1) A poll is planned to determine what proportion of all students favor an increase in fees to support a new track and field stadium. A questionnaire will be published and the first 1000 completed questionnaires will be analyzed. Which of the following errors will be associated with the sample? A. Sampling errors and errors due to selection bias B.
Counting the number of patients who file malpractice suits after being discharged from hospitals in New York State. C. Calculating the amount of fly spray needed for your orchard next season. D. Calculating the mean number of fruit
Yes they should add to 1 because those are the only outcomes. b) Are the outcomes in the sample space or part (a) equally likely? No. The seeds are more likely to germinate. c) Use relative frequencies to estimate the probability that a seed will germinate.
Although the data are slightly right skewed, because of the large sample size(n=152) our inference on the mean is valid, by the Central Limit Therom. The Box Cox plot suggests a power transformation using a power, p= -0.5 would make the data more shaped like a normal distribution. The Normal Q-Q plot shows the transformed data points lying close to the straight line and the box plot of the transformed data looks symmetric with two outliers. The numerical summary of the transformed data confirms that the transformed data are symmetric (mean=1 and median=1). A Shapiro-Wilk test on the transformed data provides no evidence against the transformed data having come fro a normal distribution (P-value=0.4286).
False The F test assumes that the sampled populations are not normal. A. True B. False The F test for equality of two variances tests whether the ratio of the sample variances differ significantly from 1. A.
For what values of t will the null hypothesis not be rejected? a) To the left of -1.645 or to the right of 1.645 b) To the left of -1.345 or to the right of 1.345 c) Between -1.761 and 1.761 d) To the left of -1.282 or to the right of 1.282 2. Which of the following is a characteristic of the F distribution? a) Normally distributed b) Negatively skewed c) Equal to the t-distribution d) Positively skewed Complete Answers here QNT 561 3. For a chi-square test involving a contingency table, suppose the null hypothesis is rejected.
* Question 1 2 out of 2 points | | | Probability trees are used only to compute conditional probabilities. Answer | | | | | Selected Answer: | False | Correct Answer: | False | | | | | * Question 2 2 out of 2 points | | | Seventy two percent of all observations fall within 1 standard deviation of the mean if the data is normally distributed. Answer | | | | | Selected Answer: | False | Correct Answer: | False | | | | | * Question 3 2 out of 2 points | | | If two events are not mutually exclusive, then P(A or B) = P(A) + P(B) Answer | | | | | Selected Answer: | False | Correct Answer: | False | | | | | * Question 4 2 out of 2 points | | | The maximin approach involves choosing the alternative with the highest or lowest payoff. Answer | | | | | Selected Answer: | False | Correct Answer: | False | | | | | * Question 5 2 out of 2 points | | | Both maximin and minimin criteria are optimistic. Answer | | | | | Selected Answer: | False | Correct Answer: | False | | | | | * Question 6 2 out of 2 points | | | The Hurwicz criterion is a compromise between the maximax and maximin criteria.
Selected Answer: Expected Value of Perfect Information Question 12 In the Monte Carlo process, values for a random variable are generated by __________ a probability distribution. Selected Answer: Sampling from Question 13 Consider the following frequency of demand: If the simulation begins with 0.8102, the
According to the Central Limit Theorem, it will be bell shaped because it is normally distributed. We should not make any assumptions because the sample size is larger than 30 which conclude that all possible sample means are approximately normally distributed. Find the mean and the standard deviation of the sampling distribution of the sample mean x bar. Mean = 1/n x n x mean (x_1) = 20 Mean of sample means = 20 Standard deviation = x/n = 4⁄8= ½ Standard deviation of the sample means = ½ Calculate the probability that we will obtain a sample mean greater than 21; that is, calculate P(x bar>21). Hint: Find the z value corresponding to 21 by using μ_(x bar) and σ_(x bar) because we wish to calculate a probability about x bar.
None of these methods are new. This has been happening for more than a million years but at a very slow rate. Neighbors that grow any kind of citrus tree pass it on from tree to tree just like it would be in the vineyards. Having to deal with this problem of these invasive species it is costing the state of California at least $3 billion dollars a year. According to California Invasive Plant Council for Spring 2009 says that weeds alone cost California $82 million a year and that also suggest that invasive species has cost the United States $138 billion.