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Suppose the average cholesterol level of children ages 2-14 is 175 mg/dL with a standard deviation = 30 mg/dL. Recently, doctors have started worrying about elevated cholesterol levels in some children. A study was done to see if there is a familial aggregation of cholesterol levels. Specifically, in families where the father had a heart attack and has elevated cholesterol levels (> 250 mg.dL), is the cholesterol level of the children in such families higher than 175? A group of 100 such children had an average cholesterol level of 207.3 mg/dL. Assume there were no outliers in the data set. Use a standard deviation = 30 mg/dL and find a 99% confidence interval for the average cholesterol level of all children whose father has had a heart attack with cholesterol level above 250. (Please give responses to 3 decimal places)
We conclude that memory of food intake in the distant past is fair to poor." Explain to your audience why r=0.217 points to this conclusion.
This is a question pertaining to multivariate contingency analysis and partial correlation coefficientSet .05 as the significance level, what is the partial correlation coefficient and the t ratio?
assume the duration of human pregnancies can be described by a normal model with mean 266 days and standard deviation
1 a random sample of size 100 was taken from a population. a 94 confidence interval to estimate the mean of the
A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21. Develop an approximate 95% confidence interval for the population mean of the 600 employees.
Test to determine if there is a significant negative relationship between the independent and dependent variable at a = .05 and .01
for the following z-acoresm determine the percentage of scores that lie beyond z show workingstandard
an elevator in a building starts with 6 people and stops at 8 floors. assuming that all permutations of the passengers
A nationwide standardized test taken by high school juniors and seniors may or may not measure academic potential, but we can nonetheless examine the relationship bewteen scores on such test and performance in college.
The number of lightning strikes in a year at the top of a particular mountain has a Poisson distribution with a mean of 4.2. Find the probability that in a randomly selected year, the number of lightning strikes is 0.
It has been said that from the point of view of the general population, Type I errors are particularly undesirable. This has been used as a justification for setting alpha at such low levels as .05 and .01.
The class to get A's, 30% to bet B's, 30% to get C's, 15% to get D's and 10% F's. What would be the minimum and maximum scores required for each of these grades?
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