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A researcher wants to know the average height of trees in a plot of land. The researcher randomly samples 18 trees, and finds that the average height is 4.7 meters with a standard deviation of 0.32 meters. Assume that the distribution of the heights of these trees are not strongly skewed and do not have any outliers. The researcher finds a 99% confidence interval for this sample is (4.481, 4.919). Select all that apply:: The margin of error is 0.217. The margin of error is 0.194. We are 99% confident that the true average height of the trees is between 4.481 and 4.919 meters. If we take many other samples from this population, 99% of them will have a sample mean that is between 4.481 and 4.919. The margin of error is 0.219. The margin of error is 0.192. There is a 99% chance that the true mean is 4.7 meters. If we took another sample of 18 trees, the sample mean would definitely be between 4.481 and 4.919 meters.
In a recent study of 86 working adults, the mean number of hours per week spent talking on the phone was 21.6. The sd= 5.7 hours.
A doctor knows from experience that 20% of the patients to whom he gives a high blood pressure drug will have undesirable side effects. Assume the doctor gives that drug to ten of his patients
Illustrate what was the lowest score earned on the exam. Explain how many students scored within 3 standard deviations of the mean.
the study obtained a measure to determine how comfortable the shopper was in a store. Higher scores indicated greater comfort. Suppose the following data were collected. Use a = .05 to test for differences among comfort levels for three types of b..
the following table shows the distribution of blood types in the general populationhoxworth blood center cincinnati
What is the probability that both defective lights will be found within three trials?
What is the probability density function for this uniform distribution?
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
Using goodness-of-fit test and.01 level of significance, find out whether accidents are evenly distributed all through the day. Write a short description of your conclusion.
At the end of class, our teacher said "If you're perceptive, you may have noticed that a regression analysis produced by the Excel Data Analysis ToolPak contains an ANOVA table.
Computing the probability values using normal distribution - Evaluate the percentage of homes that generate between 27 and 31 pounds of recycling per month.
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
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