Researchers asked each child in a sample of 411 school-age children if they were more or less likely to purchase a lottery ticket ata store if lottery tickets were visible on the counter. The percentage that said that they were more likely to purchase a ticket bygrade level are as follows:Percentage that said theywere more likely to purchase632.8846.91075.01283.5Find the equation of the least-squares line, where y = percentage who said they were more likely to purchase and x = grade.(Give the answer to two decimal places.)ŷ =Grade

Data tableXYX⋅YX2Y2632.8196.8361075.84846.9375.2642199.611075.075010056251283.510021446972.25Sum…

Answered: Researchers asked each child in a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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c) Find the equation of the least - square line. d) Use the equation from part c to predict the maximum exercise heart rate for a person who is 72. e) Is the procedure in part d an example of interpolation or extrapolation? Given the bivariate data: 2 3 5 y 7 5 3 2 1 a. Draw a scatter diagram for the data. b. Find n,, and. c. Find a, the slope of the least-square line, and b, the y-intercept of the least-square line. d. Draw the least-square line on the scatter diagram from part a. e. Is the point (, ) on the least-square line? f. Use the equation of the least-square line to predict the value of y when x = 3.4. g. Find the nearest hundredth, the linear correlation coefficient.
more than others. To investigate, they measured the grey matter density in two regions of the brain that are known to be associated with social perception and memory. They also recorded the number of Facebook friend of each study subject. The scatterplot below shows the relationship between these two variables along with the least squares fit. Note that grey matter density has been reported as a standardized z-score for each individual. Do not round in intermediate calculations for this problem. Round your results to 4 decimal places except where indicated below. -2 -1 1 Grey Matter Density 002 009 00s 007 001 Facebook Friends
Tiffany is a manager who needs to fire the worst performing 3% of employees. At her organization, employee performance is a normally distributed variable. Tiffany should fire employees who have a performance score that correspond with a z-score less than or equal to _____
The multivariate analysis considers more than one factor of independent variables that influence the variability of dependent variables. a. True b. False
Which of the following individuals is likely to be excluded from a clinical trial? An individual with other diseases besides the disease of interest. An individual whose data is considered to be an outlier. An individual of who is considered to be a minority. An individual who will have difficulty complying trial protocols. bartleby expert answers x2 is D (an individual who will have difficulty complying trial protocols); however, other online resources are consistently indicating A is actually the correct answer (an individual with other diseases besides the disease of interest)...which is the correct answer and why? thanks
Students in an AP Statistics class wanted to determine if a person's hand span is associated with the number of candies he or she can pick up from a bowl of candy. For the fourteen students in the class, each student's hand span and the number of candies he or she was able to pick up was recorded. A least- squares analysis was conducted on the number of candies versus hand span. The conditions for inference were checked and deemed reasonable. The regression analysis output is given in the table below. Predictor Constant Coef -8.74 SE Coef 10.81 T -0.81 P 0.434 Hand span 1.26 0.52 2.44 0.031 S=3.34 R-Sq = 33.1% 39. The estimate of the slope of the least-squares regression line using a 95% confidence interval is (A) 1.26 ± 2.18(0.52) (B) 1.26 ± 2.44(0.52) (C) 1.26 ± 2.18 ( (0.521 (D) 1.26 ± 1.96(0.52) (E) 1.26 ± 3.34 (0.52) √14
Market Researchers have become more interested in the potential of social networking sites. Butthey need to understand the demographics of social networking users. A recent survey showed that22 of the 30 respondents who reported earning less than $30,000 per year said that they weresocial networking users. The mean salary of the 22 respondents was $21,500 with a standarddeviation of $200. On the other hand, 20 of the 30 respondents who reported earning more than$70,000 per year said that they were social networking users. The mean salary of the 20respondents was $90,000 with a standard deviation of $300. (a) Is there is enough evidence to infer that those who reported earning less than $30,000 per yearare more likely to be social networking users? Assume that the level of significance is 2.5%. (b) Estimate with 98% confidence the variance of salaries of the entire population of social networkusers earning more than $70,000 per year
College Graduation Rates. Data from the College Results Online website compared the 2011 graduation rate and median SAT score for 92 similar-sized public universities and colleges in the United States. The scatterplot below shows the relationship between these two variables along with the least squares fit. Round all calculated results to 4 decimal places. I ONLY need help with question 6.
Beachcomber Ltd in a local car dealership that sells used and new vehicles. The manager of the company wants to know how different variables affect the sales of his vehicles. A random sample of yearly data was taken with the view to testing the model: SALES=?+?AGE+?MIL+?ENG Where SALES= amount that a vehicle is sold for($000’s), AGE = age of the vehicle, MIL= the total mileage of the vehicle at the point of sale and ENG = the size of the engine. The sample of data was processed using MINITAB and the following is an extract of the output obtained: a) What is dependent and independent variables? b) Fully write out the regression equation c) Fill in the missing values ‘*’, ‘**’, and ‘***’.
Education Influences attitude and festyle. Differences in education are a big factor in the "generation gap." Is the younger generation really better educated? Large surveys of people age 65 and older were taken in n, = 37 U.S. cities. The sample mean for these cities showed that x, 25.2% of the older adults had attended college. Large surveys of young adults (age 25 - 34) were taken in a,- 32 U.S. attes. The sample mean for these aties showed that x, = 19.6% of the young adults had attended college. From previous studies, t is known that o, - 6.H% and o, 5.6%. Does this Information Indicate that the population mean percentage of young adults who attended college Is higher? Use a = D.05. (a) what is the level of signifcance? state the null and altemate hypotheses. O Hai H, = Hi H H, H O H, H,
Students in an AP Statistics class wanted to determine if a person's hand span is associated with the number of candies he or she can pick up from a bowl of candy. For the fourteen students in the class, each student's hand span and the number of candies he or she was able to pick up was recorded. A least- squares analysis was conducted on the number of candies versus hand span. The conditions for inference were checked and deemed reasonable. The regression analysis output is given in the table below. Predictor Constant Coef -8.74 SE Coef T P 10.81. -0.81 0.434 Hand span 1.26 0.52 2.44 0.031 S=3.34 R-Sq 33.1%
In an experiment, the purpose for manipulating the independent variable is to help? A. Establish the direction of the relationship by showing that the dependent variable changes when you manipulate the independent variable B. Ensure that any effects of selection or other randomization failures are minimized C. Establish the direction of the relationship and help eliminate the third variable problem D. Eliminate the third variable problem because you decide when to manipulate rather than waiting for the variable to change

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