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Question: Birds in the trees Researchers studied the behavior of birds that were searching for seeds and insects in an Oregon forest. In this forest, 54% of the trees were Douglas firs, 40% were ponderosa pines, and 6% were other types of trees. At a randomly selected time during the day, the researchers observed 156 red-breasted nuthatches: 70 were seen in Douglas firs, 79 in ponderosa pines, and 7 in other types of trees. Do these data provide convincing evidence that nuthatches prefer particular types of trees when they're searching for seeds and insects?
Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region. On the basis of regional sales, the total sales for the company can also be estimated.
Is the F-value for Levene's Test for Equality of Variances significant? What is the exact significance level? if the Levene's Test for Equality of Variances is significant, then equal variances cannot be assumed.
At the .05 significance level, can we conclude that the guideline is still reasonable?
A four-year financial project is forecast to have net cash inflows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project
Clearly explain the relationship between confidence level and the width of the confidence interval. Illustrate how changes in the confidence interval will affect the probability of an event occurring, please give examples.
a coin is known to be either fair corresponding to the null hypothesis h0 p12 or has heads on both sides corresponding
a drug is assumed to be e?ective with an unknown probability p. to estimate p the drug is given to n patients. it is
bill a psychologist has developed a new aptitude test. he was able to show that 80 of the public passed the test. a
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
Compute each of the variances, showing all your work. Be sure to indicate whether the variances are favorable or unfavorable - Direct materials price variance for iron
a salesperson of industrial chemicals has four customers in sacramento whom he might be able to visit on a 2-day trip
Sample surveys conducted in a large county in a certain year and again 20 years later showed that originally the average height of 400 ten-year-old boys was 53.8 inches with a standard deviation of 2.4 inches, whereas 20 years later the average he..
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