Answered: a)Using BEST-FIT SECOND-DEGREE CURVE,…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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The mean score and standard deviation of the test scores of students in Section 208 of a statistics course are 25.4 and 4.85 respectively while the mean score and standard deviation of the test scores of students in Section 209 in the course are 22.3 and 4.85 respectively. a) Which section did better on average? b) In which section are students scores less varied ?
A survey is conducted on 700 Californians older than 30 years of age. The study wants to obtain inference on the relationship between years of education and yearly income in dollars. The response variable is income in dollars and the explanatory variable is years of education. A simple linear regression model is fit, and the output from R is below: Im(formula = Income ~ Education, data = CA) Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 25200.25 1488.94 16.93 3.08e-10 *** Education 2905.35 112.61 25.80 1.49e-12 *** Residual standard error: 32400 on 698 degrees of freedom Multiple R-squared: 0.7602
Based on the box plot, what are the range and ther interquartile range?
In order to create more stems, create a split stem-and-leaf plot in which each stem is listed twice, with the leaves of the 0- 4 stem appearing on the top stem and leaves of 5-9 on the bottom stem. The stems are drawn below, with the first three data points entered in (You can create this stem-and-leaf plot right on your paper.) My example is not in order. Please rewrite the stem-and-leaf plot so that the values are chronological 1 1 2 0 2 8 3 3 3 4 Can you use this plot to find the median? Mode? Find them and explain how you can use this plot to find those values
9. a) How accurate do you think this estimate is? Explain. b) Will this trend continue forever? Why or why not? 10. Compare the two lines of best fit that you drew in this investigation. a) Was one easier to draw than the other? b) Was one a better model for the data than the other? Justify your answers. Please answer questions 1-10 thank you.
What is a point estimate in a confidnece interval for a t test?
Please use the information from question 4 to only answer question 5.
a) Is it possible for a standard deviation to be negative? Explain mathematically. b) What is the minimum standard deviation possible? c) Can standard deviation be greater than mean?
Eht///55BJPRC4rQHWKawiv2z PlohPZXNnCn4sJc6i79t9nMQ/edit $ scholarships Request 1) Marketing: Income What is the income distribution of super shoppers. In the following table, income units are given in thousands of dollars, and each interval goes up to but does not include the given high value. The midpoints are given to the nearest thousand dollars Income 5-15 15-25 25-35 35-45 45-55 55 and range more Midpoint, x 10 20 30 40 50 60 Percent of 21% 14% 22% 15% 20% 8% super shoppers a) Using the income midpoints, x and the percentage of super shoppers, do we have a valid probability distribution? Explain. b) Use a histogram to graph the probability distribution of part (a) c) Compute the expected incomepu of a super shopper. d) Compute the standard deviation o for the income of super shoppers. 2)The director of a health club conducted a survey and found that 23% of members used only the pool for workouts. Based on this information, what is the probability that, for a random sample of 10…

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a)Using BEST-FIT SECOND-DEGREE CURVE, what is A? b)Using BEST-FIT SECOND-DEGREE CURVE, what is B? c)Using BEST-FIT SECOND-DEGREE CURVE, what is C?