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A doctor wants to determine the relation that might exist between a child's height and head circumference. She randomly selects 11 three-year-old children and measures their height and head circumference and obtains the data.
Height (inches) Head Circumference27.75 17.524.5 17.125.5 17.126 17.325 16.927.75 17.626.5 17.327 17.526.75 17.326.75 17.527.5 17.5
If the doctor wants to use height to predict head circumference run a linear regression on the data.
a) Find the r-value and comment about it.b) Is the r-value significant at 99%?C) Write the equation for the best-fit lie.d) If height was 24, what would be the head circumference?e) Make a general statement about the results.
Restaurateur Danny Valentine is evaluating two, sites, Raymondville and Rosenber, for his next restaurant. Denny suspects that Raymondville residents (population 1) dine out more often (number of times per month) than Rosenberg residents (populati..
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
The prices (in dollars) for a sample of roundtrip flights from Chicago, Illinois to Cancun, Mexico are listed. Find the mean, median, mode, range, Q1, Q2, variance, and standard deviation of the flight prices.
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
The overall average for the samples is 17 ounces. The range is only 0.5 ounce. Determine the upper and lower control-chart limits for averages for the boxes of cereal.
The frequency distribution below was constructed from data collected from a group of 25 students. Construct a relative frequency distribution.
Describe your answer to a person who has never had a course in statistics.
You may assume the sample data comes from a population that follows a normal distribution. Using a .05 level of significance test the company's claim.
Let X and Y have a bivariate normal distribution with parameters u1 = 20, u2 = 40, sigma1^2 = 9, sigma2^2 = 4, and p = 0.6. Find the shortest interval for which 0.90 is the conditional probability that Y is in the interval, given that X = 22.
Using the data file below, construct a histogram and a frequency polygon. Describe the shape of this distribution.
Employer wishes to interview only those applicants who score in top 15%. What must cut-off score be for interviews?
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