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A botanical researcher wishes to design a survey to estimate the number of birch trees in a study area. The study area has been divided into 1000 units or plots. From previous experience, the variance in the number of stems per plot is known to be approximately σ2 ≈ 45. Using simple random sampling, what sample size should be used to estimate the total number of trees in the study area to within 500 trees of the true value with 95% confidence? To within 1000 trees? To within 2000 trees?
If you plan to reject the first card offered, and to then accept the second card if and only if its value is greater than the value of the first card, what is the probability that you will accept the highest valued card?
The researcher wants to estimate the proportion who agree with a 0.03 margin of error with a 90% level of confidence. For this situation, the sample size of 389 is large enough.
according to an airline a particular flight is on time 95 of the time. suppose 10 flights are randomly selected and the
Choose any Markov Chain with a 3x3 transition matrix that is irreducible and aperiodic. The reason it needs to be irreducible and aperiodic is because we are looking for a Markov Chain that converges.
correlation and regressiondebate the following statement correlation means causation. determine whether this statement
Compute the test statistic. At 95% confidence using the p-value approach, test to see if taking the course actually increased scores on the driving exam.
Normal distribution with mean 1,200 hours, and standard deviation 70 hours. Determine the probability the mean life time of a random sample of 9 bulbs will be At least 1,180 hours.
A researcher is working with a group of participants, of whom are female and of whom are male. The researcher will select one participant from the group at random, and then she will select a second participant at random from the remaining particip..
What is the probability that the wait for the second student will be 15 minutes or less (to 4 decimals)? What is the probability that the wait for the second student will be between 15 and 45 minutes (to 4 decimals)?
a random sample of 10 parking meters in a beach community showed the following incomes for a day. assume the incomes
Hypothesis test of the claim has been conducted and that the conclusion of the test was to reject the null hypothesis. Identify the population to which the results of the test apply.
Conduct a global test of hypothesis to determine whether any of the regression coefficients are not zero. Use the .05 significance level
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