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Question: Strong association but no correlation The gas mileage of an automobile first increases and then decreases as the speed increases. Suppose that this relationship is very regular, as shown by the following data on speed (miles per hour) and mileage (miles per gallon).
(a) Make a scatterplot to show the relationship between speed and mileage.
(b) Calculate the correlation for these data by hand or using technology.
(c) Explain why the correlation has the value found in part
(b) even though there is a strong relationship between speed and mileage.
Physical Sciences The well depth in certain locations is important for agriculture and for the development and maintenance of residential and commercial areas.
in the normal model n10016 for iqs what cutoff values bound the middle 80 of all iqs?a79.50 and 120.50b86.53 and
Suppose that instead of trying to maximize their expected profits, the store wanted to be 95% sure that they have enough milk to satisfy demand. How much milk should they order?
She therefore asks you to calculate a correlation coefficient for sales of the current week against amount of advertising spent in the previous week.
Conduct a goodness-of-fit test to determine whether any of the true population proportions differs from the hypothesized proportion. Use a = 0.05.
If she serves 6 times, what is the probability she gets all 6 serves in?- exactly 4 serves in?- at least 4 serves in?- no more than 4 serves in?
Hypertensive experimental (n=100) is 14%, placebo (n=100) is 22%. Generate a 95% Confidence interval for difference in proportions of patients with hypertension between groups.
Find the length of the longest run in your 50 trials. Combine your value with those of the other students in your class in a dot plot.
Describe the mean difference that is the main effect for the treatment. Describe the mean difference that is the main effect for gender. Is there an interaction between gender and treatment? Explain the answer
if a manager believes that the required sample size is too large for a situation in which she desires to estimate the
A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately describes the measures of central tendency?
How large a sample of workers should she take if she wishes to estimate the mean assembly time to within 20 seconds? Assume that the confi- dence level is to be 99%.
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