density is normally distributed in young women with a mean of 1.0 g/cm 2 and a standard deviation of .10 g/cm 2 , then how many young women out of 100 would you expect to have bone densities less than .85 g/cm 2 ?
Determining sample-size is important step when planning a statistical study. It is also quite a difficult task since many variables must be considered.
A researcher follows 200 women who exercise regularly and 300 women who do not exercise regularly. After 30 years of follow-up, 20 of the women in the exercise group are diagnosed with osteoporosis while 30 women in the non-exercise group are dia..
derive expression for a and b in terms of standard deviation of x and y mean of x and y and the correlation bw x and y.
In each sample, the proportion of people who voted in the last election is recorded. What can be concluded about the shape of the distribution of those sample proportions?
calculate the samplenbspcovariancenbspbetween two variables x and y using the formulas described in lecture or
An analyst working at BC Statistics is compiling a report on the use of the internet at home. In 1997, 250 randomly selected people were asked about the average amount of time spent on the internet per week.
An amplifier having Ri = 1M Ω, Ro = 1kΩ, and Avoc = -104 is operated with a 1-kΩ load. A source having a Thévenin resistance of 2 MΩ and an open-circuit voltage of 3 cos(200 πt) mV is connected to the input terminals. Determine the output voltage ..
Employee motivation and its related fields.
From experience he knows that he can go another 15 miles. What is the probability that he will be stranded on the highway without gasoline?
What is the probability that at least 8 of the next 15 errors are due to operator errors? What is the probability that no more than 3/10 failures are due to operators?
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