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Hallux abducto valgus (call it HAV)is a deformation of the big toe that often requires surgery. Doctors used X-rays to measure the angle (in degrees) of deformity in 38 patients under the age of 21 who came to a medical center for surgery to correct HAV. The angle is a measure of the seriousness of the deformity. Here are the data
It is reasonable to regard these patients as a random sample of young patients who require HAV surgery.
(a) Construct a 95% confidence interval for the mean HAV angle in the population of all such patients.
(b) Construct a histogram and assess the shape, center, and spread. Remove the patient(s) that who are outliers.
(c) Construct a 95% confidence interval for the population mean based on the remaining patients after you drop the outlier(s).
(d) Compare your interval in (a) with your interval in (c). What is the most important effect of removing the outlier(s)?
The cholesterol concentration in the yolks of each of a sample of 22 randomly selected eggs laid by free range chickens were found to have a mean value of 9.38 mg/g of yolk and a standard deviation of 1.62 mg/g.
The managers in a company’s East and West regions were rated on the basis of the company’s evaluation system. A researcher wishes to conduct a t-test of means to determine if there is a difference between the East and West regions. Perform this calcu..
In studies examining the effect of humour on interpersonal attraction, McGee and Shevlin (2009) found that an individual's sense of humor had a significant effect on how the individual was perceived by others.
A state education agency designs and administers high school proficiency exams. Historically, time to complete the exam was an average of 120 minutes.
Which sessions, morning or afternoon, had more stable or uniform attendance over three-day period? Describe by using the suitable calculation for each data set and compare two calculations .
If Weight 1 is the weight (in pounds) of a random sample of five men who were accepted as models, and Weight 2 is the weight (in pounds) of a random sample of five men who were rejected as models, which of the following is the appropriate inferenc..
A nectarine-packing firm claims that the nectarines they ship have a mean weight of 5.22 ounces. A test on n = 10 randomly selected nectarines, gave the following results, in ounces:
Pedro wants to know if the weight loss of his group on the chocolate-only diet is representative of weight loss in a large population of middle aged men.
Let sales be the independent variable and earnings be the dependent variable. Draw a scatter plot. Compute the coefficient of correlation Compute the coefficient of determination.
For any distribution the score that separates the highest 10% from the rest of scores is called.
You can allow the cup to overfill 10% of the time. What amount should you set as the mean amount of coffee to be dispensed?
What is the number of replications for each of the main treatment factors and their interaction and what do you conclude from the overall ANOVA analysis
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