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1. An observational study is conducted to investigate the association between age and total serum cholesterol. The correlation is estimated at r = 0.35. The study involves n=125 participants and the mean (std dev) age is 44.3 (10.0) years with an age range of 35 to 55 years, and mean (std dev) total cholesterol is 202.8 (38.4).
a) Estimate the equation of the line that best describes the association between age (as the independent variable) and total serum cholesterol.
b) Estimate the total serum cholesterol for a 50-year old person.
c) Estimate the total serum cholesterol for a 70-year old person.
If a person were to guess a number from 1-10, the chance of guessing a 4 would be 0.1. If 5 people were asked to guess a number from 1-10, the chance of guessing a 4 would be 0.5. The chance of 2 people guessing a 4 would be (0.1)(01.)=(0.01), correc..
Discuss which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis.
1. do this exercise by hand. a famous brand-name manufacturer wants to know whether people prefer nibbles or wribbles.
name the scale of measurement that applies to each of the following situationsa. james hall in 68.5 feet tall-b. a
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. Check the normality assumption.
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents?
a random sample of 100 credit sales in a department store showed an average sale of 120.00. from past data it is known
(a) Set up a 99% confidence interval estimate of the true population average amount of paint included in a five-litre can. (Use the z-table.) (b) Based on the results of (a), do you think that the store owner has a right to complain to the manufact..
according to the world factbook 2004 the total fertility rate estimated mean number of children born per woman for
Calculate, the expected demand and the standard deviation of the demand for each wine and calculate the expected profit for each wine.
A sample consists of the following n =7 scores: 5, 0, 4, 5, 1, 2, and 4- Compute the mean and standard deviation for the sample.
Complete the test at the 5% level of significance.
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